The energy regulator Ofgem has told ITV News that power networks could face fines if it is proved that they failed to respond quickly enough to reconnect customers left with no electricity after the storms at Christmas.
A "number of questions" need to be answered over the performance of power networks during the Christmas period when thousands of customers were left without power due to a storm, Ofgem said.
Senior partner Ian Marlee told ITV News: "What we've seen is the network companies do some good work, we've seen them restoring supplies under difficult conditions, we've seen them having learned the lessons of previous disruptions, for example, offering meals to people who are cut off.
"Nonetheless, there are a number of questions that remain outstanding, for example...were the companies prepared sufficiently? Did they act quickly enough to restore supplies? Was the information they provided to consumers adequate?
"These questions need to be answered and we will be getting a report from the companies and clearly if that means lessons need to be learned or regulatory action needs to be taken then we will do so."
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