Thousands of households have been given a one month deadline to claim up to £400 in free cash as part of the Government's cost of living help.
As it stands some £130m remains unclaimed by customers who use a prepayment meter for their energy.
All households were eligible for the Government's Energy Bills Support Scheme, which paid £400 in six instalments of £66 or £67 over the winter. But many prepayment customers have yet to redeem their vouchers.
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June 30 has now been dubbed "Claim Your Energy Voucher Day" and is a final push to encourage the remaining households to claim their vouchers before the scheme ends in a month.
Customers need to visit a post office or PayPoint with their Energy Bills Support vouchers and identification before this date. Any lost, missing or expired vouchers can be reissued, as long as they are redeemed by June 30.
Those on a traditional prepayment meter who have not received the vouchers, or are unsure of how to redeem them, or need a voucher to be reissued, should contact their supplier. Latest figures show the number of vouchers cashed in has reached an all-time high of 83%, with prepayment meter users so far claiming nearly £650 million under the scheme.
Energy minister Amanda Solloway 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 June 30 - there is still £130 million out there to claim."
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