Guardian: The credit crunch is forcing Britain’s power companies to pay high prices for their borrowing and could have a long term impact on supply, according to the UK’s top energy regulator. Alistair Buchanan, chief executive of Ofgem, said the global financial crisis was making it harder for companies to borrow and, when they could, the terms were increasingly expensive. Buchanan told the cross-party business and enterprise committee of MPs yesterday that companies were paying 4% to …