Centrica chief executive Chris O’Shea has advised consumers the energy crisis may last for two years.
Speaking to the BBC, Mr O’Shea said “the market suggests” high gas prices will continue “for the next 18 months to two years”.
He said the high demand for gas was partly being driven by a move away from coal and oil.
“And so as you turn off coal-fired power stations in other countries, there isn’t an abundance of gas that you can just turn on quickly.”
But Mr O’Shea also threw cold water on the idea of boosting supply from the North Sea as a domestic solution to the crisis.
“I’m not sure an increase in UK supply would have brought the price down from £3 a therm, as it was in December, from 50p as it was a year ago,” he said.
“We bring gas in from the United States, from Norway, from Europe, from Qatar, from other places. So we’re not in a position to simply have the UK as an isolated energy market. We are part of a global market.”
Prime Minister Boris Johnson is reportedly backing a plan being developed by Business Secretary Kwasi Kwarteng for state loans to firms threatened with closure over the winter.
The move follows an extraordinary Whitehall turf war between Mr Kwarteng and Chancellor Rishi Sunak, which broke out over the weekend, with the Treasury denying there any plans for the Government to act.