Scottish Power will raise the cost of gas by 19 per cent and the cost of electricity by 10% from August 1. Affected customers will see an average daily rise to a dual fuel energy bill of 48p per day. The company said the move reflected sustained increases in the wholesale energy market, and more energy companies are expected to follow suit. Scottish Power last put its prices up in November, when gas prices increased 2% and electricity bills 8.9%.