Major UK energy firm faces being 'shut down' after Ofgem banNow, the regulator has now issued the firm with a "notice of failure to comply with a confirmed provisional order". View Image Major UK energy firm faces being 'shut down' after Ofgem banA major UK energy firm faces being SHUT DOWN - just months after Ofgem BANNED it from taking on new customers. Tomato Energy could be shut down after Ofgem banned it from taking on new customers. ‌"The opening of these compliance cases does not imply that Ofgem has made any findings about non-compliance by Ecotricity, SO Energy, and Tomato Energy. The energy supplier's website reads: "We are temporarily not accepting new registrations or providing quotes for new customers.