People are being urged to submit an electricity meter reading to their energy supplier at the end of this month.
The warning comes as energy prices are set to see further price hikes in October as the price cap changes once more. While the new Prime Minister Liz Truss has announced the Government would guarantee the average household will pay no more than £2,500 in energy bills from October 1, this is still a considerable jump from the same time last year.
In April, Money Saving Expert's Martin Lewis and other financial experts recommended that everyone take a manual meter reading the day before the price hike. This was so that your energy supplier would know exactly how much energy you used before the new rates were introduced to prevent you from being overcharged.