Good Energy has promised to freeze its electricity and gas prices this winter.
It claims to be the first supplier in the country to do so.
Some energy suppliers have begun to increase their prices for winter 2016/17 due to rising demand for heating, according to the green firm.
Good Energy said its average yearly dual fuel tariff stands at £1,069 and customers won’t see their prices rise until March 2017.
However according to uSwitch, the tariff remains around £240 more expensive than the cheapest green plan on the market from rival Octopus Energy.
David Brooks, Good Energy’s Managing Director said: “We’re freezing our gas and electricity price this winter to give our customers peace of mind and no nasty shocks. When it’s colder and darker, most will need to turn the lights and heating on for a bit longer each day. Customers won’t thank their supplier for hiking up the price at the time of year when they’ll be using it most.”