The company has also introduced a new package of support measures for customers who may be hit hardest by the increases.
Willie MacDiarmid, ScottishPower's energy retail director, said that the firm had "worked hard" to protect its customers.
He said: "Our input costs are now at record levels, having increased by up to 97 per cent since February 2007.
"Like other energy providers, we are now forced to pass on some of these higher costs."
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