Tesla has quietly built a leading position in the UK’s mega battery market, deepening its role in Britain’s efforts to shift away from fossil fuels.

The group led by Elon Musk not only supplies large-scale batteries to plant developers but also trades the power generated by them. Tesla’s batteries perform the best in terms of revenue in an increasingly competitive market that has also lured the likes of Goldman Sachs, data from battery market specialists Modo Energy indicates. 

The data comes two weeks after Ed Miliband, the energy secretary who is leading Britain’s clean-energy transition, gave a speech in which he told Musk, to “get the hell out of our politics and our country”, after the tech billionaire criticised the UK via his social media site X.