Back in August, the industry regulator set the energy price cap at £1717 for the average customer, an increase of 10% or around £12 per month on average.

Ofgem said at the time that the rise was largely due to higher wholesale gas prices and it urged bill-payers to “shop around” as there are fixed-rate deals on the market that could offer savings.

Citizens Advice Scotland’s energy spokesperson Matthew Lee said: “Just as temperatures start to fall, energy bills are shooting up. It’s a harsh reality for many people across Scotland, particularly as it coincides with changes to the eligibility rules for the Winter Fuel Payment, meaning tens of thousands will miss out on that. The result is that many homes face a cold, dark and miserable winter.

“The broken energy market badly needs reform, and the UK and Scottish governments both need to look again at the support that is available to low income households.

“Energy companies too should play their part by offering a social tariff for those on low incomes. Some have already done this but we need it to become the norm across the industry. And we also need more write-off schemes for people who are deep in energy debt with no way of repaying it.”

“Meanwhile the Citizens Advice network is ready to help anyone who is worried about how to keep their home warm this winter. Our advice is free, confidential and impartial.”