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The impact of Brexit on the energy sector depends on the wide range of possible outcomes from the post-Brexit negotiations, hinging on UK Government policy decisions and negotiation with the EU.
The UK's Brexit vote presents market and regulatory options which will be driven by a balance between achieving meaningful access to the UK and wider European energy markets and the desire to move away from EU legal and regulatory oversight in the UK.
Possible outcomes include:
A new relationship whereby the UK is substantively committed to the IEM is likely to mean continuing some level of indirect application of relevant EU Regulations and Directives and involvement in bodies of regulatory cooperation (eg ENTSO-E) cemented through the terms of a bilateral agreement with the EU (for example like the Treaty Establishing the Energy Community). A variety of significant issues will need to be addressed around access to EU energy markets and it will be a challenge to achieve in the short time frame before Brexit, although the issues could be resolved during the UK Government's proposed 'implementation phase' which would span the period from Brexit until the details of the long term deal had been bottomed out.
Despite its name, the UK government's “Great Repeal Bill”, will seek to ensure that most EU law currently applicable in the UK remains UK law after Brexit, with change after that being a gradual process. This should reduce uncertainty for business. However, this cannot completely replicate the present situation as, for example, UK legislation cannot bind the remaining EU Member States to recognise UK conformity under that legislation.
Irrespective of the UK Government's approach to Brexit, the fundamental need for “the lights to stay on” – affordably and with reduced emissions – remains. Investment will still need to be incentivised to replace or enhance ageing infrastructure across electricity generation, grid upgrades and the UKCS.
Energy market participants will also need to bear in mind changes to the application of other EU law arising from Brexit – State aid, EU merger control and environmental/HSE being areas of key importance to so many transactions in the sector as well as the potential impacts of other changes such as the ability of the UK construction industry to support the energy sector's needs if immigration controls (on EU or other citizens) restrict businesses' ability to secure the necessary human resource.
Owners of energy assets and prospective investors can assess the potential consequence of Brexit on the energy sector, by asking for example:
By assessing and quantifying these and asset-specific challenges, energy operators and investors can define and prioritise mitigation strategies. They may wish to lobby government and industry bodies with arguments to shape future policy and should monitor developments as the political landscape continues to shift and be prepared to modify their investment models and policies in response to evolving certainties.
An interesting dilemma for the UK Government, that both stands apart from, and is fundamentally intertwined with, its view of the post-Brexit landscape. Visibility on energy policy direction should be forthcoming over the coming months – hopefully including a healthy dose of pragmatism. The inherent complexity and existing interconnectivity of the sector suggests an interesting few years lie ahead.
The contents of this publication are for reference purposes only and may not be current as at the date of accessing this publication. They do not constitute legal advice and should not be relied upon as such. Specific legal advice about your specific circumstances should always be sought separately before taking any action based on this publication.
© Herbert Smith Freehills 2025
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