The museum most accounts describe cannot be visited. Powerhouse Ultimo closed on 4 February 2024 for a revitalisation whose reopening date has never been announced — reported estimates run from 2028 to 2029 — and its collection has gone to a new storehouse at Castle Hill. A second museum, Powerhouse Parramatta, opens on 7 November 2026. One thing the old account got right, fifteen years early: much of the collection really was destined for a new building at Castle Hill.
Four sites, one of them shut
The organisation runs Powerhouse Ultimo, Powerhouse Parramatta, Powerhouse Castle Hill and Sydney Observatory. Of those, Ultimo — the one everybody means by "the Powerhouse" — has been closed since 4 February 2024. The date is worth stating carefully: the museum and the state department both give 4 February, while the ministerial release that announced the closure said the 5th.
Ultimo, and the work going on inside it
The revitalisation is to reorient the museum towards the Goods Line and the city with a new northern entrance and public square, reveal the power station's 1899 façades and 1902 turbine hall, add exhibition space, conserve the heritage buildings, and house a Powerhouse Academy for regional students developed with the University of Technology Sydney. The scheme is by Durbach Block Jaggers with Architectus, landscape by Tyrrell Studio, with Richard Crookes Constructions appointed to the main works in June 2025.
The money has moved: 250 million dollars was announced in 2023 and the figure given since 2024 is 300 million — though the museum's own revitalisation page still carries the lower number while its own list of frequently asked questions carries the higher one.
No reopening date has been announced, and the schedule has slipped a long way. The 2023 announcement implied about three years, pointing to 2027; main works only moved from site preparation into active construction in May 2026, with the first tower crane up that September. Published estimates since have run from late 2027 to 2029. Anyone planning around a particular year is guessing.
The fight over the site, which is the reason any of it survives
In 2014 the state government promised to move the Powerhouse to Parramatta and sell the Ultimo site, demolishing the 1988 building. A parliamentary inquiry found the plan rested on poor planning and advice, a flawed business case and insufficient consultation, and urged that it be abandoned. On 4 July 2020 the sale was scrapped and Ultimo was to stay, operating alongside Parramatta. A later version would have been a mixed-use cultural and commercial complex, taking the curved roofs of the Wran Building with it.
What locked the site down was heritage listing. The complex went onto the State Heritage Register in September 2020, and in July 2024 the listing was extended to cover the whole site including the Wran, Galleria and Harwood buildings — an extension reported to bind the site to museum use, so that it cannot be sold or commercially developed. The register entry is 02045.
The present works are not purely conservation, and it is fair to say so. Planning approval came in March 2025, and in June 2025 a modification was sought on the grounds that the upper steel structures of the Wran Building and the Galleria were non-compliant and at the end of their life; it was determined in November 2025, and those structures are to be taken down and rebuilt, replicating their form and scale rather than being retained. A second modification was exhibited in September 2026. Former directors, a former trustee and the National Trust have all objected publicly at various stages, in terms ranging from wasteful upheaval to cultural cleansing.
Parramatta, which opens on 7 November 2026
The second museum opens on Saturday 7 November 2026, about a year later than first announced. It is by Moreau Kusunoki of Paris and Tokyo with the Australian practice Genton, from an international competition held in 2019, and runs to roughly 30,000 square metres.
It opens with five exhibitions and more than 3,000 objects, over 1,600 of them from the Powerhouse collection. The two named are Task Eternal, on space exploration, with loans from NASA, the Smithsonian and the British Museum, a James Turrell work and the Qantas Avro 504K, and The Mall. The building also holds about thirty apartments for artists and researchers on stays of up to three months, and student accommodation.
General entry is free, with some exhibitions ticketed — Task Eternal among them. The published cost is 915 million dollars including 75 million in philanthropy, a figure that also covers the new storehouse at Castle Hill; an answer to a question on notice in the Legislative Council in September 2025 gave the government's own contribution as 840 million and the estimated total as not available. The Parramatta site also involved the demolition of the Willow Grove heritage house, which drew objections of its own.
Castle Hill, where the collection went
The Museums Discovery Centre is still there, run jointly by the Powerhouse, the Australian Museum and Museums of History NSW. Beside it, a purpose-built collection storehouse opened to the public on 23 March 2024 — Lahznimmo Architects, builder Taylor — holding more than 300,000 objects including a three-thousand-square-metre store for the transport collection. It took the Sir Zelman Cowen Award for Public Architecture and a state architecture award the same year.
It is at 2 Green Road, Castle Hill, free, and open weekends only, from ten to four; tours of the deep stores must be booked. With Ultimo shut, the museum states that its collection is in one place for the first time in its history.
Sydney Observatory
It is part of this organisation, though it is not named in the governing Act. It is open Thursday to Sunday and tours are charged, running Wednesday to Sunday — the museum's own pages do not quite agree on the days. Heritage conservation works are under way with no published end date, and access to some areas may be affected.
What it is called, and under what Act
The organisation trades as Powerhouse, but it was never renamed. The statutory body is the Trustees of the Museum of Applied Arts and Sciences, under the Museum of Applied Arts and Sciences Act 1945, and both names remain in force; the name Museum of Applied Arts and Sciences was used informally from about 1950 and made official by an Act of 1961. Earlier still it was the Sydney Technological Museum and then the Museum of Technology and Applied Science. No dated announcement of the change to the Powerhouse trading name could be found; what can be traced is that annual reports were still tabled under the old name as late as 2021–22.
One real statutory change did happen. The Cultural Institutions Legislation Amendment Act 2025, commenced 1 October 2025, raised the number of trustees from nine to ten and requires at least one to be aged between eighteen and twenty-eight at appointment.
Founded in 1879, and the palace that burnt before it opened
The museum dates from 1879 and the collection of the Sydney International Exhibition — so the "over 125 years" of older accounts understates it by two decades, and the hundred and forty the museum's own homepage claims does not square with its own founding date either.
Its first home was to be the Garden Palace, which burnt down in September 1882 before the museum opened in it. The curator Joseph Henry Maiden rebuilt the collection; it was housed in the Agricultural Hall and then, from 4 August 1893, in a purpose-built Harris Street building by the Government Architect W. E. Kemp, as the Sydney Technological Museum.
At Ultimo, the converted tram depot now called the Harwood Building opened as museum space in September 1981, and the main museum opened in March 1988. So the museum has occupied part of that site since 1981 rather than 1988. Its address is 500 Harris Street, which is correct but is not its original site.
The building, which powered the trams
It was the Ultimo Power House, and it generated electricity for Sydney's tramway network rather than for public supply — a distinction usually lost. Nor is it simply nineteenth century: the engine house is 1898 to 1899, the boiler house 1899 to 1902, the turbine hall 1902 and the switch house 1922 to 1927, with the adjoining tram car house of 1898 to 1899 extended in 1908. The power house opened in December 1899 and closed in October 1963; the depot stopped handling trams in June 1953.
The 1988 conversion was by Lionel Glendenning as principal architect in the Government Architect's office, with Richard Johnson of Denton Corker Marshall as exhibition designer, and it won the Sir John Sulman Medal.
The objects, and the ones that were never here
The collection is now given as more than 500,000 objects, not the 400,000 of older accounts, and no exact count is published.
Locomotive No. 1 hauled the first passenger train in New South Wales in 1855, on the Sydney to Parramatta line — not in 1863, and it is the first passenger working rather than simply the first locomotive to run in the colony. It was built by Robert Stephenson and Company of Newcastle upon Tyne to a design by James McConnell, and it moved to Castle Hill on 18 July 2024 with three carriages, where it is on display; it is to return to Ultimo after the works.
The Strasburg Clock — the museum's own spelling — is better than its reputation. It was built between 1887 and 1889 by Richard Bartholomew Smith, a Sydney clockmaker who had never been to Strasbourg and worked from a postcard and a book, and it was bought by the state government in 1890. It models the astronomical clock in Strasbourg Cathedral, with a dial added showing the sun, moon and stars over Sydney. It is not on display.
The Bluebird wheel is real: a wheel and tyre from Donald Campbell's Bluebird-Proteus CN7, in which he took the wheel-driven world land speed record at Lake Eyre on 17 July 1964. A comparable wheel is held in Melbourne, so it is not unique.
Three things in older accounts could not be substantiated at all and are best dropped rather than corrected: a Frank Gehry chair, which does not appear in the collection under any date — and whose supposed early-1960s date would be wrong in any case, since Gehry's cardboard furniture is of 1969 to 1972; a section of the mast of HMS Victory, which is not traceable in the collection, the comparable relic being at Portsmouth; and a life-size space shuttle cockpit, which appears nowhere in the museum's own exhibition record.
The art deco cinema is a recreation, called Kings Cinema, which opened with the museum in March 1988. The Manly cinema its seats are said to have come from opened on 25 August 1933 as the Embassy Theatre and only took the Odeon name in 1960, closing in 1984 — so "the Manly Odeon, built in 1932" is wrong in both the year and the name, and the provenance of the seats rests on enthusiast sources rather than the museum's own.
Two named galleries had already gone before the old account was last touched: Inspired! ran from October 2005 to August 2010, and the chocolate-tasting machine belonged to Chemical attractions, opened in February 1996 within the Experimentations gallery.
Who runs it, and the investigation
The board is a Board of Trustees headed by a President: the Hon David Borger OAM, announced in December 2024, succeeding the Hon Peter Collins AM KC.
The executive is unsettled, and the facts should be stated plainly and no further. Lisa Havilah, chief executive since 2018, was stood aside on 27 August 2026. Abbie Galvin, the NSW Government Architect, became interim chief executive from 1 September 2026, with Louise Herron, formerly of the Opera House, appointed strategic adviser. The chief operating officer Mark Wilsdon went on leave in July 2026 and was replaced on an interim basis by Cassandra Wilkinson.
The background is a state government misconduct investigation into governance and procurement, run by the sponsoring department and authorised by the arts minister. A fact-finding assessment began in March 2025 with a referral to the Independent Commission Against Corruption; a formal investigation was authorised in December 2025; allegations were put to executives in April, July and August 2026. No findings have been made.
How many come
For the year to June 2024 the annual report gives 2,358,943 in total, of which 390,196 were onsite and 1,968,747 offsite. Only the onsite figure compares with other museums, and it covers a year in which Ultimo shut in February. The last full pre-closure year, to June 2019, recorded 757,166 onsite.
There is no Australian equivalent of the independent visitor-number audits published in Britain, so the museum's own reports and the state's published series are the only figures available, and the Powerhouse will not appear in international museum rankings while Ultimo is closed.
Access
At Parramatta: step-free throughout by lift, ramp and escalator, described as fully accessible; accessible toilets on several floors with an adult changing place; five wheelchairs at the concierge; hearing augmentation by app or loaned receiver; Auslan interpretation at selected programmes and about three weeks' notice for others; Quiet Times on Mondays from ten to twelve; assistance animals welcome; no on-site parking, with drop-off on Phillip Street.
At Castle Hill: accessible throughout by ramp and lift, entering by the Windsor Road gate, with accessible parking on site, a quiet room, and quieter periods at ten and between twelve and one in term time.
At Sydney Observatory the heritage fabric sets a hard limit: wheelchair access reaches the gardens and the ground floor of the Astronomer's Residence only, and the tours are not wheelchair accessible, involving narrow, steep stairs and more than a hundred steps.
What is coming
The near date is Parramatta's opening on 7 November 2026, with an opening festival reported to run to the end of that month. Beyond it, Ultimo's main works are expected to take up to three years from May 2026, with no announced reopening; the Observatory's conservation works have no published end date; and the state's own figures for 2024–25 were tabled but could not be read for this account.
Two anniversaries fall inside the next few years and nothing has been announced for either: 2028 is forty years since the Ultimo museum opened and a hundred and seventy since the Observatory was established, and 2029 is a hundred and fifty years since the museum was founded.
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