Factbox - Energy price changes by utilities in Britain

(Reuters) - All of Britain's biggest energy companies have announced price increases this year, citing higher wholesale prices and the cost of government policies to support renewable energy generation.

Britain's dominant energy companies have been under scrutiny by the government, which is putting a price cap on standard variable tariffs to combat what it has called "rip off" energy prices.

Energy regulator Ofgem said the cap should be in place by the end of the year.

Below are tariff changes so far this year (in alphabetical order):

BRITISH GAS

Centrica-owned British Gas is increasing its standard variable tariff for electricity and gas by an average of 5.5 percent from May 29.

The move will add 60 pounds ($79) to annual bills for 4.1 million customers on the tariff, raising them to an average of 1,161 pounds, the company said.

EDF ENERGY

EDF Energy, a unit of French utility EDF, said it will increase the cost of its standard dual fuel energy bills by 1.4 percent (or 16 pounds) to 1,158 pounds a year from June 7.

E.ON

E.ON said it would raise the price of its standard dual fuel bill by 4.8 percent from August 16 to reflect higher increases in wholesale and policy costs.

The rise equates to around an extra 55 pounds per year, it said.

NPOWER

Npower, owned by Germany's Innogy, will raise its variable dual fuel bill by 5.3 percent as of June 17, impacting about 1 million customers.

The rise represents a 64 pound increase on annual bills and a direct debit customer on the tariff will typically pay 1230 pounds ($1,633) a year. The hike is made up of average rises of 4.4 percent on gas and 6.2 percent on electricity.

SCOTTISH POWER

Iberdrola-owned Scottish Power said it will raise standard variable domestic gas and electricity prices from June 1 by an average 5.5 percent, or 63 pounds on a typical annual dual fuel bill.

The move will affect around a third of homes supplied by Scottish Power, around 960,000.

SSE

SSE said it would raise the price of its standard dual fuel bill by 6.7 percent from July 11 to reflect sustained increases in wholesale and policy costs.

The rise equates to a typical annual bill increase of 76 pounds and will affect 2.36 million customer of SSE and M&S Energy, which is supplied by SSE.

(Reporting by Nina Chestney, Sabina Zawadzki and Susanna Twidale; Editing by David Evans)