30th September 2026
British households have not even reached the October energy price rise yet, but there is already another increase looming on the horizon.
Ofgem has confirmed that the energy price cap will rise by 4% from 1 October, taking the annualised bill for a typical household paying by direct debit from £1,663 to £1,723. The increase is being driven mainly by higher wholesale gas prices, with the continuing conflict in the Middle East adding to volatility in international energy markets.
But the bigger concern may be what happens in January.
Cornwall Insight's latest forecast puts the January to March 2027 price cap at £1,872, an increase of about 9% compared with the October cap. That would add another £149 to the annualised cost for a typical household. The figure is a forecast rather than a confirmed price, with Ofgem not due to announce the January cap until November.
And that uncertainty is important because energy markets are currently exceptionally volatile.
Cornwall Insight says wholesale energy prices account for more than 40% of the price cap. It points to the continuing uncertainty surrounding the Middle East conflict, disruption to supplies, strong Asian demand and relatively low European gas stocks as factors keeping wholesale prices elevated.
In other words, the January figure is not a ceiling on what could happen. It is a snapshot based on wholesale market prices at the time the forecast was made.
That is why some of the other forecasts circulating are considerably higher.
The Independent has reported forecasts suggesting that household energy bills could rise by more than £400 over the course of 2027 if wholesale gas prices remain elevated. Other analysts have also warned of a much larger January increase than Cornwall Insight's current central forecast.
We therefore need to be careful about headlines claiming that bills definitely will rise by 25% or 30%.
They may not.
But the direction of travel is worrying.
The October increase is already taking place, and the latest Cornwall Insight forecast suggests another increase in January. At the same time, wholesale gas prices remain vulnerable to events outside Britain's control.
This matters because Britain remains heavily exposed to the international gas market.
It is sometimes assumed that because Britain produces some oil and gas in the North Sea, domestic households should be protected from international price movements. Unfortunately, that is not how the market works. Gas is traded internationally, and higher wholesale prices feed into the cost paid by British suppliers.
For households using gas for heating, the problem is particularly significant.
Ofgem says that although the Government's removal of VAT from domestic electricity bills has helped, higher wholesale gas prices are responsible for most of October's increase. Gas costs are rising by around 8%, while households that do not use gas will see a much smaller increase in their October cap.
That creates a rather strange situation.
Britain is trying to move towards an electricity-based energy system, with heat pumps, electric vehicles and increasing renewable generation, yet gas prices can still have a substantial influence on household energy costs.
And the consequences do not stop at the energy bill.
Energy is an input into almost everything.
A bakery uses electricity and gas. A supermarket needs refrigeration and lighting. A farmer uses fuel and electricity. A factory needs energy to manufacture goods. A warehouse needs heating and electricity. Lorries use diesel. Businesses then pass some of those additional costs through the supply chain.
That means another significant energy increase in January could feed into prices for food, transport, services and manufactured goods.
It could also have an effect on employment.
Businesses already facing weak consumer demand may be reluctant to absorb another round of higher costs. Some will increase prices. Others may reduce margins, cut investment or look for savings elsewhere.
That brings the energy story back to something else we have been seeing in Britain and America: declining confidence.
American consumer confidence has recently fallen sharply, while vacancies have weakened. Britain is experiencing its own decline in job vacancies and continuing pressure on household budgets.
People do not necessarily need to lose their jobs to feel poorer.
If their wages remain broadly unchanged while energy, food, transport and other essential costs increase, they simply have less money available for everything else.
That can become a problem for the wider economy.
A household postpones buying a new sofa. Another delays replacing its car. Someone decides not to eat out. A family cuts back on holidays. A small business sees fewer customers and becomes more cautious about employing another member of staff.
One household doing this makes little difference.
Millions doing it can have a substantial effect.
This is why the January energy forecast deserves attention even though the final figure has not yet been decided.
The £1,872 Cornwall Insight forecast could move down if wholesale gas prices fall significantly before Ofgem sets the cap. It could also move upwards if international energy markets deteriorate further.
The Government therefore faces an awkward situation going into the Budget.
It needs economic growth, but households are already under pressure. It needs businesses to invest and employ, but businesses are facing higher costs. And it needs to keep inflation under control while energy prices remain vulnerable to events beyond Britain's borders.
There is another important point for households in rural areas such as Caithness.
The official price-cap figure represents a typical dual-fuel household. It does not mean that every household will pay £1,723 or £1,872.
A household using more energy will pay more. A household using less will pay less. And households relying on heating oil are not protected by the domestic gas and electricity price cap at all.
That is particularly relevant in rural Scotland, where heating oil remains an important source of household heating.
So while the £1,872 forecast should not be treated as a prediction carved in stone, it is a warning.
The October increase is coming.
Another increase in January is currently expected.
And if international gas prices remain high, the January figure could move considerably before Ofgem finally announces it.
The worrying part is not simply another £149 on an annualised energy bill.
It is what happens when energy prices, food prices, transport costs and other household expenses all move upwards together.
That is when an energy-price problem becomes a cost-of-living problem.
And eventually, a cost-of-living problem can become an economic-growth problem.
The worst may not be over.
VAT is being removed from 1 October but goven the huge rises not many will notice that in ever rising bills.