The Prime Minister's official spokesman said Ofgem has given "a very strong signal" that energy companies will not "get away with" bad practice after the it fined ScottishPower £8.5 million.
Asked if David Cameron was happy with the level of the fine, he replied:
Those must be, of course, decisions for the regulator but I think it does send a strong signal in response to bad practice that was being looked at here.
More top news
As Yemen's war enters its third year more than 1,500 children have been killed and a similar number have been recruited in the fighting.
BT has been fined £42 million and is expected to pay £300 million in compensation to rivals over delayed high-speed cable installations.
Dozens of dogs have been flown to the US after they were rescued from a farm in South Korea where they were destined for human consumption.