i'm not sure what the regulatory laws regarding power companies are in the UK, but that domain would at least have appeal to a british energy company.
but i'm not sure how often "UK Electric" as a term gets searched, so you would have a hard time turning to the development option if you'd have to. that term is memorable and brandable, but the dash does hurt it a bit.
i dont see why energy companies would want a different domain from the one they own now, esp. if their business is negotiating contracts with the government as opposed to getting individuals to sign up with them. it's not like a web site would serve a huge function. so you could have a hard time finding an end-user in that respect also.