To get anywhere with this, you will have to show that the company failed to take reasonable measures to avoid the eventually dire length of this power outage. You may have a case based on the series of mess-ups that occurred, but they will almost certainly try and hide under the Regs.
The Electricity Supply Act 1989 and others specifically excludes consequential or economic loss arising from a loss of supply - which is why the power companies advice customers to have insurance.



