Offshore Wind Rules 2026: What Changes for Marine Sites

A new set of UK regulations changes how ministers deal with offshore wind plans and projects that are judged harmful to protected marine sites. On legislation.gov.uk, the instrument is listed as coming into force on 21 May 2026, and Defra’s policy paper says the aim is to support offshore wind growth while still protecting the UK’s marine protected areas network. If the legal wording felt dense, the short version is this: government wants more flexibility over how nature damage is compensated when an offshore wind scheme is allowed to go ahead despite a negative site assessment. (legislation.gov.uk) The legal basis sits in the Energy Act 2023. The Act’s explanatory notes say section 293 gives the appropriate authority power to make regulations both about assessing environmental effects and about securing compensatory measures for the adverse effects of relevant offshore wind activity on protected sites. That matters because this is not a side issue or a bit of guidance; it is a formal rewrite of how part of the offshore wind consent system works. (legislation.gov.uk)

The main legal shift is from a narrower compensation duty to a new duty to secure “appropriate compensatory measures”. Defra says those measures must benefit the UK Marine Protected Area network in a way that is reasonably proportionate to the damage, or predicted damage, to a European site, European offshore marine site or Ramsar site. Defra also says the reform opens the door to “wider compensatory measures”, meaning action that helps the wider protected network rather than only the exact feature that has been harmed. (gov.uk) **What this means:** if you know the phrase "biodiversity offset", this sits in similar territory, but with tighter legal checks. In plain English, ministers are saying that the answer does not always have to focus only on the directly affected feature if a broader marine measure would give a better ecological result overall. That is the big trade-off here: more room to build offshore wind, but also more room for compensation to happen in a broader and less direct way. (gov.uk)

The safeguard built into the new system is the compensation hierarchy. In Defra’s proposed version, Tier 1 is action that benefits the impacted feature itself, Tier 2 is action that benefits a similar feature, and Tier 3 is action that benefits the wider UK Marine Protected Area network. The rules say you move down that ladder only if no higher-tier measure is available, or if there is evidence that a lower-tier option would deliver a greater ecological benefit. (gov.uk) So this is not supposed to be a free choice for developers. The hierarchy is designed to stop anyone jumping straight to the broadest, most convenient option. Defra’s paper says statutory nature conservation body advice is part of that judgement, and wider measures need ministerial approval before they can be used in Tier 2 or Tier 3. For students reading this, that is the key lesson: flexibility has been added, but it has been wrapped in a sequence of tests. (gov.uk)

The geography is slightly fiddly, so it is worth slowing down. Defra says the reform applies to relevant offshore wind activity in English inshore and offshore waters, Scottish offshore waters, Welsh offshore waters, and some Welsh and Northern Ireland inshore cases where the Secretary of State has the qualifying role. Defra also says the Welsh Ministers may publish their own guidance and hierarchy for some cases, while the Scottish Government is handling a separate Scottish instrument for its inshore waters. (gov.uk) That split is not a drafting accident. The Energy Act 2023 notes explain that the “appropriate authority” can be the Secretary of State or, depending on the location and function involved, ministers in Scotland, Wales or Northern Ireland. So although this is one reform story, it still runs through the UK’s shared and sometimes awkward system of environmental and energy decision-making. (legislation.gov.uk)

Another important point: these rules do not wipe away habitat assessments. They only matter in cases where there has been a negative assessment and the plan or project is still agreed or upheld. Defra also says more guidance will be published on how the hierarchy should work in practice, including mitigation first, marine irreplaceable habitats, additionality, timing, adaptive management and monitoring. In other words, compensation is still meant to come after avoidance and mitigation have been considered, not before. (gov.uk) There is also a built-in check on whether the system works. Defra says the statutory instrument, the guidance and the compensation hierarchy must be reviewed by 30 April 2031 and then at intervals of at least every five years after that. The same policy paper says adaptive management is staying in place, and monitoring remains a normal planning condition. That gives ministers room to claim this is not a permanent blank cheque, but a system that can be tested and revised. (gov.uk)

One practical route through the new system is the Marine Recovery Fund. On GOV.UK, Defra says offshore wind developers can apply to use the fund to deliver strategic environmental compensation for adverse effects on marine protected areas. In the offshore wind reforms paper, Defra says the fund was launched in December 2025 and will be one of the delivery routes for new compensatory measures under these reforms. It also says the simplest and quickest route for small impacts may often be to use the fund. (gov.uk) That is why this matters beyond legal drafting. A compensation duty on paper is one thing; a delivery route with money, eligibility rules and a pipeline of measures is another. The Marine Recovery Fund points towards a more strategic model in which some compensation may be organised at scale rather than negotiated from scratch for every single project. Whether that feels efficient or too distant from local damage will depend on how the fund is used in real cases. (gov.uk)

The political driver is speed. The Clean Power 2030 Action Plan says the UK is aiming for 43 to 50 GW of offshore wind by 2030, and Defra presents these reforms as part of the Offshore Wind Environmental Improvement Package that is meant to de-risk and accelerate planning decisions while protecting the marine environment. Put simply, ministers think the old approach was too slow and too hard to deliver at the scale needed for the clean power push. (gov.uk) But government’s own reviewers also flag the awkward questions. The Regulatory Policy Committee said Defra’s options assessment was fit for purpose, yet it also said more explanation was needed on how prices for new compensation measures will be set, how other marine users such as fishing may be affected, and how nearby communities could lose out if compensation happens in a different place from the damage. That is a useful reminder that faster consenting is not the only public interest at stake. (gov.uk)

So what does this law really do? In practice, it moves the system away from a focus on the impacted feature alone and towards a broader network-wide approach, as long as authorities follow the hierarchy and can show the result is reasonably proportionate. Supporters will argue that this is a more realistic way to build clean electricity in a crowded sea. Sceptics will ask a harder question: if the harm is local and specific, can broader compensation ever fully answer for that loss? The law now gives ministers more room to make that case. (gov.uk) **What it means:** if you are teaching this, studying it or just trying to read the politics clearly, do not stop at the statutory instrument’s title. Watch the guidance, the published hierarchy, the ministerial approvals for wider measures and the later review reports. Defra says guidance on using the hierarchy and the compensation duty will be published as the instrument comes into force, and those documents will show how strict or loose this new system becomes in practice. (gov.uk)