All payments will be made automatically, and customers do not need to do anything.
Andrew Ward, from Scottish Power, said: “We’re so sorry that a very small number of our customers were affected by this mistake and faced an increased financial burden – especially during a time when energy prices were reaching an unprecedented high and the government had to step in to provide support.”
He said the company took swift action when the error emerged, and reported itself to Ofgem, the sector’s regulator.
