Grid costs overtake wholesale gas as UK power bill driver
Network upgrades and subsidies are pushing UK household electricity bills higher, overshadowing volatile gas costs and raising questions about how the energy transition is funded.
The UK government plans to cut VAT on domestic electricity from 5% to zero this October, yet British consumers will still pay some of the highest power prices in Europe. In the second half of last year, medium-use UK households paid the fourth-highest electricity prices in the region when including taxes and levies.
For investors and utilities, the significance lies in a structural shift within the bill itself. Network costs have surged from £136 in 2019-20 to an estimated £250 in 2026, an increase of £113. By comparison, the wholesale energy cost contribution rose only marginally, from £311 in 2024-25 to £320 in 2025-26.
This infrastructure spending is driven by the need to connect new wind and solar farms to the national grid. "We've probably underinvested in the last decade and now we're trying to catch up so there's quite a lot of spending," says Frankie Mayo, an energy analyst from Ember Energy. Analyst Ben James projects network costs will add another £48 to a typical bill by 2030.
Wholesale prices remain elevated due to the UK's marginal pricing mechanism, where the most expensive generator needed to meet demand sets the price for all power produced. Because the UK generated 31% of its electricity from natural gas in 2025, gas frequently acts as this price-setting fuel. This exposes the UK to international gas volatility driven by the wars in Ukraine and Iran, unlike France, which relies on nuclear for 69% of its power.
Generation subsidies for renewables have also added £32 to typical bills since 2019-20, rising from £127 to an estimated £159 in 2026. The US generates a higher share of power from gas at 40%, but avoids similar bill impacts because its wholesale gas prices remain suppressed by decades of shale production.
The government contends its 2030 clean power policy will eventually lower wholesale costs by reducing the instances where gas sets the market price. However, the method of recovering transition costs is drawing scrutiny from regulators and analysts.
The Climate Change Committee has recommended moving policy costs from electricity bills to general taxation to avoid discouraging consumers from switching to electric heating. "The way you allocate those costs matters," says Mayo. "They may be being put on bills or they may be being paid by consumers in other ways that are less visible, such as taxes."
