LONDON--Facing mounting pressure to ease the strain of rising energy bills on already hard pressed households, U.K. Prime Minister David Cameron said Wednesday the government would launch a review of the energy market looking at competition, prices, profits and barriers to new entrants in the sector.

And in a sign that the prime minister is willing to risk the government's environmental credentials and unsettle coalition relations, Mr. Cameron vowed to roll back green levies--the portion of household electricity and gas bills that goes towards green schemes and climate change programs--as well as support for poorer households.

Energy bills have become the focus of a fierce political battle over how to tackle the decline in living standards Britons have faced in recent years as wages have been outpaced by prices. Mr. Cameron has been under growing pressure to respond after Ed Miliband, the leader of the center-left opposition Labour Party, said last month that he would freeze household energy prices for two years if he wins the general election in 2015.

Adding urgency to the debate, in recent days three of the six energy firms that dominate the British market have announced hikes in gas and electricity prices of about 8%-10% and the remainder are expected to follow suit. The so-called "Big Six" comprise Centrica PLC (CNA.LN) division British Gas, German RWE AG's (RWE.XE) npower, Iberdrola SA's (IBE.MC) Scottish Power, SSE PLC (SSE.LN), E.ON AG (EOAN.XE) and Electricite de France SA (EDF.FR).

Speaking in parliament, Mr. Cameron said household energy bills had reached unacceptable levels. He said there are four parts to an energy bill: wholesale energy prices, which are beyond the government's control; the cost of transmission and the national grid, which are difficult to change; the profits of energy companies; and green levies and the cost of meeting other regulations.

"And it is those last two that we need to get to grips with," he said. "We will be having a proper competition test carried out over the next year to get to the bottom of whether this market can be more competitive. I want more companies, I want better regulation, I want better deals for consumers--but also yes, we also need to roll back the green charges."

On Tuesday, former prime minister John Major, who is from Mr. Cameron's center-right Conservative party, suggested the government introduce a windfall tax on energy company profits to recover money lost to rising energy bills. The government said the comments were interesting but it had no such plan.

Mr. Cameron's aides explained the annual process of review of the energy market would be carried out by energy sector regulator Ofgem, consumer and competition watchdog the Office of Fair Trading, and the government's new Competition and Markets Authority.

Work would begin in coming weeks with the first report due in 2014, they said. They declined to give details of what the possible consequences of the review might be, but said nothing could be ruled out at this stage.

More details about the review will be set out in the government's annual energy statement presented by Energy secretary Ed Davey next week, they added.

"It will look across the range of issues that can affect competition and consumers--prices, profits, barriers to new entrants...and also how companies work and engage with their customers," Mr. Cameron's spokesman told reporters.

The review met with a mixed response. EEF, a lobby group for the manufacturing sector, said it had long pushed for the government to address the issue of competitiveness in the market.

"This review should be rapid and report back as soon as possible as the rising cost of energy is acting as a block to investment and growth for many companies," Terry Scuoler, the chief executive of EEF, said in a note.

But Friends of the Earth said the best way to protect cash-strapped households is through a comprehensive energy efficiency program and ending the nation's dependency on costly fossil fuels.

Up until now, the government has urged customers to fight rising energy bills by switching suppliers to find the best deals and it has pledged to legislate to force energy firms to give customers the lowest tariff. But commentators say both those ideas were trumped by Mr. Miliband's price freeze plan which hit the share price of some of the energy firms when it was announced.

Mr. Cameron's aides said the government would give more details about green levies in the Autumn Statement, which Treasury chief George Osborne is due to deliver on Dec. 4. The levies account for about 9% of average energy bills, or 112 pounds, but they are expected to rise to about 14% or 194 pounds by 2020, they said.

Efforts to cut these so-called green taxes are likely to put Mr. Cameron on a collision course with the Liberal Democrats, the smaller party in the governing coalition, which has defended them.

Write to Nicholas Winning at nick.winning@wsj.com

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