Octopus Energy and OVO Energy are offering the "most vulnerable" customers free electric blankets to help keep warm this winter.
Eligible customers may find they can reduce their energy costs with the products, by heating themselves rather than the entire home.
Octopus Energy said it is "proactively" offering electric blankets to customers with "really specific vulnerabilities and medical needs"
The supplier said some customers were paying to heat their entire homes, even if they lived alone.
Octopus Energy is 'proactively' contacting some of the most vulnerable customers regarding the free electric blanket scheme
PA
According to their calculations, heating the whole home costs around £4 per day, while an energy-efficient electric blanket can heat a person for just two to four pence per hour. This equates to up to 96 pence per day.
Octopus Energy said: "This means an electric blanket is a vastly more cost-effective way to stay warm: particularly for people with mobility issues, for example, and those who spend a lot of time in one spot.
"Or those with medical issues that mean they feel the cold more, or are more prone to illness."
The energy supplier is not offering blankets to every customer, to try to ensure people who need a blanket the most can get one.
Customers who got an electric blanket saved up to 10 to 20 per cent on their bills on average in winter after getting a blanket - a saving of £300 over a year, Octopus said.
OVO opened its Customer Support Package, totalling almost £40million, to support the most vulnerable earlier this year.
The supplier also announced it was offering free energy-saving products, valued at £1million.
The products available include electric blankets and mattress toppers, LED bulbs and SMART sockets, as well as free boiler servicing.
Octopus Energy said a member of staff will look at the health of an applicant's account and information provided during the application process to inform the decision. Applicants should hear back in around one week.
The energy supplier said they would "proactively" offer electric blankets to customers with "really specific vulnerabilities and medical needs".
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They added: "Customers who apply for our OctoAssist will be assessed and offered the support that&#;ll be most appropriate for them."
To begin the process, customers should create a Paylink budget to see what support is available and find out if they are eligible for financial assistance.
Customers who are struggling with their bills are urged to contact their supplier as there may be other forms of support.
OVO Energy customers can apply for the Customer Support Package online.
It should take around five minutes. Households can only apply once.
Customers will need to know their household's total income, monthly disposable income, and potentially provide up-to-date meter readings in order to submit the application.
With the energy price cap rising and the average annual energy bill for households in the UK rising to £2,500, many are looking at alternative ways of keeping warm this winter.
To help keep its customers cosy, one energy company is giving away thousands of free electric blankets as an alternative to turning on the heating.
Last winter, Octopus Energy gave away 8,000 free electric blankets to its customers, and this number is rising to 10,000 this year.
First and foremost, you will need to be an Octopus Energy customer. The company is also looking to prioritise giving blankets to those who will need them the most.
This includes &#;older people who are struggling with mobility, and those with serious illnesses which can also affect mobility, or mean they are particularly susceptible to the cold&#;.
Those in need should send across their name and address to the provider, who will then ask them to fill out a financial assistance form. The form will ask for information, including how much you earn and spend.
If you are not eligible or do not receive one of the free blankets, Octopus Energy still recommends buying your own.
&#;These blankets start at around £40 and can save you £300 or more, so they&#;re really worth the investment. If you can consider buying one yourself, please do &#; there might be someone else out there who truly can&#;t afford to buy one,&#; a statement from the company said.
According to the company, an electric blanket costs just 2 to 4p per hour to run, while heating a home can cost £4 a day.
It analysed 4,190 of its customer&#;s energy data and found that customers with an electric blanket cut between 10 and 20 per cent off of their energy bills.
The company also urged those with an electric blanket to be aware of the Fire Brigade&#;s guidance towards using one and that, to prevent mould, to keep the temperature in your home above 15 degrees Celsius.
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