Around one in five households with prepayment gas and electricity meters have still to redeem their energy rebate vouchers, according to the non-profit organisation Advice Direct Scotland.
PayPoint sent out hundreds of thousands of vouchers in November but they are only valid for 90 days – meaning those issued in November have now expired.
Most households will have £400 automatically taken off their electricity bills in six instalments, or have the money added to their accounts.
However, those on traditional prepayment meters need the vouchers to get the discount.
PayPoint said that 79% of customers have so far redeemed their December vouchers, which have a deadline of March 08.
Almost one in five households in Scotland use prepayment meters for their gas or electricity.
Customers who have not yet redeemed their January vouchers have until April 09.
Kenneth Gibson MSP said
“If you have a pre-payment meter please make sure you are not missing out on this support.
“Check unopened mail, in case the vouchers have been missed and get in touch with energy suppliers, using contact details found on bills, statements, and official websites.
“If there are any difficulties getting through to suppliers or resolving issues, please contact energyadvice.scot
“The team can be contacted on 0808 196 8660 (Monday to Friday, 9am-5pm), or through www.energyadvice.scot”