Powerhouse Museum Complex

Item details

Name of item: Powerhouse Museum Complex
Other name/s: Ultimo Power House, Ultimo Power Station; Ultimo Tramsheds, Ultimo Tram Depot, Harwood Building, Ultimo Post Office, Powerhouse Museum, Wran Building
Type of item: Complex / Group
Group/Collection: Recreation and Entertainment
Category: Art Gallery/ Museum
Primary address: 494 - 500 Harris Street, Ultimo, NSW 2007
Parish: St Andrew
County: Cumberland
Local govt. area: Sydney
Local Aboriginal Land Council: Metropolitan
Property description
Lot/Volume CodeLot/Volume NumberSection NumberPlan/Folio CodePlan/Folio Number
LOT3 DP216854
LOT1 DP631345
LOT3 DP631345
LOT1 DP770031
LOT1 DP781732
LOT37 DP822345

Boundary:

A place which comprises19th century industrial buildings, post office and late 20th century museum buildings and courtyards which form a cohesive museum complex, connected visually and spatially.
All addresses
Street AddressSuburb/townLGAParishCountyType
494 - 500 Harris StreetUltimoSydneySt AndrewCumberlandPrimary Address
Macarthur StreetUltimoSydney  Alternate Address
Omnibus LaneUltimoSydney  Alternate Address

Statement of significance:

The Powerhouse Museum Complex has State heritage significance for innovative approaches to power generation and museology in NSW history. Ultimo Power House (former) is of State historic, aesthetic, and technical heritage significance as the first large state-owned electricity generating station in NSW. Its adaptive reuse as the Powerhouse Museum in 1981 and 1988, including the Harwood and Wran buildings (respectively), has State historic, social, and associative significance. As part of the Museum of Applied Arts and Sciences, it has a long association with NSW technical education and industry. Aboriginal people express the ongoing social significance of the place, including as a potential source of pre and early contact information and as a marker of 1980s protests by Aboriginal people.

The change in use to major public museum has State historic significance as a central part of the 1988 Bicentenary projects. The Bicentenary was a significant event in NSW and Australian history engaging much of NSW's population and ushering in new national self-confidence. It also raised important questions about colonisation, including its impacts on Aboriginal people such as dispossession, violence and intergenerational disadvantage. The complex in 1988 was considered at the time to be a highly innovative design, producing a state-of-the-art museum by world standards.

The conversion to a museum has State historic and social significance for its role in the wider heritage conservation movement as a lauded, highly influential early example of adaptive reuse of industrial heritage, nationally and internationally. Ongoing upgrades of fabric and fixtures for museum use reflect changing requirements over time in response to contemporary museum standards and for the museum to exercise the functions and activities of the Museum of Applied Arts and Sciences Act 1945.

Individual buildings including the Ultimo Power House (former), Ultimo Tram Shed (or Harwood building) and Ultimo Post Office (former) have State significance beyond their individual architectural styles and histories, for their contribution since the 1980s to supporting the museum function.

The contribution of the purpose-built Wran building, with its distinctive roof form (comprising two arches), and general scale, characterises the architectural influence of the 1988 museum redevelopment. Together with the complex it has State significance for its associations with political, design and museum figures including Neville Wran, Jack Ferguson, Lionel Glendenning, Richard Johnson, Lindsay Sharp and Norman Harwood.

The Powerhouse Museum Complex has State social significance for people across Sydney, NSW, and Australia for whom it represents an important educational and cultural institution and tourist destination. Its changing use from power station to cultural institution and ongoing evolution to support museum exhibition, programs and operations offers insights into technological change, development, and urban renewal in NSW.
Date significance updated: 02 Apr 25
Note: The State Heritage Inventory provides information about heritage items listed by local and State government agencies. The State Heritage Inventory is continually being updated by local and State agencies as new information becomes available. Read the Department of Premier and Cabinet copyright and disclaimer.

Description

Designer/Maker: NSW Railway Commissioners (Power House complex); NSW Dp't. of Public Works, L. Glendenning (PHM)
Builder/Maker: J. Stewart and Co. Sydney (Power House complex)
Construction years: 1897-1987
Physical description: The Powerhouse Museum Complex principally comprises:
1.Office Building
2.Turbine Hall
3.Engine Room
4.Switch House
5. Second Boiler House
6.Water Cooling System and Manifold
7.West (Wran) Building
8.The Harris Street Courtyard
9.Grace Bros/ Level 1 Courtyard
10.Ultimo Tramshed/ Tram Depot (later, Harwood Building)

Of the above buildings the (former) Ultimo Power House comprises:
1.Office Building
2.Turbine Hall
3.Engine Room
4.Switch House
5. Second Boiler House

Adapted to house the Powerhouse Museum, these buildings have undergone ongoing change to support the evolving needs of the museum function. The building envelopes are generally intact, with varying degrees of intervention for the museum in 1988 (such as, but not limited to new openings for lift shafts, entrances, bricked in windows, rooftop additions) but much of the internal fittings and fixtures have been removed.

OFFICE BUILDING
The Office Building (also referred to as the North Annex) is a three storey symmetrical building, 30m wide and 14m deep, with seven bays, built in a simplified Italian Renaissance Classical style. It faces William Henry Street and is partly obscured by the William Henry Street Bridge. The rusticated stone base supports a stone plinth on which sits the brick superstructure. The articulation continues in the form of brick pilasters with a sandstone entablature, above which is a brick parapet. On the ground floor, window mullions are in the form of classical pilasters, while on the top floor they are plain. Beneath each window is a spandrel infilled with bricks in herringbone pattern. The principal facade is in the form of an aedicule two stories high, with large-scale stone pilasters on stone pedestals, surmounted by a pediment. Within the frontispiece is an entrance having semicircular arch with a console keystone. The principal feature in the aedicule is the spandrel which identifies the building's ownership as the New South Wales Government Transport Department (NSWGTD). Surrounding the name of the building is a band of lightning bolts, a stylised representation of electricity, which passes behind a decorated floriated crest incorporating the Southern Cross. The spandrel was once surmounted by a leadlight window which bore the State Coat of Arms. On the top floor, each pair of pilasters, on the east and west ends, is gathered over a semi-circular opening which makes the semi-circular arched windows appear recessed.

The building has a distinguished architectural composition shown in brickwork, windows and facades. The bricks are very fine plastic-moulded and have a warm red-brown colour and pointed with a light red-brown mortar. The work throughout is English bond except in the spandrels where it is herringboned. The robust cedar window joinery is very fine and is consistent with the time of building. The repetition of the pilasters, spandrels and windows on the north, east, and west facades adds to the careful ornamentation of the building. All that remains of the old boiler house on the eastern side of the Office Building is the remains of the first chimney stack and the flashing outline of the gable roof in the brickwork of the second boiler house.

As part of the 1980s adaptive reuse works undertaken to the building, the original spiral staircase was removed and the basement area was opened up to allow installation of a wider modern staircase to connect all levels of the building. (Curio, 2022,130).

THE ENGINE ROOM
Contemporaneous with the Office Building but different in concept and design is the Engine Room. It is approximately 30m wide and 30m deep and is, in effect, an extension of the Office Building. The bricks, still laid in English bond, are brown-grey and the character of the building is much more utilitarian. The pilasters are strengthening devices and divide the west front (the building's only facade) into five bays with paired windows. The openings of the metal framed windows are segmental-arched and each brick sill runs the length of the window only and not the length of the bay, as on the office building. The facade is completed by a parapet which conceals the box guttering. Beneath the parapet is a double stringcourse of brickwork.
Initially it comprised four reciprocating steam engines driving 850 kW direct current generators. Alternating current generators operating at 25 cycles were added from 1902 and turboalternators from 1905. The state's first pulverized coal fired boilers were commissioned here in 1923. By 1942 the station's capacity had grown to 79.5 megawatts (Engineers Australia citation).

The Engine Room retains many features; the overhead Case travelling gantry cranes remain intact and in place; the white wall tiles were retained, and the floor was finished with tiles carefully matched to the originals; a hole in the eastern wall remains where a pipe carried steam from the Boiler House, and nearby there is a counter-weighted mechanism on the wall that once supported the pipe; the spherical glass light shades are reproductions of those seen in early photographs of the room; the switchboard gallery on the northern wall is mostly original, including one of two staircases and the cast-iron columns with decorative brackets that support the cast-iron floor plates; the other staircase and the wooden balustrades are reproductions. These remaining features inform how the space operated. The viewing window from the Switch House, which allowed control staff to keep watch over the generating equipment, is still in place.

The tall, roof-high stumps of two of the three brick chimneys are still in place (the upper parts having been demolished before the museum project was proposed) and in excellent condition, towering over the Boiler House; one is used as part of the museum's air- conditioning system, and the other houses stairs that allow access to the roof.

The Engine Room retains many features, and its ambience was recreated by using it to house working steam engines, some of them powering other machines.

THE TURBINE HALL
The Turbine Hall, an extension eastwards of the Engine Room, is a very simple, very strong expression of the utilitarian architecture of the early 20th century and one of the prime large examples of Edwardian industrial architecture in Sydney. Its size, 56m x 31m, reflects the size of the turbo alternators it was designed to house. The facade is divided into eight bays, which are further proportioned by a horizontal band which divides the facade into sixteen elements. The west facade's principal quality is its sheer scale which is enhanced by very carefully controlled simplicity. Emphasising the main articulation of the facade is a moulded stone stringcourse at the sill level of the upper windows and a moulded stone cornice capping the top of the parapet. The main elements are the very tall, semi-circular headed windows.

These main windows have stone sills and the window bays, flanked by pilasters, terminate in stepped brick corbels and are surmounted by a stone gable cornice.

The overhead Goninans of Newcastle 1929 gantry crane that served the Turbine Hall is still in place, complete with the high-level rails along which it ran.

THE SWITCH HOUSE
The Switch House is a brick building, three stories on the east and two stories above ground level on the west. Only one storey of the Switch House is visible from Harris Street due to the location of the Harris Street Courtyard. The west facade is divided into seven bays, the northernmost of which is given emphasis by means of a dentillated gable which incorporates a centrally-placed circular motif with herringbone infill. The remainder of the building features a dentillated segmented extension of the parapet. The brickwork between each pair of windows extends even higher and terminates in dentillated bracketed caps. All dressings, sills, lintels and caps are of rendered concrete.
The viewing window from the Switch House, which allowed control staff to keep watch over the generating equipment, is still in place. Decorative stonework and brickwork on the on the Switch House are still in very good condition.

SECOND BOILER HOUSE
The Second Boiler House is the largest building in the complex, 83m long and 23m wide, and has the largest continuous facade to the east. The three tiers of windows, arranged in thirteen bays, are a vigorous architectural solution to the problem of dealing with a very tall facade. The height from string course to plinth is much greater than on the west facade of the Turbine Hall, which it complements. The thirteen bays are evident on the top tier of the building, above the string course. Below that, the fourth and fifth bays from the north end were combined to form a tripartite entrance bay, which allowed access to rail trucks on the east siding. The south facade of the Boiler House, although abutting the Turbine Hall and matching it in size, was created somewhat differently, preserving the individuality of the building. The pilasters, their terminations in stepped corbels and the gable cornices are the same but the windows are smaller, arranged in two tiers and segmental-headed, as on the east facade.
The tall, roof-high stumps of two of the three brick chimneys are still in place (the upper parts having been demolished before the museum project was proposed) and in excellent condition, towering over the Boiler House. One is used as part of the museum's air- conditioning system, and the other houses stairs that allow access to the roof.

THE WATER COOLING SYSTEM AND MANIFOLD
The Water Cooling System and Manifold were an integral component of the power station. The system is underground and is not visible. Underground conduits possibly built of sandstone taking cool water to the Power House from Darling Harbour waters edge and hot water from the Powerhouse to the waters edge. Remains of the engineering equipment / manifold of this cooling system are located in the carpark of the Novotel accessed from Murray Street.

Two of the underground tunnels are still in use as part of the Powerhouse Museum's air-conditioning system.

THE WEST (later WRAN) BUILDING (POWERHOUSE MUSEUM)(opened, 1988):
Runs along (predominantly fronts) Harris Street, to the corner of William Henry and Harris Streets, representing the Powerhouse Museum's formal entry, which is currently made through the Galleria on (its) level 3. The double curved roof form of the building is the most prominent component of the landscape when viewed from nearby Harris, Systrum, Macarthur and William Henry Streets (Curio Projects, 2022, 289).

Purpose designed and built for opening in 1988 to house the Powerhouse Museum (as its entry and circulation space) and become the new home of the Museum of Applied Arts and Sciences (MAAS)(ibid, 2022, 286).

Comprised (when built) two vaulted spaces - Vault 1 (the Galleria) and Vault 2 (ibid, 2022, 289). Lionel Glendenning's barrel vaulted design responded to 'the golden mean proportion' of the Turbine Hall, with Vault 1 (of the Wran building) making architectural reference to MAAS's first home in the 1879 Garden Palace (Sydney's International Exhibition), and (Wran Building's) Vault 2 referring to the arches of the Boiler House (ibid, 2022, 286).

HARRIS STREET / ENTRANCE COURTYARD (1988):
Opening in 1988 and remodelled in 2011/12, the wide paved forecourt is accessed from Harris Street. Paved in brick, it has two levels. The lower and much larger level provides access to the main entry which enters into Vault 1 of the Wran building. The second level provides access to the Museum cafe and the shop and is also the main public exit. A ramp and stairs connects the two levels of the terrace.

Having been modified extensively, the fabric of the Harris Street/ Entrance Courtyard is not considered to be of state significance.

GRACE BROS. / LEVEL 1 COURTYARD (1988):
The level 1 Courtyard (formerly the Grace Bros. Courtyard) was added at the same time as the Wran Building. It currently exists as a 'rear courtyard' for the site. At present it houses a rectangular box-like cafe (although cafe operations ceased in 2020), a children's playground and a Utility substation surface entrance. Within it are the colourful (blue and red) 1988 external stair and lift shaft of the Boiler House which were designed to interpret the former coal chutes, ash handling plant and coal handling plant of the former Power House. Remnant bricks from where the Goods Line (Darling Harbour Rail Corridor) used to extend into the Boiler House are evident (ibid, 2022, 290).

The fabric of the Grace Bros/ Level 1 Courtyard is not considered to be of state significance.


ULTIMO TRAMSHED / TRAM DEPOT (later, HARWOOD BUILDING):
The Harwood Building was converted in the early 1980s to house offices, conservation labs, collection storage and exhibition space for the Powerhouse, opening in 1981. Its roof was reclad in new metal, reproducing the original saw-tooth form. The southern facade is now glazed in steel-framing, with central entry doors. The basement was redeveloped for the climate-controlled storage of objects and archives. It now houses workshops, conservation laboratories, a photography studio, library and offices.

The Harwood Building today is a modern adaption of the former Ultimo Tram Depot. The remnant fabric of the building has been heavily modified, reconstructed and adaptively reused to such an extent that very little original fabric remains. Of the building fabric, only one wall and two half-walls remain unaltered. Of the entrances, tracks, pits and ancillary structures, only sections of the pit side walls and end walls; and short sections of steel tram tracks with sections of sleeper remain in a difficult to access section of the basement beneath the new slab of Stage 1.21 The Harwood Building has undergone far more intervention in its fabric than any other building. (Curio, 2022:107).

ULTIMO POST OFFICE (former)
The Ultimo Post Office (former) is a single storey face brick building with ashlar and moulded stone dressings and slate clad roof. The Harris Street (western) end has a parapeted gable with stone coping finishing in segmental shoulders and topped with a frustum apex stone. On the gable is a quarry faced frieze above a chink with a stone sill. At the eastern end the roof is of gabled hip form (AHC, 1984).

Its windows are mainly double hung sashes with (coloured) highlights above. A major feature is the stone arched, recessed main public entry porch on the corner. It is double faceted with ornate impost mouldings and archivolts. Above it is an embellished cartouche, with a high quality of work and craftsmanship. The fireplace in the main room appears to be original. 1955 images suggest the original floor was of wooden boards (ibid, 2/2024).

The eastern section (lower than the rest) was originally postmaster's residence. The former entrance here is flanked by oculi each with stone reveal and label mould. This elevation continues easterly as a stepped brick wall (with stone coping) to the back yard. A corbelled chimney with two pots rises from the roof of the building. The building reflects Federation Classical and Federation Romanesque design, elements of the latter in parapeted gable, large semicircular opening in porch and simple massing. It is on a major intersection and a key streetscape element (ibid, 1984).
Physical condition and/or
Archaeological potential:
The former Ultimo Power House complex has been substantially altered since its historic use and was a derelict asset open to the sky when acquired and transformed into the MAAS in 1988. After the closure in 1964 the main heritage brick buildings, including the Boiler Room and Turbine Hall, were largely stripped of remaining equipment and all associated moveable heritage elements, with new floors laid, roofing elements, and demolition of significant core elements (such as the Boiler Room chimneys in 1977), reducing the aesthetic appearance of the precinct.

The remaining features, including overhead gantry cranes in the Engine Room and Turbine Hall, The base of the Boiler House chimneys, floor tiling in the Engine Room, decorative stonework of the Office and Switch House, aid the legibility and interpretation of the former power house use.

Additions since 1980 have been subject to ongoing change to support the adaptive reuse of the complex as a museum.
Modifications and dates: 1898 - 99: The Ultimo Tram Shed was built, adjacent to the Darling Harbour Goods Line.

1898 - 99: Ultimo Power House built, adjacent to the Darling Harbour Goods Line, (which among other things, would supply coal to it), and adjacent to the 1899 Ultimo Tram Shed / Depot.

1902-1905: Second Boiler House (1899): extended by 54m to the south. Additional boilers installed to serve alternator in Turbine Hall. Adding a second floor for 24 boilers, to new height of 23.5m. As extended it included a new pump room integrated into main building (unlike earlier northern Pump House) and two new 65m tall chimney stacks capped with cast iron crown, at south end.

1912: N new pneumatic ash handling system built at the Boiler House's southern end.

1927-1932: Ultimo Power House underwent a major period of modernisation and remodelling to achieve greater efficiency of operation. This work included replacement and upgrade of much of the industrial equipment and plant, installation of a new pneumatic coal handling plant, and construction to the south of the Boiler House of a new concrete coal store.

c.1930: While one tram track initially extended north from Ultimo Tram Depot to the Power House's Turbine Hall, this was removed c.1930, from which time the space between the two was occupied by a 9m high reinforced concrete coal bunker.


1940s: Ultimo Power House was subject to numerous adaptations and modifications to meet ongoing requirements. During World War 2, precautions were made in case of air raid, including constructing air raid shelters and barricading lower windows of buildings with sandbags.

1940s: Ultimo Post Office: Part of the sandstone pillar on the corner was reconstructed in the 1940s to match the original (AHC, 1984).

1948: the block of land at 550 Harris Street was purchased by the NSW Government Railways allowing a Harris Street frontage to the Power House.

1953: the Sydney Electric Tram network ceased operations, with Ultimo Tram Depot the first depot decommissioned. Security barriers were installed along its southern elevation. From 1953 - 1956 it was used as a non-operational storage shed for c.70 trams prior to scrapping at Randwick. Following the Transport Department departure, the rails, walkways, piers and supporting beams were removed and access ramps added to enhance the space's storage capacity.

1963: Ultimo Power House decommissioned (Engineers Australia citation, 1994) and closed on 11 October 1963. Much of its plant and equipment were dissasembled and removed 1965 - 66, following which buildings fell into disrepair and damage by decay, squatters, vandals (ibid, 2024, 40). After the Power House's closure the main heritage brick buildings, including the Boiler Room and Turbine Hall, were largely stripped of remaining equipment and all associated moveable heritage elements, with new floors laid, roofing elements, and demolition of significant core elements (such as the Boiler Room chimneys in 1977) (before commencement of the Powerhouse Museum project).

1968: a large proportion of the Pump House and chimney was demolished for construction of William Henry Street bridge (ibid, 2024, 40).

1976-77: the two brick chimneys at the southern end of the Boiler House were demolished to the roofline (of that building) resulting in severe damage to its roof (ibid, 2024, 40).

POWERHOUSE MUSEUM (PHM) PROJECT:

1987: The 1930s concrete coal store south of the building demolished as part of adaptive reuse (ibid, 2024, 229). At the beginning of the PHM project, the base of each (Boiler House) chimney was repaired and these formed a vital architectural and service (air intake and exhaust system) element of the Transport, Communications and Space gallery.

Stage 1 - Tram Depot to Harwood Building:
Ultimo Tram Shed was substantially rebuilt as Stage 1. Its walls needed little repair, but the dilapidated roof was replaced in the original saw-tooth form. A glass facade secured the south end, ensuring it echoed the wide-open entrance that greeted arriving trams. For the safety of visitors and staff, tram tracks were removed, and inspection pits covered.

1981: Ultimo Tram Shed / Depot (renamed the 'Harwood Building') refurbished and adapted as a temporary (1981 - 1988) public gallery, conservation and fabrication area and storage space. It was almost completely reconstructed for museum uses. Internal columns, saw-tooth roof trusses, purlins and cladding, internal trackwork, steps and pits, tram tracks in the southern courtyard were all removed; the northern third of the length of its eastern wall, eastern two-thirds of the northern wall, south wall columns and entry doors and associated lean-to buildings were removed.

A basement was excavated under a new floor at ground level and a new steel structure supports a new roof at a higher level than the old, with southern courtyard raised by 1.2m. The dilapidated saw tooth roof was replaced, but with its saw tooth form replicated. A new mezzanine level approximately 10m wide was built along almost the entire length of the east side for storage and offices (ibid, 2024, 120). Its walls needed little repair. A glass facade secured the south end of the Depot, ensuring it echoes the wide-open entrance that greeted arriving trams. For the safety of visitors and staff, the tram tracks were removed, and the inspection pits were covered.

Stage 1 conversion of the Harwood building was uniquely designed with facilities far superior to any Australian museum at the time (ibid, 11/2022). Having facilities for large object handling and treatment, staging and expert staff co-located on site was inseparable from running the museum (Andrew Grant, submission, 3/2024, abridged).

The Harwood Building had five main functions: major workshop with unhindered height of 8m to the trusses; state-of-the-art conservation laboratory; offices for collection management, exhibit design and specialist technical staff; 2500 square meter climate-controlled storage area and a loading / receiving dock for secure object handling. Early on a decision was taken to include an exhibition gallery to provide the public with a foretaste of what to expect in Stage 2 exhibitions. The Harwood building continued as the museum's primary exhibition space (until 1988's opening of the museum alongside) with exhibitions, interactive experiences and a learning laboratory.

It was used as a temporary public (museum) gallery (1981 - 1988), conservation and fabrication area and storage and archive space. A commemorative time capsule was buried in the Mary Ann Street carpark at the opening, including 1981 bottle of Penfolds' 'Grange' wine, Space Invaders game, newspapers, a UBD Street Directory, Sydney telephone books and photos of museum trustees and staff. (ibid, 2024, 42)

Stage 2 - Powerhouse Museum:
1982: works started on reconstruction of the power house.
In 1982, a series of coal hoppers and a steel supporting framework were still in place in the Boiler House, all that remained of a much more substantial system of structures that had once been configured on the external and internal walls of the building. However, the burning of coal to fuel the boilers had created such a corrosive environment that most of this steelwork had been removed by the time the Powerhouse Museum project had begun. The steel framework supporting the hoppers was also severely and dangerously corroded and it was considered that the retention of these structural elements was not possible.
Works mostly resulted in the buildings remaining as shells only, with most (of their) original equipment, plant, machinery and finishes removed, refit(ted) with modern exhibits, amenities, and services as required for the modern museum. The substantial bulk of alterations and additions to the site was focussed along the Harris Street frontage, including construction of the new Wran Building. The water conduit (Water Cooling System and Manifold) connecting the Power House and Darling Harbour was repurposed to serve as part of the museum's air conditioning system (and continues to do so, today).

Internal features (hoppers, fan floors, chimney, 6 columns, small dry coal hopper and personnel elevator) were removed to create a large open space for big-scale exhibitions. The interior of the Power House buildings were cleared with the exception of the gantry cranes in the Engine Room and Turbine Hall and the base of the two Boiler House chimneys (re-purposed for ventilation). Original floor tiling in the Engine Room and decorative stonework in the Office Building and Switch House were kept, aiding the legibility and interpretation of their former uses. New internal floors laid with reference to both the 1893 museum and the Garden Palace, spaces created and new buildings (the Wran Building and the Galleria) were erected on the western side.

The majority of the building fabric was retained, the missing roofs were replaced, machinery pits were filled in to create a safe environment.

Office Building: As part of 1980s adaptive reuse, original spiral staircase removed, basement opened up to install a wider modern staircase connecting all three levels. The staircase from the former entry has been levelled and converted into kitchens on Levels 2 & 3. (ibid, 2/2024, 146).

Engine Room: 1980s adaptive reuse works to convert to an exhibition space retained most of the main structure overall and exterior. Impacts included substantial salvage of interior heritage, including breaking several items - all electrical gear on the western gallery was removed. Alterations included removing the western wall switchboard gallery, concrete engine pads and surrounding tiled walkways, cast iron floor grates allowing crane access to the basement. While northern switchboard removed, the north mezzanine gallery was retained. Partial floor extended across the building, dividing it into two distinct levels, both for exhibitions. Level 2 features modern stairs and mezzanine level to south, separating it from Turbine Hall. Windows and brickwork in exterior (west) wall removed for new openings and connections to Wran Building. In 2020 building used as an exhibition space (ibid, 2/2024, 183, 185, edited).

Turbine Hall: Adaptive reuse (to 1988) included creating three levels, the design divided between several designers - Levels 2 and 3 by Powerhouse in-house design team, Level 4 by museum designers, Denton Corker Marshall (Curio Projects, 2/2024, 206). Revitalisation project 2011-2013, changes included dismantling the Cube structure, relocating a glass lift from Wran Building into hall and replacing escalators with eco-friendly models. Restoration of southern facade also (ibid, 2024, 206).
According to project architect, Lionel Glendenning, the design of the Wran building responded to 'the golden mean proportion' of the Turbine Hall, with Vault 1 making architectural reference to the MAAS's first home in the 1879 Garden Palace, and Vault 2 referring to the arches of the Boiler House (ibid, 2024, 41).

Mezzanine spaces and inserts, external lift and stairs and interpretive graphics on the east elevation were designed to refer to the scale of (coal) hoppers removed. Adaptive reuse ... included creating three levels across the space, including large exhibition space and a new mezzanine at southern end. 1980s interior design was divided between designers including Desmond Freeman Associates ('Transport' section) and Iain Halliday of Neil Burley Designs ('Space' exhibition). In 2020 the Boiler House continued to be used as an exhibition space (ibid, 2024, 229, edited).

Its grand spaces are appropriate for large objects and major exhibitions. As there had been many changes in configuration of equipment and structures during the power station's life, changes for a museum were in keeping with its history. The majority of building fabric was retained, missing roofs replaced, machinery pits filled to create a safe environment, and partial mezzanine floors created to provide display space for smaller exhibitions. The tall Galleria (inspired by the museum's progenitor, the 1879 Garden Palace) and Wran Building, were added on the western side.

The two Boiler House chimney bases were repaired at the beginning of the Powerhouse project and formed a vital architectural and service (air intake and exhaust system) element of the Transport, Communications and Space Gallery (Andrew Grant, submission, 3/2020).

Exhibitions formerly in the (Stage 1 Powerhouse Museum) Harwood Building were relocated to the Power House buildings and the Harwood Building was converted into conservation laboratories, collection storage and office space (ibid, 2024, 42).

1980s: While the 1980s museum design proposed demolition of the Switch House and replacement with a new building, budget constraints resulted in its retention and adaptive reuse. The majority of its interior features were removed and replaced with modern elements and fit-out. Originally it had moulded concrete cabinets carrying cables and bus-bars, but these were removed 1982 - 1984. A new roof annex addition was built, which appears to have been initially designed to function as a cafe. In 1988 parts of the Switch House facade were painted yellow to match the new museum entry facade. Construction of the Harris Street (main public) forecourt as part of the museum works obstructed visibility of lower levels of the Switch House's western facade (ibid, 2024, 250).

7/1988: Sydney Monorail opened nearby, providing access to the new museum from Darling Harbour (and the City), with construction of a nearby monorail station (named Powerhouse Museum Station, in 2002) and covered pedestrian walkway from it to the museum. The monorail line was raised above ground and traffic and ran past the former Ultimo Power House's Boiler Hall alongside the light rail line (ibid, 2024, 42). The monorail ceased operation in 2013, with demolition and removal of its infrastructure, including pedestrian connection to the Switch House, by April 2014 (ibid, 2024, 250).

2005 - 06: the Wran Building's exterior was updated with a white facade to complement the Ian Thorpe Aquatic Centre that was set to open nearby (Curio Projects, 2022, 287).

2006-07: the level 1 courtyard cafe was upgraded and 'Cog's Playground' established in it (ibid, 2022, 287).

2011 - 13: significant modifications and alterations made to the Wran Building as part of the Powerhouse Museum Revitalisation Project, including:
- works to Harris Street forecourt entry and courtyard, cafe and shop;
- blocking of glass facade on Harris Street elevation;
- works to southern facade, including removal of original glass life to allow relocation of the main (public) entry (eastward);
- transformation of the original entrance location to a 1800m2 level 3 temporary gallery;
- demolition (and relocation) of the level 2 toilet block to create a new exhibition space (ibid, 2022, 287).
- revisions to the interiors and exhibition spaces;
- works to link the Switch House with the Harris Street forecourt - initially constructed with a partial void between the Switch House and the bulk of the forecourt, affording access to the lower level of the site. The museum exit was relocated to the Switch House.

2012: the new Museum Shop opened in the Switch House.

2013: a new cafe with seating in the Harris Street forecourt was created.

2013: modifications to the Wran Building included removal of a raised viewing platform (ibid, 2022, 289).

2020: due to COVID-19 restrictions, the Powerhouse Museum, along with all other NSW museums, was closed until further notice.

2022: the Switch House was used as exhibition space, cafe and shop for the museum and a Creative Residency space (ibid, 2024, 250).

2024: The museum closed to the public in anticipation of a regeneration of the site as one ongoing home for the Powerhouse Museum, along with a new facility being built in Parramatta.
Current use: Museum
Former use: Aboriginal land for fishing, resource gathering and other activities, Farming, Commercial/residential, Electricity generating power station, Tram Depot, Post Office

History

Historical notes: Statement of Country:

The Powerhouse Museum Complex is on Gadigal land and for many thousands of years was used by Aboriginal people for traditional practices such as ceremony, fishing and resource gathering. Despite the impacts of colonisation Aboriginal people express an ongoing connection to Gadigal Country and enduring social significance. This tangible and intangible connection to Country is expressed via potential sources of pre and early contact information, and as a symbol of the strong cultural resilience demonstrated in historic Aboriginal protests against the Bicentenary celebrations. The enduring connection to Country is recognised and respects are paid to elders past and present.

Gadigal Country:

The site sits on the land originally occupied by Aboriginal people of the Cadigal/Gadigal, Gommerigal and/or Wangal clans.

The Pyrmont peninsula appears to form part of the boundary between the Wangal and Gadigal clans. Wangal Country extended from Tumbalong (Darling Harbour) west to Rose Hill (near today's Parramatta), while the Gadigal occupied land from the entrance of the (Sydney) harbour, along its southern shore towards Tumbalong. Despite these 'boundaries', Aboriginal people camped on both sides of Tumbalong and smaller, more diverse groups ('bands') fished its waters.

Compared with nearby areas, the Ultimo-Pyrmont peninsula remained largely undeveloped for decades (after 1788), affording retention of a stronger measure of Aboriginal presence not equalled in areas such as Sydney and Farm Coves. This is demonstrated through historical and archaeological records. Archaeological evidence demonstrates how new materials were adopted into traditional practices, such as fashioning a tool from a piece of glass. Colonial descriptions and images depict Aboriginal people camping and fishing around Tumbalong into the 1820s (Curio Projects, 2022, 32).

It was not until the late 1830s and early 1840s that colonists began to turn attention to the Pyrmont peninsula for more rural uses, resulting in land clearance and dislocation of Aboriginal people. The area remained significantly under-developed, in comparison to larger nearby industrialised areas like Darling Harbour, until the late 1880s, and historic records suggest it continued to be used by local Aboriginal people during the mid-19th century for gathering oysters and cockles (ibid, 2022, 32).

In addition to Cadigal/Gadigal and Wangal descendants still living in Sydney today, Aboriginal people from across the state have been attracted since the 1930s to suburbs such as Pyrmont, Balmain, Rozelle, Glebe and Redfern (Heiss, n.d.).

Ultimo Estate:

Ultimo forms the southern half of Pyrmont peninsula, bounded by Darling Harbour on the east, Blackwattle Bay on the west and Broadway on the south. It was first leased from 1796 and in 1803, part of the estate of surgeon John Harris (ibid, 2022, 33). The ridge that is its spine was covered at the Ultimo end by rich alluvial soil. This attracted early market gardens, but Harris's vision for his property was not development, but creation of a country seat.

Industries were attracted to watercourses in the area and Harris moved to rural land (Shane Park) further west in 1821 and rented his Ultimo house. He died in 1838 with no children, leaving his (Ultimo) estate and surrounding properties to be divided equally between brothers William and George. Complications with his will meant that into the mid-19th century Harris Estate land remained underdeveloped (ibid, 2024, 36). By the 1840s the subject property was being surrounded by industry, small commercial properties and abattoirs toward Blackwattle Creek. From the 1850s it was filled with cramped quarters: no fresh water or sewerage, but much flooding. Refuse and offal from slaughter yards was intended to be taken out on the tide, but often remained to rot on mudflats.

Darling Harbour Goods Line (1854-55):

In 1849 Sydney Railway Company approached the Harris family to buy seven acres for a railway connecting what's now Central Station with new wharfing facilities proposed for Darling Harbour, including additional acreage for a goods terminus. This was bought in 1853, but management of railway and land was taken over by the government in 1854 after company failure. A new embankment was built along the western edge of Darling Harbour to support the Goods Line, requiring importing large volumes of soil (ibid, 2024, 36).

Opening in 1855, Darling Harbour Goods Line extended along the east boundary of Ultimo and ended south of the future Pyrmont Bridge. It effectively severed direct connection between Darling Harbour and Harris Street, with the (future) power house site in between. Isolation from the harbour, and underuse of the line in early years, created tension between the Harris family and government, with land around the railway described in 1863 as 'dilapidated, the railway merely an embankment with the rails set on and the terminus undeveloped' (ibid, 2024, 36).

Following the deaths of William and George Harris in 1859 the estate was subdivided (ibid, 2024, 36). The Harrises distributed land to several second- and third-generation family members. There were a few cottage-dwellers dotted around, using land under grace and favour to run cattle or do quarrying, while contemporary reports indicate the area was so unsettled as to remain hospitable to Aboriginal people who still frequented the area.

Government reclamation of the south end of Darling Harbour and 1874 construction of the Iron Wharf reactivated the Goods Line. It became vital transporting wool, coal, shale, timber and wheat in and out of Sydney. With the subsequent industrial boom, Darling Harbour Railway Goods Yard was built 1874 - 88 at the head of the Goods Line (north of the subject site) and grew until the 1920s. The Goods Line became vital transporting large quantities of coal for Ultimo Power House's use, 1899+.

Sydney Technical College (1892) and Technological Museum (1893):

In 1892 Sydney Technical College was built on Mary Ann Street, alongside the Technological Museum, (then, in construction). The college expanded into nearby streets and new buildings, eventually taking in the Harris' Ultimo House. As 1900 approached, the college, in various incarnations, provided a new focus for industrial Ultimo, opening the possibility of further education through night classes in practical and applied sciences for locals. (The Dictionary of Sydney).

The staff and contents moved to the new museum from 1892 - 93. On 4 August 1893 the new museum was opened by Sir Robert (NSW Governor).

Ultimo Tram Depot (1871 / 1898):

The Ultimo Tram Depot is also known as the Ultimo Tram Shed / Car House / Sydney Tram Company Stables and, the Harwood Building.

The development of the tramway public transport system began in a horse drawn tram along Pitt Street from Circular Quay to the Redfern (now Central Station) Terminal, opening 1869. A steam-powered network grew in the 1870s through the city, then rapidly expanded as a commuter service from suburbs. Steep topography saw addition of cable drawn trams in North Sydney and towards Rose Bay in the 1880s.

In 1871 the newly formed Sydney Omnibus Company built stables and hay shed on Block 20 of Ultimo Estate (future site of, Ultimo Tram Depot).

In 1893, the first complete electric line opened on the north shore, its success leading to the decision to adopt electricity for the whole system. A single large electricity generating station was deemed necessary to power it. In 1895, the Minister for Public Works investigated building an electric tram between Circular Quay and Pyrmont (George Street to Harris Street), a proposal accepted in 1896. This was followed by a policy to electrify all tram lines. An Act of Parliament sanctioning the electric tramway, supporting Power House and Car House at Ultimo, was approved in 1896 (ibid, 2024, 37).

In 1897, two blocks between Mary Ann and William Henry Streets were resumed for Ultimo 'Car House', and new power station. The Tram Shed was built in 1898 (ibid, 2024, 64) and opened on 8/12/1899, occupying the whole block. A Store and Repairing Shop, built by T.E. Spencer & Co., adjoined it at the rear and featured the same sawtooth design of (roof of) ibid, 2024, 37, abridged).

This was the first Sydney early 20th century electric tram depot. While its functionality was inextricably linked the neighbouring Power House, both operated completely independently in staffing and function (ibid, 2024, 120).

Conversion of tramlines proceeded rapidly, and expansion of the power station followed in stages. Sydney's electric trams proved popular, tramlines shaped the city's development, and the system became one of the most extensive in the world.
Although an important link, low Pyrmont Bridge (1858) kept ships off Darling Harbour when increased exports made access vital. The solution was to rebuild to open allowing ships through. The government bought the bridge and held an international competition to replace it. The new bridge designed by Percy Allen, was built in 1902 and powered by electricity from Ultimo Power Station.

As other depots came into service, Ultimo was re-organised In 1908 its capacity increased by rear extension of roads (tracks) 1 - 10 for 150'. Roads 11 and 12 were unchanged, 12 continuing west to connect to railway sidings feeding Ultimo Power House (National Trust of Australia (NSW), 1997, 2).

As western tram lines were amongst the earliest closed, tram accommodation requirements shrank from the late 1940s. The Ultimo Tram Depot ceased operating as a traffic depot with conversion of the Drummoyne and Pyrmont Lines to buses in June 1953 and was the first decommissioned in 1963. It was used for storage until the 1970s (ibid, 2024, 120).

Ultimo Power House (1899 - 1963):

Ultimo Power House was the original station supplying power to Sydney's tram network and locally. It was the first large-scale electric plant in Australia. Its location was selected via several factors including: access to Darling Harbour Rail Corridor (Goods, now light rail) lines for coal supply and ash disposal; access to Darling Harbour for sea water for condensers and distribution of electrical current, cheap land and space to expand (ibid, 2024, 37, abridged).

The majority of contracts to construct the tramway, Stabling Shed (and Power House) were let 1897 - 98. J. Stewart & Co. was contracted to build Ultimo Power House and Tram Shed and Justin McSweeney to build the water conduit connecting Darling Harbour to the Boiler House, supplying seawater to condensers (i.e.: water-cooling system and manifold). Power House construction started in 1898. The original facility occupied the north of the block bounded by William Henry Street (to the north). It consisted of Engine House, Office, (Old) Boiler House, Pump House, and original pump house brick chimney stack extending c.91m above flue level (ibid, 2024, 37).

The first power was supplied to the tramway for an experimental ride on 22 November 1899. Ultimo Power House was completed on 29 November and the line's official opening was on 8 December. It was incredibly popular, with 95,000 passengers in 2 days. Originally supplying power for traction for trams, it later extended supply to Eveleigh Railway Workshops (1900) and Central Railway Station (1907) (ibid, 2024, 37). It was of such importance to the Electrical Trades Union it was painted on their union banner by Edgar Whitbread in 1922 (Unions NSW submission, 4/2024).

Ultimo Post Office (1901 - 80s):

The purpose-built Post Office opened in 1901 (on the southeast corner of William Henry and Harris Streets (part of the subject block), replacing a postal operation at 484 Harris Street. It was designed in brick and sandstone in Federation Queen Anne style by the NSW Public Works Department's Government Architect's Branch under (the direction of) Government Architect, Walter Liberty Vernon. It formally commenced operating in July 1901, and continued until the 1980s (ibid, 2024, 37). Since the conversion of the site to a museum in the 1980s it has been used to support the museum function including as a childcare centre and museum volunteers' centre.


Switch House (1922 - 27):

This was built 1922 adjacent to the southern wall of the Turbine Hall. It was purpose-designed to house a new control room, switch gear, and transformers. Works enabled major upgrade of switching of the tram network (ibid, 2024, 38). While the 1980s museum design proposed its demolition and replacement, budget constraints resulted in retention and adaptive reuse. A new roof annex addition was built, which appears to have been initially intended to function as a cafe (ibid, 2024, 250).

Modernisation and Upgrade (1927 - 32):

Between 1927 and 1932 Ultimo Power House saw major modernisation and remodelling for greater efficiency. It became for a time the largest (electricity) plant in the Southern hemisphere (ibid, 2024, 38). From 1927 - 29, it was officially called 'Ultimo Power House'. By 1930, its title was 'Ultimo Power Station'. This continued in use by Electricity Commission and Railway Department until 1979 plans were announced for redevelopment, when its name reverted to 'Power House'.
In the 1920s, electrification of suburban railways led to substantial extension and re-equipping of Ultimo Power House, and White Bay Power Station started up as the second NSW Railway and Tramways Department generating station. These worked closely together until the 1950s.

Sydney Glass and Tile Co. / Herman Haege / petrol station / Dalton Building (1948 - 1963):

The Commissioner of Railways bought 550 Harris Street in 1948 for a frontage to Harris Street. State Railways operated the Power House until 1953 (ibid, 2024, 40). In 1954 Sydney Glass Co. sold their land to paper merchants Herman Haege Ltd. A section was leased to Ampol for a petrol station from 1957. In 1960 the 'Dalton Building' and store was built on Harris Street site of the former Sydney Glass Co. Building (next to Ultimo Post Office). A 1963 Sydney Water map shows Ultimo Post Office on the corner, adjoined by Herman Haege P/L, a right-of-way and service station (ibid, 2024, 69).

In 1953 all NSW power generation facilities were brought together under the Electricity Commission, to deal with chronic post-war power shortages. As the network expanded and new stations came online, Ultimo's old machinery and location saw progressive redundancy. Allied was closure of the tram system, in favour of buses from the 1950s, completed by 1963.
Ultimo Power House was decommissioned in 1963 (Engineers Australia citation, 1994) and closed on 11 October. It had become a minor component in the grid (mostly for trams), superceded in output since 1923 by White Bay Power Station (ibid, 2024, 40).

From its closure until the late 1970s, a range of options of what to do with it were explored, from demolition to reconstruction and intervention. This coincided with a period when the Musuem of Arts and Applied Sciences (MAAS) were investigating options for relocation from Sydney Technical College.

The Museum of Applied Arts and Sciences (MAAS): 1879 - 1981:

The MAAS was founded in 1880 after government acquisition of exhibits from the 1879 Sydney International Exhibition (in 'The Garden Palace', Sydney Botanic Garden) and known initially as the Technological, Industrial and Sanitary Museum of NSW, it suffered early loss with fire destroying The Garden Palace in 1882. With most collections lost, it was re-established in the Agricultural Hall (aka 'Tin Shed') near the State Library in 1883, under Joseph Henry Maiden. The conditions proved inadequate, and in 1893, the Technological Museum moved into a purpose-built home on Harris Street, Ultimo, within Sydney Technical College, where it stayed until 1988 (ibid, 2024, 41). By 1979 the Technological Museum had outgrown the 1893 building.

On 13 August 1979, Premier Neville Wran announced Ultimo Power Station and Tram Depot would become the new home of the MAAS. Dr Lindsay Sharp was appointed Director (MAAS) to oversee the transition and planning started with resumption of the William Henry and Macarthur Street block by the NSW Public Works Department in 1980. The design was coordinated by NSW Public Works Department in close association with the museum's in-house design team (ibid, 2024, 41).

The original construction plan for the new museum was to be undertaken in four stages.

Stage 1: Tram Depot to the Harwood Building:

Stage 1 was opened in 1981 by Premier Wran in an adapted Tram Shed, with exhibits including first railway locomotive (No. 1) in Australia, first car made in Australia, (Hector) Bleriot's monoplane and a replica of Lawrence Hargrave's box-kite. The building was renamed 'Harwood Building' to acknowledge the huge contribution of curatorial driving force behind development of Stage 1 and associated exhibition, Norman Harwood. He was at the peak of a 30-year career at the museum, largely building up transport and engineering collections. From other curators, he gathered object lists, specifications, ideas and aspirations and brought these into meetings with the Government Architect's Branch, public and private contractors. The aim was a sympathetic blend of respectful treatment of historic building envelope and a flexible and functional facility that would become 'Australia's most sophisticated museum services complex'. The close collaboration between museum, Government Architect's Branch and Public Works Department set the standard for Stage 2 (see 19th and early 20th century Tram Depot / Harwood building history, above).

The Harwood Building had five main functions: major workshop; state-of-the-art conservation laboratory; offices for collection management, exhibit design and specialist technical staff; climate-controlled storage area and a loading / receiving dock for secure object handling. Early on a decision was taken to include an exhibition gallery to provide the public with a foretaste of what to expect in Stage 2 exhibitions. It continued as the museum's primary exhibition space (until 1988's opening of the museum alongside) with exhibitions, interactive experiences and a learning laboratory.

Stage 2 Main Powerhouse Museum:

Stage 2 would occupy the former Ultimo Power House buildings next door. 1982 saw funding made available and works started on reconstruction. Primary individuals responsible were Lionel Glendenning, architect; Peter Johnson, Director of Design; Peter Root, Project Director; and Lindsay Sharp, PHM/MAAS museum director. They worked with structural and mechanical engineers, acoustics, interiors and exhibit designers, graphic designers, furniture makers and designers, curtain and carpet designers. The works involved many local firms and contractors, with over 250 people employed on site daily and over 300 individual building contracts let to local firms. Between 1981 and 1990, in anticipation of the new facilities, 24,948 objects, including donations and bequests, were accessioned into the MAAS collection.

A heritage report (Godden et al, 1984) reported on the condition of power house buildings (although the adaptation of Ultimo Tram Shed was undertaken prior to this, without detailed heritage assessment and recommendations (being) prepared. While the report made recommendations for retaining Power House equipment and machinery in its adaptive reuse and interpretation, the majority were overridden in the design process for budgetary and time reasons (ibid, 2024, 41).
Adaptive reuse works mostly resulted in the buildings remaining as shells only, with most original equipment, plant, machinery and finishes removed, refit(ted) with exhibits, amenities, services as required. The bulk of alterations and additions were along the Harris Street frontage, including the new Wran Building. The water conduit (Water Cooling System and Manifold) connecting Power House and Darling Harbour was repurposed to serve as part of air conditioning system (and continues to, today). According to Lionel Glendenning, the design of the Wran building responded to 'the golden mean proportion' of the Turbine Hall, with Vault 1 making reference to MAAS's first home the 1879 Garden Palace, and Vault 2 to the arches of the Boiler House (ibid, 2024, 41).

In 1984 the Darling Harbour Authority was formed to redevelop Darling Harbour as a tourist destination with museums, shops, entertainment, restaurants, hotels, monorail and bars, created as a gift to the people of NSW in celebration of Australia's Bicentenary as a nation, in 1988. This brought about major changes to Ultimo and Pyrmont. The new Powerhouse Museum was an integral part of this project of national importance.

The Bicentenary was a highly significant historic event also in raising the issue of Aboriginal rights on the international stage, with over 40,000 Aboriginal people and non-Aboriginal supporters staging the largest protest march held in Sydney (at the time), during celebrations. Aboriginal people from other states, rural and remote communities joined. It challenged white Australia's construction of the 1788 Botany Bay and Sydney Cove landings of the First Fleet, founding of the colony of New South Wales and what that represented. The march (through the city to Hyde Park) was both affirmation of indigenous Australians' survival and stark reminder of the falsity on which the celebration was premised, which ignored injustice, suffering and dispossession for Aboriginal peoples (Curio Projects, 2024, modified).

Stage 2 saw adaptive reuse of Power House buildings along with the newly constructed Wran Building (ibid, 2024, 42). This saved buildings from further deterioration and demolition. It was an important early heritage conservation activity following the Green Bans of the 1970s. This adaptive reuse is an early and important Australian example of this practice. Developing a museum in the cavernous spaces presented a unique opportunity to interpret MAAS's transport and engineering collections that documented the technological revolution in power around 1900 within a space contemporary with that transformation. Interiors were cleared, with the exception of gantry cranes and base of two Boiler House chimneys (re-purposed for ventilation). New internal floors were laid with reference to both the 1893 museum and 1879 Garden Palace, spaces created and new buildings (Wran Building and the Galleria) erected on the western side.

At completion, the museum was state-of-the-art in curatorial standards. Exhibition spaces were designed to be used flexibly, galleries with high floor and ceiling loadings and soaring spaces capable of enormous digital projections, suspended aircraft, steam engines and aerial acrobatics. The sea-water heat exchange and cooling system, reusing Ultimo Power House's redundant water-cooling system, provided 24-hour air-conditioned climate control, at 22 degrees Celsius, 60% humidity, high filtration of micro dust and gases. Low UV lighting and glass was installed; existing historic overhead travelling cranes refurbished and recommissioned, steam boilers and a bespoke reticulated steam supply system installed for the steam engine collection.

Stage 2 opened to the public in March 1988, as flagship MAAS exhibition space, with the Harwood Building becoming offices, workshops, and state of the art conservation laboratories and storage for the collection. The complex saw 20,000 visitors the first day and 25,000 the next. By September, it had received its 1 millionth. Between July 1988 and June 1989, there were 2,112,001. Architect Gae Aulenti who designed the interior of Musee d'Orsay (Paris, 1986) was an early visitor. It presaged London's Tate Modern, a converted Bankside Power Station - and yet-to-be adaptive reuse of Blackhawk Generating Station into Beloit College Powerhouse (USA).The Director of London's Science Museum, Dame Margaret Weston, stated at (the) opening that 'This museum will rate among the best in the world. The architecture of the old building blending with the new building and the exhibition design is splendid' (SMH, 11/3/1988). Other key early visitors included Sir Terence Conran, Trustee of (London's) Victoria and Albert Museum, later Chairman of the Design Museum; Richard McCormack, President of the Royal Institute of British Architects; Rt. Hon. Margaret Thatcher, UK Prime Minister; Her Majesty Queen Beatrix of the Netherlands; Daryl Jackson, architect for Museums Victoria; and designers Marc Newson, Philippe Starc, Karim Rashid and Ron Arad.

The re-design won numerous awards including Australian Institute of Architects (AIA) - NSW Chapter's Sir John Sulman Medal for public buildings (Powerhouse Museum) in 1988, the AIA National President's Award for Recycled Buildings, AIA NSW Chapter Belle Interiors Award for Interior Design, Australian Tourism Awards winner - tourist attractions (1988), and was a finalist for the National Sir Zelman Cowen Award. It won the ACROD Award for barrier free circulation, the 1988 Illuminating Engineering Society of Australia's Meritorious Award for display lighting in NSW, Westpac Museum of the Year Award (1988), the Australian Tourism Commission's Best Tourist Attraction in Australia Award (1988). It would win NSW Tourism Commission Tourism Award for excellence, major tourist attraction (1988), NSW Tourism Industry Association (ATIA) Award of distinction for outstanding contribution to tourism in NSW (1990) and a Building Owners and Managers' Association of Australia (BMOA) Award for excellence (1990). Further ATIA Awards flowed for excellence (1993), distinction in cultural tourism (1994), cultural tourism and distinction in the NSW Tourism Awards - major tourism category (1994). It was no. 3 in the top ten - the only venue that was not a dedicated event venue in the National Business Magazines' Top 100 Conference Venues (1997) and no. 5 in the top ten event venues (1998) and top ten finalist (2001) in those Australia wide National Business Bulletin annual surveys) (Sanders, 2008).

The complex influenced other adaptation projects in New South Wales, Australia and internationally (e.g. Casula Powerhouse (Liverpool) and Carriageworks (Eveleigh / Redfern) in NSW; Brisbane Powerhouse; and Longreach Powerhouse and Historical Museum in Queensland; Spotswood Pumping Station conversion into Scienceworks; and the Malthouse Theatre in Victoria; and adaptive reuse of Blackhawk Generating Station into Beloit College Powerhouse, Wisconsin in the USA (ibid, 2024.42) and of the Birkside Power Station into Tate Modern, in London, UK.

The Powerhouse was unique in being a museum devoted to applied arts, science and technology. Its nearest equivalents are the Victoria and Albert Museum in London, whose brief is 'art and design' and the Smithsonian Institution in America, which divides its operations between 19 separate museums. The diversity and extent of collections was notable.

The opening of the Sydney Monorail in July 1988 provided access to the new museum from Darling Harbour (and the City), with a nearby station (named Powerhouse Museum in 2002) and covered pedestrian walkway from it to the museum. The line was raised above ground and traffic and ran past the former Ultimo Power House's Boiler Hall alongside the light rail line (ibid, 2024, 42).

The learning environment, a direct result of the relationship of purpose-designed exhibits in the context of purpose-built and adapted buildings, was one of the first new Australian museums designed to move away from static displays to interactive engagement. The 1980s saw a movement towards exploration, interactivity and hands-on. These ideas were put into museum practice in science centres, focusing on experiential learning and the role of the museum to facilitate rather than dictate meaning. Glendenning's design lauded opportunities afforded by the Power House, accommodating both traditional style museum and more radical, experimental display spaces.

One review in the journal 'Technology and Culture' described the Powerhouse Museum as setting 'new standards for the emergent generation of Australian museums' and it was applauded for its 'interactive displays'. Its opening predated Questacon in Canberra and Scitech in Perth (1988); the Maritime Museum in Sydney (1991); Science Works in Melbourne (1992); the Melbourne Museum (2000). In 1986-87, William Burch, Assistant Director of the Australian Science and Technology Centre, Andrew Reeves, Deputy Director of the Museum of Victoria, and John Barker, Executive Officer of the Western Australian Science, Industry and Technology Council, all visited.

The Powerhouse Museum was the first of several post-modern developments in Ultimo, along with the ABC Centre and the University of Technology, building on the area's history of education and leading the way for newer and different industries centred around information and entertainment.

When it opened in 1988, there were 25 permanent exhibitions and, for the first two decades, these were updated with a program of partial or complete changes of content. Permanent exhibitions and galleries were supplemented with special events and visiting exhibitions.

In 2014 the government announced plans to relocate the museum to a new facility in Parramatta and sell the site for redevelopment. The ensuing public furore, with advocates on both sides, has dominated operation and perception of the museum until the present (2020) (National Trust of Australia (NSW).

In 2015 the Ultimo site was suggested for redevelopment whilst keeping a cultural use. The museum's heritage halls were expected to close on 30 June 2020. On 4 July 2020 the government announced it had abandoned plans to sell the site and will use the Parramatta site as a second Western Sydney location for the museum. This meant the MAAS would soon boast 4 centres, at Ultimo, Sydney Observatory, the Museums Discovery Centre at Castle Hill and Parramatta.

In 2020 the Ultimo Power House was listed on the State Heritage Register. Treasurer Dominic Perrottet and Arts Minister Don Harwin announced the Ultimo Powerhouse Museum would be retained and renewed (Curio Projects, 2022).

In 2021 the first post-COVID exhibition - one of 12 - featured largely homegrown displays embedded with social and oral history.

On 4 December 2023, Minister for the Arts John Graham announced a revised project scope for the Powerhouse Ultimo revitalisation, with a budget of $250 million (Curio Projects, 2024).

In February 2024 the museum closed to the public for three years in anticipation of regeneration as one ongoing home for the Museum, along with a new facility currently being built in Parramatta.

The Harwood Building in 2024 is still used by the Museum and staff for administration, conservation and exhibition construction (MAAS submission, 2024).

Historic themes

Australian theme (abbrev)New South Wales themeLocal theme
2. Peopling-Peopling the continent Aboriginal cultures and interactions with other cultures-Activities associated with maintaining, developing, experiencing and remembering Aboriginal cultural identities and practices, past and present. Aboriginal Culture-
3. Economy-Developing local, regional and national economies Events-Activities and processes that mark the consequences of natural and cultural occurences Developing national landmarks-
3. Economy-Developing local, regional and national economies Industry-Activities associated with the manufacture, production and distribution of goods Energy supply industry-
3. Economy-Developing local, regional and national economies Transport-Activities associated with the moving of people and goods from one place to another, and systems for the provision of such movements Building and maintaining the public railway system-
4. Settlement-Building settlements, towns and cities Accommodation-Activities associated with the provision of accommodation, and particular types of accommodation – does not include architectural styles – use the theme of Creative Endeavour for such activities. Adapted heritage building or structure-
5. Working-Working Labour-Activities associated with work practises and organised and unorganised labour Working complex machinery and technologies-
5. Working-Working Labour-Activities associated with work practises and organised and unorganised labour Working on public infrastructure projects-
6. Educating-Educating Education-Activities associated with teaching and learning by children and adults, formally and informally. Community education - adults, school excursions-
8. Culture-Developing cultural institutions and ways of life Creative endeavour-Activities associated with the production and performance of literary, artistic, architectural and other imaginative, interpretive or inventive works; and/or associated with the production and expression of cultural phenomena; and/or environments that have inspired such creative activities. Developing cultural institutions and ways of life-National Theme 8
8. Culture-Developing cultural institutions and ways of life Creative endeavour-Activities associated with the production and performance of literary, artistic, architectural and other imaginative, interpretive or inventive works; and/or associated with the production and expression of cultural phenomena; and/or environments that have inspired such creative activities. Applying architectural design to utlilitarian structures-
8. Culture-Developing cultural institutions and ways of life Leisure-Activities associated with recreation and relaxation Going to a museum-

Assessment of significance

SHR Criteria a)
[Historical significance]
The location of the Powerhouse on the original western shoreline of Cockle Bay/ Darling Harbour has historic significance as a location for fishing, resource gathering and other activities by Aboriginal people and location of early contact with Europeans.

The Ultimo Power House (former) is of State significance historically for being the first state-owned, large electricity generating station in NSW and original generating station for the supply of electricity to power the electric tramway network throughout Sydney. At the time of its construction and for some years after it was one of the largest such plants in Australia. From 1899 to 1963 it was one of the largest and most important generating stations in NSW.

The Ultimo Power House site is historically significant as a place where the NSW electricity authorities trialled significant technological advancements and innovations in electrical generation. This included steam turbines and large-scale, alternating-current generation and steam turbines.

The Water-Cooling System and Manifold is historically significant for its integral role in the function of the Ultimo Power Station and remains in use, drawing water from Sydney Harbour as part of the air conditioning system of the Powerhouse Museum.

Ultimo Power House (former) has associations with electrification of the suburban tramway and railway systems and with the general reticulation of electrical power in Sydney. It supplied power to, and has close association with, Pyrmont Bridge (SHR 01618), Glebe Island Bridge (SHR 01914), Sewage Pumping Station No.1 (SHR 01336) at Ultimo (and 15 other low level sewage pumping stations in Sydney), the Ultimo Tram Depot (Harwood building) and the Darling Harbour Goods Line. The historical purpose and function of the former power station is readable today through the building fabric, structure, in-situ engineering structures, gantry cranes and chimney bases.

Ultimo Power House (former) is also of State historic significance for its role in the transformation of the Powerhouse Museum complex and in the wider heritage conservation movement in NSW.

The Ultimo Tram Shed (Harwood building) has State historic significance as the first tram depot shed in NSW, first of Sydney's electric tram depots, and at the time the model for all the others. It has a close association with the Powerhouse Museum as its initial public exhibition space, conservation workshops, conservation laboratories, climate-controlled storage facility and offices from its beginning and opening to the public in 1981. It was the public face of the Powerhouse Museum until Stage 2 opened in 1988 and has continued to service it since 1981. The Harwood building has been extensively rebuilt to recreate its saw tooth roof design.

The Powerhouse Museum Complex has State historic significance as an iconic museum and a major cultural project marking Australia's 1988 Bicentenary. The Bicentenary was a significant event in the history of NSW and a transformative period in Sydney's history, particularly for urban design and heritage conservation. The Bicentenary has State historic significance as a significant event in raising the issue of Aboriginal rights on the international stage, with more than 40,000 Aboriginal people and non-Aboriginal supporters staging the largest protest march held in Sydney (to that time), during celebrations. This challenged white Australia's construction of the landing of the first fleet and what it represented.

Of many cultural and heritage projects undertaken to mark the Bicentenary, the Powerhouse Museum stands out for the scale of its design ambition, cultural investment in the collections and museum infrastructure, popular acclaim and impact of the museum since 1988, and the development of a landmark museum with a distinctive museology and exhibition design. It was a historic milestone in the gentrification of Darling Harbour.

The Powerhouse Museum was and remains the largest museum in Australia with over 42,000 square meters of state-of-the-art exhibition spaces and collections, conservation, and research facilities. It is the principal museum of technology, industry, science, design, and decorative arts in NSW. It inherits from the earlier Technological Museum historical and cultural associations with their origin in the 1879 Sydney International Exhibition, an important international event demonstrating Australia's industrial and manufacturing capabilities to the world.

The Powerhouse Museum Complex was influential in the urban design of the later buildings in the precinct and other museum facilities across Australia and internationally. It is contemporary with the Musee d'Orsay in Paris and was an inspiration for several subsequent adaptations of industrial heritage buildings, including the Tate Modern (London, UK) and the Blackhawk Generating Station into Beloit College Powerhouse, Wisconsin (USA.).

The Powerhouse Museum Complex is of State historic significance as the first large scale conservation and adaptation of an industrial heritage site in Australia and the first in NSW for cultural purposes (with few precedents at the time). It was the first such project undertaken with conscious heritage intent, framed around retention, adaptation, and restoration of the former power house. The complex was one of the first of the 'new' generation of museums that opened in Australia in the 1980s. Museums moved from a didactic single-point-of-view model to a more democratised, participatory, representative and interactive engagement experience. The Powerhouse's opening predated Questacon (Canberra, 1988), Scitech (Perth, 1988), the Maritime Museum (Sydney, 1991), Scienceworks (Melbourne, 1992) and the Melbourne Museum (2000). The museum complex, as completed, was considered at the time to be a highly innovative design, producing state-of-the-art museum by world standards. The changes to the Powerhouse Museum buildings and spaces since opening demonstrate the need for museums to continually evolve in response to contemporary museum standards.
SHR Criteria b)
[Associative significance]
The Pyrmont Peninsula on which the Powerhouse Museum Complex is located, is recognised as being associated at a State level with the Gadigal people and broader Aboriginal community, providing ongoing links to pre and post-colonisation Aboriginal connection.

The Powerhouse Museum Complex has significance at a State level for its associations with several notable figures. These associations include with project champions, former NSW Premier Neville Wran, who personally conceived, approved, and encouraged the project, and then Minister of Works and Deputy Premier, Jack Ferguson, who formed a remarkable political partnership championing many cultural and heritage achievements, this being their most substantial and ambitious. Wran and Ferguson formed a key part of the NSW government's vision for Darling Harbour, to redevelop land around it as a gift to the people of NSW celebrating the 1988 Bicentenary.

It has associative significance at State level for the design work of principal design architect Lionel Glendenning as his most substantial and significant architectural and cultural achievement, exhibitions designer and director, Richard Johnson, and Powerhouse Museum director, Dr Lindsay Sharp. This State associative significance extends to the NSW Public Works Department and Government Architect's Office in representing a high point in their output and outstanding quality of work. It includes those involved in adaptive reuse of the power house to the museum. These include Norman Harwood, the museum's transport and engineering curator and the curatorial driving force behind development of both Stage 1 facilities (Ultimo Tram Sheds, or the Harwood building).

State significance for individual buildings within the complex includes the Ultimo Tram Shed (Harwood building) historic association with railway engineer Henry Deane, Chief Engineer for the NSW Railways and Tramways from 1890 - 1905, and the Ultimo Post Office (former) association with the office of the NSW Government Architect, under Walter Liberty Vernon.
SHR Criteria c)
[Aesthetic significance]
Collectively, Ultimo Power House (former) and Ultimo Tram Shed (Harwood building) have State aesthetic significance as a landmark group of buildings which relate closely to the visual and architectural industrial context and functioning of the area. The Boiler House building was, in its day, one of the largest brickwork structures in NSW and its (former) chimneys were significant Sydney landmarks for 70 years. The former power station has State technical significance as a site of technological transfer and innovation for electricity generation in NSW and possibly in Australia.

Ultimo Tram Depot (Harwood building) has State aesthetic significance as the original, largest, and model tram shed for the NSW electric tramway system and as a unique design. Whilst the alterations made to adapt it for museum related uses, particularly those to the arrangement of the roof cladding are extensive, they have not changed the building's original overall form.

Ultimo Post Office (former) has State aesthetic significance as an outstanding example of a Federation former post office demonstrating many of the key aspects of the Federation Classical and Romanesque architectural styles. It has aesthetic significance as a public building prominently sited at a major intersection, and an important streetscape element.

The Powerhouse Museum Complex has State aesthetic and technical significance for its successful reuse as a purpose-designed and built museum successfully integrating old buildings with new. Its conservation and adaptation was recognised as successful design, with awards including Sir John Sulman Medal for excellence in public architecture, Australian Institute of Architects (AIA) National President's Award for Recycled Buildings, AIA NSW Chapter Belle Interiors Award for Interior Design and as a finalist for the National Sir Zelman Cowen Award. It was influential in the urban design of later buildings in the precinct and other museums across Australia and internationally.

The Powerhouse Museum Complex has State architectural and technical significance as a major early example of the adaptive reuse of a large-scale industrial heritage site, which was then a radical and exhilarating new approach to museum making for NSW.

The spatial relationships achieved in the adaptive reuse resulted in the complex's harmonious sense of place, with intentional visual connections between individual buildings. The remains of the two Boiler House chimneys were re-purposed for ventilation and access, internal refurbishment and interpretation undertaken, and the Wran building erected on the western side.

The distinctive roof form (comprising two arches), and general scale of the Wran building characterises the architectural influence of the 1988 museum redevelopment. The transformation of the Power House through conservation and adaptation was recognised with several awards and has been influential in the urban design of later buildings in the surrounding urban area.
SHR Criteria d)
[Social significance]
The Powerhouse Museum Complex has State social significance as a highly esteemed educational and cultural institution and tourist destination. Its form and use are held in demonstrable public esteem at State level by communities, including the Gadigal and other Aboriginal communities, transport, machinery and engineering groups, architects, archaeologists, museum volunteers, historians, museologists, educators, heritage practitioners, tourists, donors, educators, and visitors. These strong attachments to the site are represented in national and State awards, listings, high visitation, and long-standing campaigns for retention of the museum.

As a cultural and learning institution across the applied arts and sciences the complex's form and use are held in esteem at State level. The positive, sustained community esteem is demonstrated to be ongoing since 1988.
Assessment criteria: Items are assessed against the PDF State Heritage Register (SHR) Criteria to determine the level of significance. Refer to the Listings below for the level of statutory protection.

Procedures /Exemptions

Section of actDescriptionTitleCommentsAction date
57(2)Exemption to allow workHeritage Act - Site Specific Exemptions Exemption Order for Powerhouse Museum Complex listing on the SHR No. 02045 under the Heritage Act 1977

I, Penny Sharpe, the Minister for Heritage, on the recommendation of the Heritage Council of New South Wales dated 8 May 2024, make the following order under section 57(2) of the Heritage Act 1977 (the Act) granting an exemption from section 57(1) of the Act in respect of the engaging in or carrying out of any activities described in Schedule C by the owner, manager, mortgagee or lessee (or persons authorised by the owner or manager) of the item described in Schedule A on the land identified in Schedule B.
This Order takes effect on the date it is published in the NSW Government Gazette.


Dated this 9th day of July 2024.

The Hon Penny Sharpe MLC
Minister for Heritage


SCHEDULE A
The item known as the Powerhouse Museum Complex, situated on the land described in Schedule B.


SCHEDULE B
All those pieces or parcels of land known as as Lot 1 Deposited Plan 631345; Lot 1 Deposited Plan 781732; Lot 1 Deposited Plan 216854; Lot 3 Deposited Plan 631345; Lot 37 Deposited Plan 822345; Lot 1 Deposited Plan 770031, located at 494 - 500 Harris Street, Macarthur Street, Omnibus Lane, Ultimo, and as identified as the "State Heritage Register - Recommended Curtilage" on the Plan 3326 in Schedule A.


SCHEDULE C
The following specified activities/ works to an item do not require approval under section 57(1) of the Act.

GENERAL CONDITIONS
i. These general conditions apply to the use of all the site-specific exemptions and must be complied with.
ii. Anything done under these exemptions including assessment of significant fabric and of heritage impacts must be conducted by people with knowledge, skills and experience appropriate to the work (some site-specific exemptions require suitably qualified and experienced professional advice/work).
iii. These exemptions do not permit the removal of relics or Aboriginal objects. If relics are discovered, work must cease in the affected area and the Heritage Council of NSW must be notified in writing in accordance with section 146 of the Heritage Act 1977. Depending on the nature of the discovery, assessment and an excavation permit may be required prior to the recommencement of work in the affected area. If any Aboriginal objects are discovered, excavation or disturbance is to cease, and Heritage NSW notified in accordance with section 89A of the National Parks and Wildlife Act 1974. Aboriginal object has the same meaning as in the National Parks and Wildlife Act 1974.
iv. Activities/ works that do not fit strictly within these exemptions require approval by way of an application under section 60 of the Heritage Act 1977.
v. These exemptions are self-assessed. It is the responsibility of a proponent to ensure that the proposed activities/works fall within the exemptions.
vi. The proponent is responsible for ensuring that any activities/ works undertaken by them meet all the required conditions and have all necessary approvals.
vii. Proponents must keep records of any activities/ works for auditing and compliance purposes by the Heritage Council of NSW. Where advice of a suitably qualified and experienced professional has been sought, a record of that advice must be kept. Records must be kept in a current readable electronic file or hard copy for a reasonable time.
viii. It is an offence to do any of the things listed in section 57(1) of the Heritage Act 1977 without a valid prior exemption or approval.
ix. A person guilty of an offence against the Heritage Act 1977 shall be liable to a penalty or imprisonment, or both under section 157 of the Heritage Act 1977.
x. Authorised persons under the Heritage Act 1977 conduct inspections for compliance.
xi. These exemptions under the Heritage Act 1977 are not authorisations, approvals, or exemptions for the activities/ works under any other legislation, Local Government and State Government requirements (including, but not limited to, the Environmental Planning and Assessment Act 1979 and the National Parks and Wildlife Act 1974).
xii. These exemptions under the Heritage Act 1977 do not constitute satisfaction of the relevant provisions of the National Construction Code for ancillary works.
xiii. Activities or work undertaken pursuant to an exemption must not, if it relates to an existing building, cause the building to contravene the National Construction Code.
xiv. In these exemptions, words have the same meaning as in the Heritage Act 1977 or the relevant guidelines, unless otherwise indicated. Where there is an inconsistency between relevant guidelines and these exemptions, these exemptions prevail to the extent of the inconsistency. Where there is an inconsistency between either relevant guidelines or these exemptions and the Heritage Act 1977, the Act will prevail.
xv. The Heritage Manual (1996, NSW Heritage Office and Department of Urban Affairs & Planning) and The Maintenance Series (1996 republished 2004, NSW Heritage Office and Department of Urban Affairs & Planning) guidelines must be complied with when undertaking any activities/works on an item.

Note: Exemptions 2 - 6 apply to all buildings and spaces on site, where they do not conflict with any building-specific, or space-specific exemptions under 7 -13.

EXEMPTION 1: EXISTING CONSENTS
Specified activities/works:
a) All works and activities which are in accordance with a current and valid development consent in force at the date of gazettal for listing of the Powerhouse Museum Complex on the State Heritage Register under the Heritage Act 1977.

EXEMPTION 2: HERITAGE INTERPRETATION AND SIGNAGE
Specified activities/works:
a) Maintenance and repair to existing interpretation infrastructure, elements and signage.
b) Maintenance and repair of existing wayfaring signs and decoration remaining from significant periods of the site's history.
c) Installation of new interpretation signage or relocation of existing interpretive signs or elements where these are in accordance with an interpretation plan prepared by a suitably qualified and experienced heritage professional.

Note: applies to all buildings and spaces on site, where they do not conflict with any building or space-specific exemptions under 7 -13.

EXEMPTION 3: EXHIBITIONS
Specified activities/works:
a) Installation, alteration and removal of exhibitions, provided penetrations made into original floors, walls and ceilings are minimal.

Note: applies to all buildings and spaces on site, where they do not conflict with any building or space-specific exemptions under 7 -13.

EXEMPTION 4: DISABILITY ACCESS
Specified activities/works:
a) All interior and exterior works and activities to provide disability access in accordance with the Disability (Access to Premises - Buildings) Standards 2010, that does not adversely impact significant fabric and spaces and are reversible.

EXEMPTION 5: MINOR AND TEMPORARY WORKS AND MAINTENANCE
Specified activities/works:
a) Essential repair or like-for-like replacement of all deteriorated significant heritage fabric.
b) All works to non-significant interior fabric, fittings, finishes, lighting, layouts and furnishings within buildings inserted since 1980.
c) Installation and upgrade of information technology systems and audio-visual equipment, where this work does not adversely impact significant fabric or spaces.
d) Maintenance and renewal of floor finishes inside buildings constructed before 1980.
e) All works to the exterior of buildings erected on the site since 1980, not including works which would significantly alter the significant visual connections between individual buildings within the complex, or the distinct roof form of the Wran building.
f) Erection of temporary hoardings (for periods of up to 18 months, with minimum 6 months between) and scaffolding for the purpose of maintenance or conservation of significant heritage fabric.
g) Installation of essential safety services, including upgrades to internal security devices, such as electronic door locks and keys, security cameras and motion sensors inside buildings (minimising the number of fixings to external original heritage fabric where possible) and internal fire sprinklers if there is no adverse impact to significant heritage fabric, fixture, or form.
h) Electrical, mechanical and hydraulic services maintenance and essential upgrades located within the building envelope and on the roof top within the envelope of the existing plant, including roof exhaust fans and associated support duct work for buildings, where there is little or no adverse visual impact on heritage significance, but excluding mobile telecommunications equipment and antennae. This excludes non-maintenance works to the Water-Cooling System and Manifold, under the Turbine Hall floor and connected to the site's air-conditioning system.
i) Changes to operating hours.

Note: the above exemptions apply to all buildings and spaces on site, where they do not conflict with any building or space-specific exemptions under 7 -13.

EXEMPTION 6: OPEN SPACE WORKS (HARRIS STREET FORECOURT, SOUTHERN FORECOURT, INCLUDING SECTION OF THE GOODS LINE)
Specified activities/works:

a) Maintenance, minor alterations and replacement of external hard paving, planter boxes, roads, fences, gates, retaining walls and public seating elements that:
i. Does not require excavation deeper than the foundations of the existing elements into non-disturbed land; and
ii. Will have no adverse or irreversible impact on significant fabric, including any potential archaeological features.

EXEMPTION 7: PUMP HOUSE
Specified activities/works
a) Maintenance and repairs to surviving exterior fabric.
b) Removal or alteration of the modern asphalt paving across the former Pump House's footprint, including concrete access stairs adjacent to the Boiler House's northern faade and access to William Henry Street.

EXEMPTION 8: ENGINE HOUSE
Specified activities/works
a) Removal or alteration of modern stairs added in 1980s to reinstate more of the Engine House's original internal space.
b) Maintenance and repair of original and/or replica floor tiles installed in the 1980s.

EXEMPTION 9: SWITCH HOUSE
Specified activities/works
a) Maintenance, repair and alterations to the interior fabric and finishes, including partition walls, internal glazing, lighting (non-original, or reproduction original) and signage for buildings and infill constructed post 1988. Excludes original windows.
b) Alteration or removal of roof top terrace and pitched roof, to reinstate original flat roof.

EXEMPTION 10: ULTIMO POST OFFICE (FORMER)
Specified activities/works
a) Alteration or removal of the 1980s rear addition building provided any alterations are similar in scale, sympathetic in form and materials.
b) Removal and replacement of the metal lattice security fence east and west of the building, provided a more sympathetic replacement fence is installed.
c) Removal and replacement of steel security bars installed in the original windows, provided a more sympathetic form of security is installed, requiring minimal additional penetrations into original wall and window fabric.
d) Alterations to or removal of the rear covered walkway.
e) Alterations to and development of internal layouts, fittings and furnishings added post 1980.

EXEMPTION 11: HARWOOD BUILDING
Specified activities/works
f) Changes to internal layouts, fittings and furnishings constructed post 1980 to support function of the Powerhouse Museum Complex.

EXEMPTION 12: WRAN BUILDING
Specified activities/works
a) Changes to internal layouts, fittings and furnishings constructed post 1980 to support function of the Powerhouse Museum Complex.

EXEMPTION 13: WORKS BY OR ON BEHALF OF SYDNEY WATER
Specified activities/works
The following activities where undertaken on or behalf of Sydney Water for the purpose of the functioning of its existing assets:
a) The carrying out of works, within the meaning of the Sydney Water Act 1994, is exempt from subsection 57(1) of the Heritage Act 1977, subject to all excavation or disturbance of land being carried out in accordance with any Environmental Planning and Assessment Act 1979 approval for those works.
b) Minor works necessary to preserve and maintain the functioning of Sydney Water's existing assets, including modifications, upgrades and improvements, provided that the minor works do not adversely impact significant fabric or elements.
c) Minor works necessary to preserve and enhance the security of Sydney Water's existing assets such as security fencing, video surveillance and detection systems, provided that the minor works do not adversely affect significant fabric or elements.
d) Temporary works including containment areas, scaffolding and enclosures necessary for carrying out of maintenance, enhancement and upgrading works.
e) Installation of safety and information signs, not being for commercial or advertising purposes.
f) Temporary and reversible works.
Jul 12 2024
57(2)Exemption to allow workStandard Exemptions HERITAGE ACT 1977

ORDER UNDER SECTION 57(2) TO GRANT STANDARD EXEMPTIONS FROM APPROVAL

I, Penny Sharpe, the Minister for Heritage, on the recommendation of the Heritage Council of New South Wales and under section 57(2) of the Heritage Act 1977:

revoke the order made on 2 June 2022 and published in the Government Gazette Number 262 of 17 June 2022; and

grant an exemption from section 57(1) of the Act in respect of the engaging in or carrying out the class of activities described in clause 2 Schedule A in such circumstances specified by the relevant standards in clause 2 Schedule A and General Conditions in clause 3 Schedule A.

This Order takes effect on the date it is published in the NSW Government Gazette.

Dated this 29th day of October 2025
The Hon Penny Sharpe MLC
Minister for Heritage

For more information on standard exemptions click on the link below.
Nov 7 2025

PDF Standard exemptions for engaging in or carrying out activities / works otherwise prohibited by section 57(1) of the Heritage Act 1977

Listings

Heritage ListingListing TitleListing NumberGazette DateGazette NumberGazette Page
Heritage Act - State Heritage RegisterPowerhouse Museum Complex0204512 Jul 24 2682 - 8
Heritage Act - s.170 NSW State agency heritage registerWater Cooling System and Manifold    
Heritage Act - s.170 NSW State agency heritage registerThe Darling Harbour Rail Corridor    
Local Environmental PlanPowerhouse Museum former Warehouse Buildings, incl12031   
Local Environmental PlanFormer Ultimo Post Office including interior12030   
National Trust of Australia register Former Ultimo Tram Depot Tram Shed (Powerhouse MusS1061130 Jul 97   
National Trust of Australia register Ultimo Power House (former Turbine Hall, Boiler HoS1164824 Jun 15   
National Trust of Australia register Powerhouse Museum 29 Jul 15   
Royal Australian Institute of Architects registerThe Powerhouse Museum at Ultimo (including the for4701884   
Institution of Engineers (NSW) Historic Engineering MarkerPowerhouse Museum National Engineering Marker    
Register of the National EstateUltimo Post Office2381   
Register of the National EstateThe Powerhouse Museum (stage 1) (Harwood Building)10069127 Oct 98   
Register of the National EstateThe Powerhouse Museum (Stage 2)100690   

References, internet links & images

TypeAuthorYearTitleInternet Links
WrittenAMBS Ecology & Heritage2018Historical Archaeological Assessment
WrittenArchitectural Projects2003Conservation Management Plan: The Powerhouse Museum
WrittenAurecon2022Powerhouse Ultimo: Conservation Management Plan Engagement 'What we heard' Consultation Report
WrittenBrassil, Tony2019Ultimo Tram Depot (The Harwood Building), History and Significance2019
WrittenCoast History and Heritage2022Draft Aboriginal Overview - Powerhouse, Ultimo
WrittenCurio Projects P/L2024Powerhouse Ultimo - Conservatoin Management Plan 2022 - revised (2024)
WrittenCurio Projects P/L2022Powerhouse Ultimo - Conservation Management Plan 2022
WrittenCurio Projects P/L2020Aboriginal Due Diligence Heritage Assessment Report
WrittenDesign 5 Architects, with Lionel Glendenning and Richard Johnson Powerhouse Museum Design Principles (draft)
WrittenDon Godden and Associates1984Ultimo Power House - History and Technology
WrittenFitzgerald, Shirley and Golder, H.1994Pyrmont & Ultimo under siege
WrittenGilbert, Lionel2001The Little Giant - the life and work of Joseph Henry Maiden, 1859 - 1925
WrittenGlendenning, Lionel1982The Power House Ultimo
WrittenGodden Mackay P/L1994Tramway Workshops, Depots and Substations - Survey and Assessment
WrittenGodden, D.; Higginbotham, E; Pinder, J.; Whittaker, R; Young. The History and Technology of the Ultimo Power House Sydney - a report to the Government Architect's Branch
WrittenHawley, Janet1988'How five angry men created history'
WrittenInstitution of Engineers, Australia1994Nomination of Ultimo Power House as a site for an Historic Engineering Marker View detail
WrittenLonergan, Peter and Chan, Hugo2020Powerhouse Museum, Ultimo. Independent heritage assessment commissioned by the Heritage Council of NSW
WrittenMatthews, M.R.1982Pyrmont & Ultimo: a History
WrittenSanders, Jennifer2019'The Powerhouse Museum: its place in the world, our nation, NSW, our neighbourhood and, our hearts and minds'
WrittenSanders, Jennifer2008Powerhouse Museum: Awards from 1988 to 2008
WrittenSanders, Jennifer and Petersen, John2018The Powerhouse Museum: an exhibition archive 1988 - 2018
WrittenWinkworth, Kylie2019Policy, Power and the Cultural and Heritage Values of the Powerhouse Museum
WrittenWood, C.1988'Powerhouse'

Note: internet links may be to web pages, documents or images.

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Data source

The information for this entry comes from the following source:
Name: Heritage NSW
Database number: 5068313


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