A massive one hundred million pounds worth of Energy Bills Support Scheme vouchers are still waiting to be claimed.
Some of the most vulnerable households can still benefit from the £400 energy bill discount, but they must act quickly before the June 30 deadline.
While all homes with a domestic energy connection will automatically receive the payments, those on a pre-payment meter need to take action to claim vouchers that come each month via text, email or post.
National Energy Action are urging those who are eligible to contact their electricity suppliers as soon as possible.
Some of the most vulnerable households are yet to receive the help.
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Adam Scorer, executive chief of the fuel poverty charity, said: "As energy bills have spiralled, National Energy Action knows how crucial the Government's Energy Support Scheme has been.
"The £400 paid in six instalments of £66 or £67, has helped many people this winter. But prepayment customers - often some of the most vulnerable - were paid in vouchers and millions remains unclaimed.
"We urge anyone who hasn't yet claimed their vouchers to do so before the June 30 deadline and, if you have friends and family that may not have used their vouchers, spread the word.
"It may be the support that keeps their lights on, their oven cooking, their hot showers running, through the summer. It's vital money at a time when it's never been needed more."
Take any redeemable vouchers to a Post Office or PayPoint to claim the discount.
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According to NEA the poor take up is due to lack of awareness rather than need. They are keen to spread the word so as many people can get help as possible.
London has had the fewest redemptions, leaving more than £650,000 of vouchers unclaimed at the end of March.
To claim your vouchers, Britons need to take them to either a Post Office or a PayPoint shop to add it to your top-up key or card.
Remember to bring proof of ID or address such as a bank statement or UK driving licence when you go to claim.
Minister for Energy Consumers and Affordability, Amanda Solloway, said she was pleased with the positive impact so far, but still she wants more people to receive the benefit.
She said: "We’ve made huge strides in getting nearly £650 million from our Energy Bills Support Scheme out to prepayment meter customers, often in the homes that need it most."
"Today we are redoubling our efforts to reach anyone who still hasn’t claimed this help, and it’s fantastic to see so many join our final push to spread the word."
"Tell friends and family or anyone on a traditional prepayment meter to use their vouchers for up to £400 off bills before 30 June – there is still £130 million out there to claim."
