The first gasworks started on land north on Tondu Iron Works, shown on the 1875 OS map as having two gasholders. The site then spread east to land across the Feeder channel where further gasholder had been built by 1897. The Garw & Ogmore Gas Company was formed in 1891 by SA, with the first gas manufactured in 1895. The gasworks were evidently in operation privately before the formation of the company. An article in the Glamorgan Gazette of the 27th of December 1907, “proposes that the company may acquire by agreement the supply of gas in the district now supplied by the existing private gasworks belonging to North's Navigation Company, Limited, situated at Tondu.” The gasworks had a private siding into the works through the Tondu Iron Works. In 1914 the Garw and Ogmore Gas Company invited tenders for the purchase of the disused gas works plant at Pontycymmer (GW). (This appears to refer to obsolete plant for sale on the original site, then known as Pontycymmer). The Garw and Ogmore obtained a purified supply of gas from the Tondu Colliery plant in the interwar years but retained their horizontal retort plant. The Tondu coke ovens provided more gas than required and this was sold on to Bridgend, through a gas main which linked the Garw gasworks with those at Bridgend. The gasworks were visible on the OS maps from 1876 to 1948.