A new economic analysis has revealed that a dramatic surge in wholesale costs, overwhelmingly driven by expensive gas, is responsible for nearly 90% of the overall rise in UK household electricity bills since 2020.

The figures, shared with Carbon Brief by the prominent thinktank Nesta, directly challenge a narrative that has become deeply embedded across UK media and political circles: the widespread belief that the nation’s legally binding net-zero carbon targets are the primary driver behind punishingly high household energy bills.

According to the comprehensive data, wholesale gas costs are also behind the vast majority—specifically 77%—of the overall increase in household gas bills over the same period.

Andrew Sissons, director for a sustainable future at Nesta, told Carbon Brief that net-zero policies are, in practice, performing the exact opposite function of what critics claim. Rather than inflating household expenses, clean energy frameworks are actively shielding Britain from the full brunt of volatile and expensive fossil fuel markets.

"Rising gas prices, not net-zero, have driven most of the recent surge in Britain’s energy bills," Sissons explained. He noted that the UK remains acutely vulnerable to international market shocks due to structural dependencies. "Britain is particularly exposed, with over 80% of households connected to gas mains, while our electricity system still relies too much on gas as the marginal unit."

The release of this analysis coincides with a controversial decision by the UK government to grant formal regulatory approval for the development of the Jackdaw gas field in the North Sea. This authorization moved forward despite government acknowledgements that the project would ultimately fail to alter consumer energy prices meaningfully.

Another Gas Crisis

The current economic pressures echo the structural vulnerabilities exposed during the 2022 global energy crisis. Earlier in January 2026, research published by the UK Energy Research Centre and highlighted by Carbon Brief demonstrated that two-thirds of the cumulative rise in electricity bills since the pre-crisis era stemmed directly from elevated gas prices.

Today, compounding geopolitical tensions—notably the ongoing conflict in the Middle East and turmoil around vital shipping lanes near the Hormuz strait—have pushed wholesale gas prices to heights not witnessed since Russia’s 2022 invasion of Ukraine.

Market tracking data indicates that UK wholesale gas prices recently hovered at roughly 220p per therm, equivalent to £75 per megawatt hour. This figure sits comfortably above the full-year average seen during the acute crisis of 2022, which averaged 210p per therm or £72 per megawatt hour.

When accounting for inflation, typical UK annual household electricity bills increased by £180 by the final quarter of 2026, relative to the baseline set in the same period in 2020. The Nesta breakdown shows that an overwhelming 90% of this specific financial increase—translating to £161—is directly attributable to wholesale costs dictated by the global market price of gas.

In stark contrast, and defying widespread public perceptions, renewable energy mechanisms such as Contracts for Difference (CfDs) are actually shaving £17 off electricity bills under the current regulatory price cap.

Furthermore, government interventions have actively reduced policy-related costs embedded in electricity pricing. Westminster shifted 75% of legacy renewable support obligations directly onto general taxation, formally wound down the Energy Company Obligation (ECO) efficiency scheme, and temporarily removed Value Added Tax (VAT) from domestic energy supplies.

Network infrastructure costs have added a more modest £72 to typical bills since 2020. The majority of this increase—some £46—funds vital investments in the high-voltage electricity transmission network, frequently described as the "motorways" of the national grid.

By comparison, only £21 of the rise in network expenses relates to operational system balancing. This category includes constraint payments made to wind farm operators to temporarily power down turbines, alongside the cost of firing up alternative gas plants when local grid transmission capacity proves insufficient.

Although wind constraint payments frequently attract extensive national media coverage, total system balancing costs make up a very minor share of household expenses, accounting for just £35, or roughly 4%, of a typical £858 annual household electricity bill.

Meanwhile, energy supplier operating costs have grown by £46 since 2020. While underlying regulatory data from Ofgem does not provide a granular breakdown of these operational increases, industry experts attribute the rise largely to the expanding financial burden of household energy debt. Supplier profit margins remain legally capped at 2.5% of total bills.

Breaking the Link

A critical finding of the Nesta research is that household electricity prices have climbed at a noticeably slower pace than standalone gas bills since the emergence of the Hormuz crisis. This divergence highlights how higher volumes of domestic clean-energy generation are gradually helping to break the historical pricing link between electricity and gas.

Since 2020, household gas bills have surged by £368 in real terms. Nesta’s analysis confirms that 77% of this increase—amounting to £283—is driven purely by wholesale gas expenditures.

When combining both commodities, total dual-fuel bills for a typical household have escalated from £1,175 per year in October 2020 to £1,723 per year by October 2026, representing a cumulative rise of 47%. Wholesale cost hikes driven by high gas prices account for £444, or 81%, of this real-terms dual-fuel increase.

Real-terms network costs have climbed by £127 overall, encompassing £72 for electricity transmission, distribution, and balancing, alongside £55 dedicated to maintaining and upgrading the national gas grid infrastructure. According to the Energy Networks Association, up to 80% of current investment directed into electricity grids is necessary simply to maintain existing physical assets, with the remainder financing expansion required to meet net-zero objectives.

Government social and environmental policy levies accounted for £183, or 16%, of a typical dual-fuel bill in October 2020. By the implementation of the October 2026 price cap, that policy burden had fallen to £114, representing just 7% of total costs.

Presently, wholesale costs constitute the single largest component of the energy price cap at £757, or 44% of the total bill. Network expenses represent the second-largest component at £417, or 24%, followed by supplier operating costs at £291, or 17%.

"Upgrading the grid is not cost-neutral, but that price tag is dwarfed by the impact of rising gas prices," Sissons emphasized. "In fact, net-zero is helping to shelter Britain from the impact of expensive gas. Since the start of the Iran war, 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 addressing the root causes of high energy expenses requires accelerating the transition toward a fully electrified economy. This means encouraging households to adopt clean electricity, electric vehicles, and efficient heat pumps to replace fossil-fuel-burning cars and gas boilers.

"By focusing on growing electricity demand, the government can spread upgrade costs more widely," Sissons concluded. "This can lock in the consistent investment in electrification that is Britain’s best path to stop global turmoil showing up on winter energy bills."

With media reports indicating that the chancellor is weighing significant financial interventions to assist vulnerable households and businesses, attention is turning toward the upcoming autumn budget. Market forecasters warn that consumer energy bills are poised to climb sharply under the upcoming January price cap, with potential increases reaching as high as a quarter should wholesale gas prices remain elevated.