From the early 20th century Geevor was electrically powered.
The electricity was first supplied by the Cornwall Electric Power Company of Hayle. As the mine developed the demand for electricity grew. In the early 1950s a bigger substation was built at Trewellard. From this sub station an underground cable brought the electricity to a switchgear to the substation at Geevor.The transformers reduced the voltage before transferring it to different parts of the mine.
To keep everything working properly, the mine required up to 2.2 megawatts of power a day, about £800 a day. The site today uses less then 5% of the 2.2 megawatts.