The Admiralty gasworks were located outside the Dockyard, on Fort Road, they date back to 1855. The house of commons returns for 1860, indicated that the gasworks were extended with the inclusion of another 10 retorts, c1859. The gasworks were supplying 637 public lights and 93 private lights in officers’ houses. The gas mains at this time were 6.2 miles long. The Admiralty gasworks supplied gas within Pembroke Dockyard, primarily for lighting purposes, supplying both the Dockyard Authorities and War Department. It was replaced by a power station which produced electricity c1900. There were two gasholders at the site.