British Gas owner Centrica are planning to cut 700 management and back office jobs under previously announced reductions.
As part of the “ongoing transformation” company staff have been informed of the cuts.
A spokesman said’ “This difficult decision was made because we need to respond to the growing challenges we face. The energy market is going through continued rapid change, competition is fierce, our energy customers are leaving us and we’re operating under a price cap.
“Over the next 45 days, as part of a full consultation process, we will discuss the proposals and seek the views of employees and their representatives.”
Unions have said the job losses are a “terrible blow.”