Some 22 million people on default tariffs will see energy bill rises of 54% from 1 April this year - part of a growing . Even if you're on a fixed price tariff, you could find prices are far higher when you come to renew.
The Which? Money Podcast has talked to people affected by rising bills and heard from experts on what you can do.
Here we've rounded up those tips, dividing them into actions you can take , and , with a verdict from .
And if you can't pay your bills, .
The first thing you can do is head over to your thermostat and turn it down. Twisting the dial just one degree could cut your bill by around 10%, according to the Energy Saving Trust (EST). In January, we heard that more than half of consumers have been using less heating to save money.
It's worth doing a bit of online research. If you're on a low income or you receive a certain pension credit, you might be eligible for the government's - which cuts £140 from your electricity (or in some instances gas) bill between October and March each year.
Finally, dig out your paperwork to see whether you're out of contract, or on a default tariff, with your energy supplier.
Contact your supplier as soon as possible. It's required to help you come to a solution, such as one of the following:
Now onto the things that'll take a little longer.
Next time you're doing housework, run all appliances on their 'eco' setting if you don't do so already.
Wash laundry at the lowest temperature you can: can be enough in some cases, particularly if you use liquid detergent. Try to dry clothes on a rack instead of in a tumble dryer; if you do use a dryer, clean its filter first to improve efficiency.
These cost around £7 less a year to run than traditional halogen bulbs. And they last more than ten times longer, so you won't have to buy new ones as often, either.
The EST says draught-proofing could save you £25 a year. This will add up over the years, but if you're more concerned about short-term savings, make sure it doesn't cost you more than you save.
Finally, these are the tips you can think about trying over a longer period.
When your current energy deal expires one of the most important things you can do is to get the lowest-priced tariff possible. Though there are fewer cheap deals than previously, it's still worth looking.
Insulating your loft and walls could cut £290 from your bills. But the savings will depend on the size of your home. This calculation was based on people who live in a three-bedroom, semi-detached house.
Lisa Barber, Which? home products and services editor.
We know people are already struggling to pay their bills due to the rising cost of living.
The government's support measures need to be judged on whether financial help is getting to the most vulnerable. Many more people will be dragged into fuel poverty once prices rise in April, so the government and energy firms should ensure that support reaches those who need it ahead of this.
At Which?, we'll be focusing on the real ways you can make a difference to your cost of living over the coming months - and what government and businesses should be doing to help.