Scottish and Southern Energy has become the last of the UK's six main suppliers to increase fuel bills as it hit customers with double-digit price hikes.
The group confirmed it would raise tariffs by an average of 14.2% for electricity and 15.8% for gas from April 1.
Scottish and Southern - which has 8.5 million customers - said the move came as it has faced "stubbornly high" wholesale energy costs.
Households have been hit by a swathe of energy price increases this year as suppliers seek to pass on the wholesale rises.
In January, Npower became the first of the "big six" to hike costs, and was soon followed by EDF and British Gas, which announced tariff rises in the same month.
Scottish and Southern had pledged to freeze its energy prices until the end of March, but said that it was forced into the decision as wholesale electricity costs have soared 90% and gas by 100% since March last year.
Alistair Phillips-Davies, energy supply director of Scottish & Southern, told the group's customers that he was "sorry".
He said: "Energy supply in the UK is changing dramatically, with companies having to operate in volatile markets, which reflect depletion of North Sea oil and gas fields, soaring global demand for all types of energy and over 100 US dollars a barrel for oil.
"These pressures are compounded by the rising transmission, distribution and environmental costs, which suppliers have to meet.
"You cannot resist indefinitely the impact of these issues and I am sorry that all of this has culminated in the price rises we are
The group confirmed it would raise tariffs by an average of 14.2% for electricity and 15.8% for gas from April 1.
Scottish and Southern - which has 8.5 million customers - said the move came as it has faced "stubbornly high" wholesale energy costs.
Households have been hit by a swathe of energy price increases this year as suppliers seek to pass on the wholesale rises.
In January, Npower became the first of the "big six" to hike costs, and was soon followed by EDF and British Gas, which announced tariff rises in the same month.
Scottish and Southern had pledged to freeze its energy prices until the end of March, but said that it was forced into the decision as wholesale electricity costs have soared 90% and gas by 100% since March last year.
Alistair Phillips-Davies, energy supply director of Scottish & Southern, told the group's customers that he was "sorry".
He said: "Energy supply in the UK is changing dramatically, with companies having to operate in volatile markets, which reflect depletion of North Sea oil and gas fields, soaring global demand for all types of energy and over 100 US dollars a barrel for oil.
"These pressures are compounded by the rising transmission, distribution and environmental costs, which suppliers have to meet.
"You cannot resist indefinitely the impact of these issues and I am sorry that all of this has culminated in the price rises we are
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