SSE has become the latest "big six" energy supplier to raise its prices.
The company will increase electricity prices by 15% from 28 April for 2.8 million customers. However, it will keep its gas prices unchanged.
SSE says the price rise is the first for three and half years.
It blamed the increase on government policies which compel firms to buy electricity from renewable sources and to pay for the installation of smart meters.
Rival energy suppliers Npower, EDF, Scottish Power and E.On have all announced price increases recently.
Will Morris, SSE's managing director for retail, said he "deeply regretted" having to put up prices.
"This is the first increase since 2013 and we've worked hard to keep them down for as long as possible by cutting our own costs, putting in place a winter price freeze and holding gas prices, but we have seen significant increases in electricity costs which are outside our control," he said.
"Without an increase we would have been supplying electricity to domestic customers at a loss."