The forecast, published on Wednesday by Cornwall Insight, marks a further blow to struggling households already grappling with high living costs. The cap increase, which would take effect from January, is driven largely by rising wholesale gas prices linked to the ongoing conflict involving Iran in the Middle East.
According to the analysts, the typical dual-fuel household would see an annual increase of £276 under the new cap level. This would represent the steepest quarterly rise since the start of 2023, when the cap was at its peak following Russia's invasion of Ukraine.
The energy price cap, set by regulator Ofgem, limits the amount suppliers can charge per unit of energy for customers on default tariffs. While the cap has fallen from its 2023 highs, the latest projection suggests that geopolitical instability is once again exerting upward pressure on energy markets.
Cornwall Insight's figures are based on forward wholesale prices and exchange rates. The final cap level, which will be announced by Ofgem later this autumn, could differ if market conditions change before the announcement.