Tesla is dominating the UK mega battery market. The 16 UK batteries from which Tesla trades power account for nearly all the top-performing assets by revenue. Tesla’s success is down to the sophisticated approach of the company’s Autobidder trading software as well as its batteries’ larger storage capacity and location, experts said. Tesla has supplied its own Megapack grid-scale battery units to 20 of the 182 battery developments in Britain’s market, amounting to installed capacity of 695 megawatts, Modo analysis shows. It trades the output from 16 of them. Those 16 mega batteries made an average £91,364 per megawatt between October 2024 and October 2025, according to Modo. They made up 16 of the top 20 best performing units on that basis over the same period, earning a total of £52mn, and performing better than many battery units whose power is traded by energy giants such as BP and EDF.