Which Energy Powers Are Devolved and Which Are Reserved

Energy policy in the UK is split down the middle, and the split runs through the middle of a household's bill. The generation, transmission, distribution and supply of electricity, oil and gas are reserved to the UK Government, together with consumer protection, product standards, weights and measures, as the Welsh Government itself set out in its fuel poverty consultation¹. That means who sells you energy, at what capped rate, under what licence and with what consumer protections, is decided at Westminster for Great Britain as one market.

What is devolved is everything that touches the building you live in and the support you can claim. Housing, building standards, planning and fuel poverty are devolved policy areas, and fuel poverty in particular is defined and measured differently in different parts of the UK². So the Scottish Government, the Welsh Government and the Northern Ireland Executive each run their own efficiency schemes, advice services and targets, while the price on your meter is set by a GB-wide regulator. Northern Ireland sits outside even that, with its own market, department and regulator.

Reserved matters: generation, supply, networks and consumer protection

The reserved side of energy covers the whole chain from power station to plug. The Welsh Government's consultation on tackling fuel poverty states it plainly: "Energy, including generation, transmission, distribution and supply of electricity, oil and gas are matters reserved to the UK Government, together with consumer protection, product standards, weights and measures."¹ Wales has repeated the point in its own energy efficiency strategy, noting that "Laws about energy efficiency are made by the UK Government but we want to do everything we can so Wales is using and managing its energy well."⁶

Scotland's Heat in Buildings Strategy, the document that sets the direction for how Scottish homes will stop burning gas, makes the same admission about the levers it lacks: "Consumer protection is controlled by the UK Government."⁷ The strategy can set targets for how buildings are heated, but the rules governing the companies selling the energy are not Scottish Government rules.

Consumer representation follows the same GB-wide pattern. Citizens Advice "has statutory responsibilities to represent the interests of energy consumers across Great Britain"⁸, one body covering England, Scotland and Wales. Where the four governments do share an energy lever, it is by agreement rather than devolution: the UK Emissions Trading Scheme is "jointly administered by the Scottish Government, UK Government, Welsh Government and Northern Ireland Executive"⁹, a single carbon market run collectively.

Westminster legislation also carries the system-wide duties. The Energy Bill was centred on three pillars: "Leveraging investment in clean technologies. Reforming the UK's energy system and protecting consumers. Maintaining the safety, security and resilience of the energy systems across the UK."¹⁰ All three are reserved responsibilities, and all three shape what any household can do, because they govern the market the household buys from.

Levies sit on the reserved side too, and they reach straight into bills. The Energy Company Obligation, "first introduced in 2013, is a government energy efficiency scheme for Great Britain"¹¹, funded through obligations on suppliers and recovered from bills. A GB-wide scheme delivering home insulation is therefore administered through a reserved lever, even though the homes it treats are the devolved governments' responsibility.

The price cap: a Great Britain instrument that caps rates, not bills

The energy price cap is the clearest example of a reserved energy power acting directly on a household. Ofgem sets the cap level every 3 months³, and it "protects people who are on tariffs where the unit rate can go up or down depending on the energy market", the standard variable tariffs that customers end up on when they have not signed a fixed-term contract⁵. It came into force at the beginning of 2019 and was introduced across all payment types in January 2019¹².

What the cap actually limits matters, because many households misunderstand it. It sets "maximum prices for a unit of energy and daily standing charges for customers in each energy supply region of Great Britain", with separate caps for gas and electricity, and "the cap does not limit annual bills, which depend on how much energy a household uses"⁵. Ofgem's own wording is blunt: "It does not limit the cost of your total bill. The more energy you use, the higher your bill will be."³

The numbers move quarterly. For 1 January to 31 March 2026 the cap made a bill "for a dual-fuel home with typical usage in Great Britain who pay by direct debit" around £1,758 a year, with electricity at 27.69p per kWh and a 54.75p daily standing charge⁴. Ofgem confirmed that the cap for 1 April to June 2026 would fall by 7%⁴. The typical consumption behind these figures is assumed to be 2,500 kWh for electricity and 9,500 kWh for gas¹².

The table's figures come from Ofgem's cap summary for 1 October to 31 December 2025¹³. Payment method is one of several factors that make the cap vary, alongside where you live, fuel type and meter type³. A separate cap is set for each of 14 regions and applies throughout the region, with no breakdown below regional level⁵, and a levelisation allowance exists for "making sure prepayment and Direct Debit customers pay the same standing charge"³.

The cap's build-up shows how many reserved levers sit inside one bill: wholesale costs, network costs, policy costs, operating costs, EBIT, headroom, the levelisation allowance and VAT at 5% on gas³. Network costs alone make up around one quarter of the total⁵. Policy costs were cut in April 2026, when the government ended a levy-funded energy efficiency scheme and shifted the largest renewable generation support scheme to general taxation⁵. The cap's history also shows its limits as protection: rapid increases in wholesale prices from mid-2021 led to a 54% increase in the cap in April 2022, and the Q4 (October to December) 2022 price cap was £3,371¹². Ofgem states it "will be closely monitoring supplier compliance and will continue to take firm action against suppliers who fall short of their requirements"¹³.

Two boundaries are worth marking. The cap does not cover fixed tariffs, business energy contracts, heat networks or heating oil³, so households off the gas grid in effect fall outside its main protection. And it is a Great Britain instrument: it applies to "customers in each energy supply region of Great Britain"⁵, which excludes Northern Ireland entirely.

Devolved powers: housing, building standards, planning and fuel poverty

The devolved side is the fabric of the home and the support around it. Legislation on the energy performance of buildings is devolved in Scotland and Northern Ireland, while competition law and consumer protection law are reserved to the UK Government, a split the Scottish Government set out in its EPC reform response¹⁴. That is why an EPC in Glasgow or Belfast is not the same document as one in London, and why each nation can set its own standards for how homes must perform.

Fuel poverty is the other big devolved lever. It is "a devolved policy area and is defined and measured differently in different parts of the UK"², so a household can be counted as fuel poor in one nation and not in another on the same income and bill. All three devolved administrations have run their own additional, government-funded fuel poverty reduction programmes, focusing on energy efficiency¹⁵, which is why the grant landscape differs so sharply between why energy grants differ by nation.

Wales illustrates how the devolved levers are used despite the reserved core. The Committee on Climate Change noted, in relation to Wales' Fourth Carbon Budget, that "These sectors have significant policy powers devolved to the Welsh Government."¹⁶ Scotland, meanwhile, has used devolved powers on generation policy to different effect: its renewable share of electricity generation stood against "just 29.3% for the UK as a whole (or 25.6% for the rest of the UK, excluding Scotland)" in the figures reported in its 2019 Annual Energy Statement¹⁷.

Planning, which decides whether a household can put up a wind turbine or a solar array, is devolved and divergent. Official guidance on wind turbines states: "Guidance here relates to the planning regime for England, the policy in Wales may differ."¹⁸ The same equipment can face different rules in each nation, which is why this site carries separate pages on planning rules for home energy equipment in Scotland, Wales and Northern Ireland.

Advice services are devolved too, and the difference is visible to households. A Commons committee report recommended that "the Government's present basic energy advice service available in England is upgraded to a specialist bespoke advice service similar to the Home Energy Scotland network"¹⁹, a recognition that Scotland's devolved advice service had become a model England had not matched. Scotland has also used its devolved voice on reserved matters, urging "the UK Government to rebalance environmental and social obligation costs (levies) on energy bills to reduce the premium paid by customers using electric heating"²⁰.

Northern Ireland runs its own arrangement, not a variant

Northern Ireland is not a fourth region of a GB energy market. It is a separate market with its own department and its own regulator, and the GB instruments described above stop at the Irish Sea. The Energy Bills Support Scheme payments were made by electricity suppliers "in England, Wales and Scotland"²¹, a list that excludes Northern Ireland, which received support through its own arrangements. The Energy Company Obligation is a scheme "for Great Britain"¹¹, and the price cap covers "each energy supply region of Great Britain"⁵.

Its legislation runs on separate tracks as well. Northern Ireland's energy performance rules are devolved alongside Scotland's¹⁴, and its own statutory instruments carry the machinery of its energy administration. Under the 2012 Order, where a dispute is referred, "the Department who shall appoint a suitably qualified person to determine the dispute", and that appointed person may "order as they think fit whether the costs (or any part of them) associated with the determination should be borne" by one or other party²². The Department here is a Northern Ireland department, acting under Northern Ireland law.

The statistics machinery reflects the separation too. Official energy publications have long carried separate electricity generation and supply figures for Scotland, Wales, Northern Ireland and England²³, because the systems are measured apart. Fuel poverty in Northern Ireland is defined and measured on its own terms, as it is in Scotland and Wales², and the Executive runs its own programmes, such as the Affordable Warmth Scheme and the Northern Ireland Sustainable Energy Programme.

For a household, the practical consequence is that almost nothing said about GB energy arrangements can be assumed to apply in Northern Ireland. The regulator is different, the cap does not exist there, the supplier obligations differ, and the support schemes are separately designed and funded. Our pillar page on home energy across the UK nations sets out the full picture.

Where the powers are written down

The reserved powers are anchored in Westminster legislation and instruments. The Energy Act 2004 gives the Secretary of State sweeping financial powers over scheme administrators: the Secretary of State "may give financial assistance to the scheme administrator", "make payments to the scheme administrator (otherwise than as financial assistance) in pursuance of arrangements under section 212(1)", "guarantee the discharge of any financial obligation incurred by the scheme administrator in connection with arrangements under section 212(1)", and "make regulations conferring or imposing" specified powers or duties on scheme administrators²⁴. These are the statutory foundations for UK Government funding and direction of energy schemes.

Planning call-in powers show the reserved hand reaching into a devolved area. Under the 2015 regulations, a direction may not have effect "within a period of 28 days beginning with the date on which the direction is made", and where the Secretary of State is considering exercising the call-in power, "the Secretary of State must give notice in writing ('the pause notice') to the relevant local planning authority"²⁵. The Secretary of State can therefore intervene in local planning decisions, a reserved power sitting on top of a devolved system.

Northern Ireland's own statute book carries its energy administration, as the 2012 Order on dispute determination shows²². The overall shape is consistent: reserved matters are written in UK-wide legislation, devolved matters in the legislation of each nation, and the boundary between them is what produces the patchwork a household actually experiences.

Friction points along the divide

The split creates real tension, because the devolved governments are accountable for outcomes they cannot fully control. Scotland's fuel poverty strategy is explicit about the constraint: it urges "the UK Government to rebalance environmental and social obligation costs (levies) on energy bills to reduce the premium paid by customers using electric heating"²⁰. The Committee on Climate Change has made the same point in its advice on Scotland's carbon budgets, that "Making electricity cheaper, through rebalancing prices to remove policy levies from electricity bills, is a key recommendation"²⁶. A devolved government wanting households off gas and onto heat pumps is asking them to switch onto a fuel that carries levies set in Westminster.

Levies flow in the other direction as well. Welsh Government policy notes "UK Government policy to support Energy Intensive Industries (EEI) with their energy costs by applying an EEI levy to the bills of other consumers"²⁷, a reserved decision that lands on every household bill in Wales. The Welsh Government has also responded formally to Ofgem's call for evidence on standing charges, another sign of a devolved administration engaging with reserved levers it cannot pull²⁷.

Advice provision is a quieter friction. England's basic energy advice service was judged by a Commons committee to need upgrading "to a specialist bespoke advice service similar to the Home Energy Scotland network"¹⁹, meaning the quality of help a household gets depends on which nation it lives in, for a problem, cold homes, that exists everywhere.

How the divide affects a home's self sufficiency

The division of powers maps directly onto a household's dependence. The UK is "a net energy importer with a high dependence on gas and oil"²⁸, and it "has been strongly affected by the energy crisis due to its dependence on natural gas for heating, electricity generation and industry"²⁹. Those are reserved facts: the import dependence, the wholesale prices and the cap that passes them through are all decided at UK level, and no devolved scheme changes them.

What devolution offers is the ability to attack demand. The UK Government's Heat and Buildings Strategy was assessed on the expectation that delivering its goals would "help to protect UK consumers from future price spikes and increase energy security by reducing energy needs and shifting demand from gas to electricity, which in future will be predominantly supplied from UK-based renewable generation"³⁰. The devolved governments hold most of the levers that reduce a home's energy need: insulation standards, efficiency grants, fuel poverty programmes and advice services¹⁵.

The pattern has a long history. As long ago as 2009, the plan was that "every household in Britain will receive expert, targeted help to reduce their fuel bills and access low-carbon heat and power"³¹, and the devolved fuel poverty programmes that followed have been the delivery vehicle for much of that help¹⁵. The Committee on Climate Change has since argued that "UK policy should place more focus on providing access to low-carbon technologies for low-income households"²⁹, a recommendation that would need both sides of the divide to act.

For a household asking what this means practically: the price you pay, the company you pay it to and the protection you get while paying are largely settled for Great Britain as a whole, and cannot be voted on in Edinburgh, Cardiff or Belfast. The fabric of your home, the grants you can claim, the planning rules on your roof and the definition of whether you count as fuel poor are settled nationally. Energy independence for a home therefore has two halves: cutting how much energy you need, which the devolved system can help with, and the price of the energy you still need, which is reserved. Our page on devolution and energy independence develops this in full.