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21/10/2013 05:23 BST | Updated 21/10/2013 08:43 BST

Npower To Increase Energy Bills By 10.4%

LONDON - APRIL 21:  Prof. Heinz Wolff explodes the myth that science is for geeks as he launches npower's Search for Britain's Bright Ideas - a quest for clever energy saving inventions at The Science Museum on April 21, 2009 in London.  (Photo by Gareth Cattermole/Getty Images For npower)
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LONDON - APRIL 21: Prof. Heinz Wolff explodes the myth that science is for geeks as he launches npower's Search for Britain's Bright Ideas - a quest for clever energy saving inventions at The Science Museum on April 21, 2009 in London. (Photo by Gareth Cattermole/Getty Images For npower)

Npower has become the third major energy supplier to unveil a price rise, as its unveiled a 10.4% increase, which would add £139 to an average annual bill.

The energy firm's increase, the highest rise from any supplier announced so far, will take effect from 1 December and will affect two million customers. Npower's price rise comes after SSE announced it would put up prices by 8.2% from 15 November and British Gas would increase theirs from 23 November by 9.2%.

The Npower increase includes an electricity price rise of 9.3% and a gas price rise of 11.1%.

Npower chief executive Paul Massara said: "I know that any increases to household bills are always unwelcome, and this is not a decision that we have taken lightly. We will continue to take steps where we can to reduce the impact of the external influences on energy bills."

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Npower has increased prices by £247 since November 2012. The energy firm's price increases come after Labour leader Ed Miliband pledged to freeze prices for 20 months if his party wins the next election.

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But Prime Minister David Cameron branded Mr Miliband's price freeze plan as a "con", saying that he did not have control over the worldwide price of gas.