Formation of The Hengoed Gas & Water Co. Ltd. was formed in 1877. The South Wales Daily News from 7th December 1877, reported “OPENING OF THE HENGOED GASWORKS. On Thursday the new gas works at Hengoed gasworks were formally opened. The works, which are near the Maesyewmnier Factory, will produce about 4,000 feet of gas per hour. Mr Willey and Co., Engineering Works, Exeter, put up the gas apparatus, Mr Lane being the foreman. Mr Gould. of Newport, Monmouthshire, did the gas fittings. The masonry was done by Mr W. Jones, Hengoed. At the opening ceremony, Mr Lewis, the chairman, made a few remarks, and led Mrs Perrott (of Hengoed Hall) to the meter-house, where that lady performed the act of turning on the gas, and the works were declared opened.” In 1884 the annual gas production was 1m cu.ft.. of 14cp gas from 140 tons of coal. 40 consumers. Gas price 5/6d., public lamps charged 50/- each. P. Whyte, Manager. I. Jones, Secretary. Also supplies Fleur-de-Lis and Pengam. In 1898 the Hengoed Gas and Water Company Ltd was amalgamated with other companies to form the Rhymney & Aber Valleys Gas & Water Co. Ltd. under an act of parliament of this name. The new Company took gas from the Bargoed coke ovens of the Powell Duffryn company starting October 1907. Hengoed was on the route of the new main from Bargoed to Caerphilly and the works probably ceased gasmaking at an early date. The undertakings records are held at the Glamorgan Archives, through the Rhymney & Aber Valleys Gas & Water Co. Ltd. The gasworks were visible on the 1895 to 1973 OS maps.