The gas undertaking in Milford Haven was transferred to the Milford Haven U.D.C. in 1888 forming the Milford Haven U.D.C. Gas Department. In 1894-5 the Milford gasworks made 5.4m cu.ft. from 665 tons of soil supplying 145 consumers, they had 3 miles of gas mains and 81 public lamps. In 1909 it was suggested “that a single lift Gadd and Mason spiral guided gas holder prepared for a second lift the tank for this holder to be constructed of steel. A second lift can be added to this holder when required. The proposed new single lift would hold about 35,000 cubic feet, this together with the 29,000 of the present holders would give a total holder capacity of 64,000 cubic feet, which is equal to 123 per cent*, of our present maximum daily make, or, in other words, our holder accommodation would be more than doubled” (Haverfordwest and Milford Haven Telegraph 30th June 1909). In 1952 the “Gas World Year Book”, showed that Milford Haven and Neyland gas undertaking was manufacturing 62 m cu.ft. of gas using horizontal retorts and a CWG plant and J.H. Daniels was the engineer and manager. In 1898, John Thomas was the Superintendent, T. H. Lewis the Secretary and Dr. G. Griffith the Chairman (Local Authority), the annual gas production was 4.6m cu.ft. serving 150 consumers. In 1900, John Thomas was the Manager, Thomas H. Lewis the Secretary and George Griffiths the Chairman. The annual gas production 5,937,600 cu.ft. of 16cp gas from 702 tons of coal using 3 miles of mains. In 1938 the annual gas production 39,168,000 cu.ft. of 450 btu gas in vertical retorts, from 2,414 tons of coal. Annual Sales 31,790,800 cu.ft. of which 2,318,000 cu.ft. was supplied to Industrial customers. The undertaking had 18 miles of gas mains and R. J. Calderwood was Engineer & Manager. In 1939 a gas main was laid to Neyland, where the UDC ceased to make gas in the former GWR works, taking a bulk supply from Milford Haven. In 1949, the annual gas production was 68,000,000 cu.ft. with sales of 56,000,000 cu.ft. cv 490 btu. Intermittent Vertical Chamber Oven and CWG plant. J. H. Daniels, Engineer & Manager. Production at Milford Haven ceased in 1957 when it was connected to the South Wales Western Grid. The Milford Haven gasworks closed in 1957, when gas was then supplied through an extension of the South Wales Gas Grid. The gasworks were visible on the 1862 to 1878 OS maps.