- 25 updates
Scottish Power said it was forced to raise bills because it "can no longer continue to shield our customers" from cost increases.
Neil Clitheroe, Scottish Power's chief executive for Energy Retail & Generation, said the company's costs have risen across the board for buying gas and electricity, supplying it to homes and dealing with customers.
"I find it very difficult having to increase our prices," Clitheroe said. "Each of these costs have been rising over the course of this year, and we have now reached a point where we can no longer continue to shield our customers from these increases."
Calls to the Citizens Advice Bureau about energy prices have doubled since companies announced increases to bills.
The number of people seeking online advice also shot up, rising to 30,118 between 10 and 23 October, compared to 19,436 in the 13 days before the price increases.
Scottish Power said that over a million of its 3.2 million customers will not be affected by its price rises because they are on fixed or capped tariff deals.
The company has customers throughout the UK but is especially popular in Glasgow, Edinburgh, Merseyside and North Wales.
Energy Secretary Ed Davey encouraged consumers to switch to providers outside of the big six:
ScottishPower said the average duel fuel bill for its customer will increase by £113 per year due to increasing costs.
The price rises are primarily driven by the:
- 7% increase in wholesale energy costs
- 11% rise in the costs of delivering energy to customers' homes
- 16% increase in the costs to support compulsory social and environmental schemes
ScottishPower will raise the average prices of its duel fuel bulls by 8.6%, gas by 8.5% and electricity up 9%.
Labour leader Ed Miliband said the Government has offered a "panicked wheeze" on energy bills instead of a price freeze.
Mr Miliband said today, "The reason that bills are rising is not because of green levies it's because we've got a Government that is not getting a grip on a set of companies that are overcharging people in the market".
"The price freeze will happen if Labour wins the election," he added.
Major energy firms will give evidence on rising prices to MPs on the Energy and Climate Change Committee on Tuesday. These are the officials that will appear:
- Tony Cocker, Chief Executive Officer, E.ON
- William Morris, Managing Director, SSE
- Guy Johnson, External Affairs Director, RWEnpower
- Stephen Fitzpatrick, Managing Director, Ovo Energy
- Neil Clitheroe, Chief Executive Officer - Retail and Generation, Scottish Power
- Ian Peters, Managing Director - Energy, British Gas
- Martin Lawrence, Managing Director - Energy Sourcing and Customer Supply, EDF Energy
- Ramsay Dunning, Group General Manager, Co-operative Energy
The interim head of the energy regulator Ofgem, Andrew Wright, will also appear.
A Downing Street spokesman said the coalition "is intact" after Deputy Prime Minister Nick Clegg admitted there is a Government split over green energy levies.
Asked whether the row over energy, coming hard on the heels of differences about the operation of free schools, meant that the Government was "unravelling", the spokesman said Prime Minister David Cameron and Mr Clegg continue to work "highly effectively" together.
Latest ITV News reports
Scottish Power has increased its gas and electricity bills as rifts appear in the Coalition over green energy taxes.
David Cameron has announced a review of competition in the energy market and vowed to roll back green regulations.