A surge in wholesale costs driven heavily by expensive gas is responsible for nearly 90% of the rise in UK household electricity bills since 2020, according to new analytical data shared with climate and energy media.

The figures, compiled by the sustainable future thinktank Nesta, reveal that wholesale gas costs are also behind the vast majority—specifically 77%—of the overall increase in household gas bills over the same timeframe. This comprehensive breakdown directly challenges a prevailing narrative that has become firmly embedded across UK media outlets and political discourse, which frequently places the blame for high domestic energy bills squarely on the nation’s legally binding net-zero targets and green energy policies.

Andrew Sissons, the director for sustainable future at Nesta, explained that net-zero initiatives are actually working to shelter Great Britain from the worst impacts of volatile and expensive fossil fuels. He noted that rising global gas prices, rather than the transition to a green economy, have driven the vast majority of the recent surge in the country’s energy bills. Furthermore, Britain remains particularly exposed to these market shocks because more than 80% of households are connected to the gas mains, while the domestic electricity system still relies too heavily on gas as the marginal unit to balance power supplies.

This new analysis arrives closely on the heels of the UK government’s official approval for the Jackdaw gas field development in the North Sea. Ministers gave the project the green light despite previously acknowledging that its development would not have a meaningful downward effect on consumer energy prices.

The latest findings build upon previous reports, such as research highlighted by Carbon Brief in January 2026, which revealed that two-thirds of the increase in electricity bills since the onset of the 2022 global energy crisis was directly attributable to high gas costs. Today, amid ongoing geopolitical conflict in the Middle East and associated disruptions near critical shipping channels like Hormuz, wholesale gas prices have climbed back to their highest levels since Russia’s invasion of Ukraine in 2022.

As of October 19, UK wholesale gas standing prices reached 220p per therm, equivalent to approximately £75 per megawatt hour. This exceeds the average wholesale gas price recorded throughout the volatile market conditions of 2022, which sat at 210p per therm, or roughly £72 per megawatt hour.

Economic modeling and inflation-adjusted figures demonstrate that typical UK annual household electricity bills rose by £180 by the fourth quarter of 2026, relative to the exact same period in 2020. Out of this total increase, roughly 90%—amounting to £161—is directly tied to wholesale costs dictated by the price of gas.

In stark contrast, and defying widespread public perception, renewable energy contracts known as contracts for difference (CfDs) are actually helping to reduce electricity bills by £17 under the current price cap regime, according to Nesta’s assessment. Moreover, the government has moved to cut policy costs associated with electricity by shifting 75% of legacy renewable support onto general taxation, terminating the Energy Company Obligation efficiency scheme, and temporarily removing value-added tax.

Network costs have meanwhile added £72 to typical household bills since 2020. The lion’s share of this network increase—some £46—represents necessary investments in the high-voltage electricity transmission network, often described as the backbone or motorways of the national grid. By comparison, only £21 of the rise in network costs relates to balancing the system. This balancing figure includes constraint payments made to wind farm operators to temporarily power down turbines when local grid capacity is insufficient, forcing the system to turn on alternative gas-fired power plants instead.

Although wind constraint payments receive extensive news coverage across national newspapers and broadcast media, total system balancing costs make up just £35, or roughly 4%, of a typical £858 annual household electricity bill.

Energy supplier operating costs have also risen by £46 since 2020. While these operational figures are not broken down in detail within underlying data from the industry regulator Ofgem, analysts believe the increase is largely driven by the mounting burden of household energy debt. At the same time, supplier profit margins remain strictly capped at 2.5% of overall consumer bills.

Another Gas Crisis and Breaking the Link

Notably, household electricity prices have increased far less rapidly since the Hormuz crisis than direct household gas bills. Higher volumes of domestic clean-energy generation have played a crucial role in breaking the traditional link between the two commodities, shielding consumers from the worst of the electricity spikes.

Since 2020, household gas bills have increased by £368 in real terms, with roughly 77% of that increase—or £283—driven purely by wholesale gas costs. When accounting for inflation, total dual-fuel bills for a typical British household have climbed from £1,175 per year in October 2020 to £1,723 per year by October 2026, representing a cumulative increase of 47%.

Rising wholesale costs driven by high gas prices account for £444, or 81%, of this overall dual-fuel increase in real terms. Meanwhile, the real-terms rise of £127 in network costs includes £72 for electricity transmission, distribution, and balancing, alongside £55 for ongoing investments required to maintain the safety and integrity of the gas distribution grid.

According to the Energy Networks Association, up to 80% of total investment in electricity grids is strictly required simply to maintain and upgrade existing aging assets, with the remainder dedicated to expanding capacity for the net-zero transition.

The broader composition of household energy bills has shifted significantly over the past six years. The cost of government-mandated social and environmental policies made up £183, or 16%, of a typical dual-fuel bill back in October 2020. By the time of the October 2026 price cap, that figure had fallen to £114, representing just 7% of the total bill.

Wholesale costs now make up the single largest share of the current price cap, standing at £757 or 44% of the total. Network costs follow as the second-largest component at £417, or 24%, while supplier operating costs account for £291, or 17%.

Reflecting on these findings, Sissons emphasized that upgrading the national grid is not a cost-neutral endeavor, but that the price tag is ultimately dwarfed by the punishing financial impact of rising international gas prices.

"In fact, net-zero is helping to shelter Britain from the impact of expensive gas," Sissons said. "Since the start of the Iran conflict, electricity bills have begun to decouple from gas bills, thanks to the UK’s increased renewable power and support from contracts for difference."

Sissons argued that progressing further down the path of decarbonization will require British households to adopt clean electricity sources, electric vehicles, and efficient heat pumps to replace polluting fossil-fuel cars and gas boilers. By intentionally focusing on growing overall electricity demand, the government can spread necessary grid upgrade costs more widely across the consumer base, locking in consistent investment in electrification as the most reliable strategy to insulate winter energy bills from global political and economic turmoil.

Media reports indicate that the chancellor may take deliberate steps to assist vulnerable households and struggling businesses cope with mounting energy costs during the upcoming budget announcement. Meanwhile, consumer watchdogs and market analysts warn that domestic bills are expected to rise sharply under the forthcoming January price cap—potentially surging by as much as a quarter—as the ongoing pressures of high wholesale gas prices continue to filter through the retail market.