These were the original gasworks in Blackwood, which are shown on the 1879 OS maps only. These gasworks were in the centre of the village on the high street and predate the Blackwood Gas & Water Co. Ltd was formed in 1890. The link between the two gasworks is unclear. When the new gasworks were built in Blackwood, they were referred to as new gasworks suggesting that there had been an old gasworks. In 1891 a manager was being sought for the Blackwood gasworks, the gasworks had 8 small retorts and the manager was required to be a good carbonizer and abstainer (South Wales Daily News - 3rd March 1891). The gasworks were visible on the 1879 OS map.