Autumn Budget 2026: a Sustainability Stocktake

A headline energy-related piece of the Budget is the £2.6 billion Household Energy Payment. From January 2027, eligible households in council tax bands A to D in England will receive a £100 rebate, with funding for comparable support available for other parts of the UK. Zero VAT on domestic electricity—introduced in October—is also extended until 1 July 2027, which the government estimates will take around £50 off the annual Ofgem price cap in April.

The measures will be funded by temporarily increasing the Bank Corporation Tax Surcharge from 3% to 6% for 15 months, ending on 31 March 2028. It is notable that the principal household energy intervention is being funded through a targeted business-tax increase rather than by adding further charges to consumer bills.

The abolition of gas standing charges is more structural. Around 23 million homes are expected to be affected. The government estimates that approximately 60% of account-holding households will save an average of £45 a year, although the underlying fixed costs will not disappear: they will instead be incorporated into the unit price of gas.

Moving costs from a fixed daily charge to the unit rate increases the financial reward for using less gas. But it may also increase costs for some higher-use households, including those living in larger, colder or poorly insulated homes. The promised protection for vulnerable households will therefore be an important balancing factor.

The VAT decision also contains an understated but potentially helpful sustainability signal. Electricity is taxed at zero while gas continues to attract VAT. Although temporary and relatively small, it does improve the relative economics of electric heating and transport compared with fossil-fuel alternatives. That said, the electric vehicle industry will be disappointed that the government is maintaining VAT on electricity drawn from public (rather than domestic) chargers.

That said, the overwhelming purpose of these measures is affordability rather than decarbonisation. A £100 payment protects households from high energy prices; it does not reduce the amount of energy their homes require or their exposure to fossil-fuel volatility in future winters, and is unlikely to be enough to meaningfully incentivise improvements to less energy-efficient homes. That tension is sharpened by the Budget’s treatment of the Warm Homes Plan. The government is reducing capital grant funding under the Plan by £1 billion as part of its wider spending reprioritisation. The Boiler Upgrade Scheme will continue, preserving the £7,500 grant offer, but its budget will be held at £400 million in 2027-28 rather than rising to the £600 million previously planned for that year. Funding thereafter is expected to increase broadly in line with inflation, rather than following the earlier trajectory of £683 million in 2028-29 and £709 million in 2029-30.

The new Warm Homes Loan Scheme provides a partial counterweight. It offers government-supported low-interest and no-interest finance for technologies including heat pumps, solar panels and batteries, allowing households to spread installation costs over a longer period. That may improve accessibility for owner-occupiers and landlords with sufficient borrowing capacity. It is, however, a materially different intervention from grant funding: it transfers more of the cost and financial risk to the householder and may be less accessible to households in fuel poverty or with constrained credit.

The tax treatment also moves in two directions. While the temporary zero rate on domestic electricity is extended, the existing zero rate for the installation of qualifying energy-saving materials, including insulation, solar panels and heat pumps, is not extended beyond 31 March 2027. Those installations will revert to the reduced VAT rate of 5% from 1 April 2027. The overall package therefore provides substantial short-term help with energy bills, but reduces some of the support intended to lower household energy demand and fossil-fuel exposure permanently.

That makes the interaction with home efficiency and electricity-market reform crucial.

The Budget’s most consequential sustainability measures may ultimately be those that attracted fewer immediate headlines. The first of those is the promise by the government of a comprehensive Cost Control Framework at the 2027 Spending Review, which is intended to set budgets for the different policy components of energy bills over the following decade. Until that framework is in place, no further policy costs will be added to bills unless they reduce bills or are essential to maintaining security of supply. This could be helpful if it brings greater transparency, stops inefficient interventions and makes clear which costs should sit on bills and which should be funded through progressive taxation.

It could be less helpful if it becomes a hard political ceiling that prevents the government from making the investments needed for the transition. A reference has been made to buying only clean power that is both cheap and ready to connect in the Contract for Difference Allocation Round 8, which appears sensible at face value, but could operate to disadvantage commercially viable schemes that are strategically valuable but trapped behind network constraints, or higher-risk schemes which could unlock more promising and scalable new opportunities.

The government is therefore still pushing for investment in infrastructure, but increasingly does not want its costs appearing directly on consumer bills – evidenced as well by the scrapping of a planned levy on gas bills that was intended to fund hydrogen projects which will instead be publicly funded. That can make funding more progressive, depending on the taxes used, but it also subjects long-term energy projects to competition within departmental budgets and future spending reviews.

The additional £20.4 billion for the National Wealth Fund and British Business Bank is potentially the strongest long-term growth measure in the package.

The National Wealth Fund (a public finance institution created in October 2024 to mobilise private capital for clean energy and industrial transformation) is expected to receive £15.4 billion and the British Business Bank £5 billion over approximately five years. The government estimates that the additional capital could support around 100,000 jobs by 2035 across green energy, defence and artificial intelligence.

The British Industrial Competitiveness Scheme is also relevant. From April 2027, around 10,000 eligible manufacturers will receive electricity discounts of approximately 20–25%, principally through exemptions from the Renewables Obligation, Feed-in Tariffs and Capacity Market costs. A payment in 2027 will also reflect support that participating businesses would have received during 2026-27.  

This may help reduce carbon leakage and make industrial electrification more commercially attractive. High electricity costs can otherwise make retaining or expanding UK manufacturing difficult, particularly where international competitors face lower prices.

But affordability is not itself decarbonisation. There is no obvious direct requirement in the Budget announcement for businesses receiving support to invest in efficiency, switch from fossil fuels or adopt transition plans. A stronger model from a sustainability perspective would combine competitive electricity prices with clear incentives for emissions reduction, electrification and low-carbon capital investment; potentially building on the Climate Change Agreement framework.

Within the additional £15.4 billion National Wealth Fund capitalisation, £2 billion has been earmarked for a new Energy Wealth Fund. The Fund is intended to invest North Sea revenues in clean-energy projects and infrastructure. The idea of recycling North Sea tax revenues into renewable and low-carbon infrastructure has a clear (if contentious) economic logic. The fund is intended to finance the transition away from the same revenue base on which its future contributions depend. Clear governance, an investment mandate and an approach to maintaining capital as North Sea receipts decline will therefore be important.

The Budget extends the 5p-per-litre fuel-duty cut and the wider freeze in fuel-duty rates to 1 July 2027. The HGV road-tax holiday is also maintained, while the 3.7p-per-litre reduction in red-diesel duty is extended to the same date.

The immediate cost-of-living and business arguments behind this change are clear, but extending fossil-fuel relief reduces the impetus to switch to lower-carbon vehicles and machinery.

The contrast with EV taxation is particularly awkward. The 2025 Budget introduced a mileage-based Electric Vehicle Excise Duty from April 2028. While there is a legitimate long-term case for EV users to contribute towards road funding as fuel-duty revenues fall, adding protection for petrol and diesel users while introducing a new mileage charge for EVs risks narrowing the financial advantage of switching. Moreover, as above, it seems that VAT will be charged when using public chargers.

The Budget does not place a comparably prominent EV, charging or public-transport package alongside the fuel-duty extension (although it does announce a taskforce to explore allowing drivers to use their domestic price plans at public chargers). The transport story therefore remains driven more by immediate affordability than by a coherent transition pathway.

There is no major new Budget-specific programme for nature recovery, Biodiversity Net Gain, flooding or adaptation. Instead, the environmental narrative is dominated by energy prices and industrial investment.

The new British Data Centre Covenant is a notable, if narrow, exception. Participating data-centre operators will be offered faster grid connections—and, where required, permission for onsite generation—in return for commitments concerning local investment, employment and protection of water supplies. The 'social licence' to develop and operate these increasingly controversial, and in-demand, assets is clearly going up the agenda.

The absence of specific new funding for nature and biodiversity is an ongoing issue and one we noted in last year's Budget Sustainability Stocktake. It highlights the ongoing tension between environmental safeguards and the government’s housing and infrastructure ambitions. While the government has developed a clearer explanation of how clean energy contributes to growth, it appears it is not yet able to articulate an equivalent economic case for nature, water security and physical climate resilience.

The Budget creates opportunities, but also a more complex policy environment for businesses to navigate.

1) Energy procurement strategies may need to change

Businesses should monitor the proposed fixed-price arrangements for existing renewables, the Cost Control Framework and wider electricity-market reforms. These measures could affect wholesale-price exposure, the availability and pricing of power purchase agreements, and the economics of onsite generation.

2) Grid position is becoming a strategic asset

Faster connections will benefit some projects, but prioritisation is likely to become more rigorous. Businesses developing clean-energy, storage, data-centre or industrial projects should assess not only whether they have a connection agreement, but whether they can demonstrate readiness, strategic value and deliverability. This is becoming an increasingly volatile and investment-critical issue, particularly in the context of ongoing Ofgem consultations on reforms to the demand queue.

3) Public capital may create new routes to investment

The expanded National Wealth Fund, British Business Bank and Energy Wealth Fund could provide debt, equity, guarantees or cornerstone capital for projects that struggle to secure purely commercial finance.

Businesses should assess eligibility early and be prepared to demonstrate additionality, regional benefits, credible delivery plans and measurable transition outcomes.

4) Transition plans should be tested against policy inconsistency

Businesses should not assume that every part of the policy framework will move in the same direction at the same time. Electricity taxation may favour electrification while fuel-duty policy protects fossil-fuel use. Public capital may encourage clean investment while planning and grid constraints delay delivery.

Robust transition plans will need to account for those tensions rather than relying on a single policy trajectory.

While not a "green" Budget per se, it does show a government attempting to make longer term climate-related sustainability measures more compatible with shorter term economic concerns. Clean power is presented as a response to high bills; electrification as an industrial-competitiveness strategy; and public investment as a means of mobilising private capital and creating regional jobs. The strength in this approach is that it connects sustainability to issues people and businesses experience directly. However, there are inevitable tensions between the two positions and gaps in the Budget's plans which will need to be bridged before these two previously competing agendas can be delivered in one package.