British Gas owner Centrica should "exercise restraint" with tarriffs after profits from its residential energy arm rose by 3.2% to £356 million, an energy minister said.
The supplier cashed in on the freeze in the first half of the year after raising tariffs by 6% in December.
Michael Fallon said: "What matters is not just the profits, it's the prices that we all have to pay and there was a big price increase just before last winter, over 6%, so I would hope that Centrica would now exercise restraint and that we are not going to see similar price jumps."
Despite the announced profits increase, British Gas owner Centrica would not rule out further rise in tariffs this winter, blaming "upward pressure on costs".
We will keep prices as low as we can for as long as we can. If prices do have to go up, we will delay it for as long as possible.
– Centrica's finance director Nick Luff
Mr Luff said the Government-backed ECO (Energy Companies Obligation) scheme, which helps customers with boiler repair or replacement or insulation costs, would "inevitably impact on customer bills ultimately".
Britain's bitterly cold winter boosted the profits of British Gas owner Centrica after the company raised tariffs by 6% in December.
The rise in profits, from £345 million in the same period last year, is likely to spark anger despite the company pledging to halt further tariff hikes.
Campaigners have called for the company to go further and cut prices.
Centrica chief executive Sam Laidlaw said: "With our customers using more gas to stay warm during the unusually cold winter, we're doing everything we can to help them keep their energy costs under control and make bills simpler and clearer."
Energy firm Centrica is expected to announce pre-tax profits rose 1.4 percent to £350 million compared with the same period last year for its British Gas residential arm.
The forecast rise does not entirely reflect gains from heavy winter gas usage, which are likely to have been offset by the cost of a new obligation to deliver energy efficiency measures in customers' homes, Deutsche Bank analysts said.