Did your energy firm pocket the £50 'green tax' rebate? Clare Francis of comparison site Moneysupermarket said: "The Government announcement was intended to benefit all bill payers. This is hardly treating customers fairly, and those being penalised are the ones who have done the right thing and taken action against spiralling bills by fixing their energy prices. British Gas is one of two large providers to help customers on fixed tariffs. It announced price rises of 9.2pc last November. These were reduced to 3.2pc on January 1, with smaller reductions for those with a fixed deal. SSE has also promised to pass on the green tax savings to fixed tariffs - but not until March, when the worst of the adverse weather is likely to have subsided. Npower called its decision "fair," as fixed-tariff customers benefit from cheaper rates, while standard tariff customers alone face price rises this winter. A spokesman said: "The design of our fixed tariffs in recent years has always been significantly cheaper than our standard tariff. It's fair that the customers who saw price increases last year should see significant savings now. Ann Robinson, director of consumer policy at uSwitch.com, said: "Suppliers could have made this whole process simpler by cutting prices universally for variable and fixed-price customers. Instead, with the big six cutting prices in different ways, what should have been a simple good news message for consumers has got bogged down in detail and caveats. Consumers yet to lock into a fixed deal should do so, the experts said, as bills are likely to increase again. The smaller suppliers offer the most competitive prices. The cheapest fixed deal on the market currently is First Utility's iSave Fixed July 2015, at an average yearly cost of £1,037. Ovo's New Energy + Ovo Just Reward, fixed for 12 months, costs an average £1,042 a year. Green Star Energy also has a competitive fixed tariff, No Worries 24 Months Fixed, costing an average £1,061 a year.