The Ultimo Power Station, or Ultimo Powerhouse, was an electricity generating plant located in the inner-city Sydney suburb of Ultimo, New South Wales. Commissioned in 1899, it was the first major power station in Sydney and was originally built to supply power for the electric tram network. Prior to this, a small installation had existed at Regent Street, which was brought into use on 15 June 1882. Additionally, experimental electric tram operations powered by small generators had been in intermittent use in Sydney since 1890.