Norfolk Vanguard DCO update on HHW SAC measures

Let’s slow this news down and make it useful. On 18 December 2025 the Secretary of State approved the Norfolk Vanguard Offshore Wind Farm (Amendment) (No. 3) Order 2025 (S.I. 2025/1363). It came into force on 19 December 2025, according to legislation.gov.uk.

If you’re studying planning or marine policy, this sits within the Planning Act 2008 system. Norfolk Vanguard already had a Development Consent Order (DCO) from 2022. This new instrument records a non‑material change - a small legal adjustment that does not alter the project’s overall scope but clarifies how environmental duties are delivered.

The focus is the Haisborough, Hammond and Winterton Special Area of Conservation (HHW SAC), off the Norfolk coast. Cables for the wind farm cross this protected seabed, so the DCO contains compensation rules to help protect the national site network when cable installation and protection disturb habitats.

Two housekeeping updates land first. The Order now defines ‘Defra’ as the Department for Environment, Food and Rural Affairs, and it updates ‘undertaker’ to Norfolk Vanguard West Limited (Company No. 08141115), the company responsible for carrying out the consent.

The key plan driving seabed measures is the benthic implementation and monitoring plan - the BIMP. A small expert group, called the benthic steering group (BSG), helps shape and review the BIMP so the activities proposed and the evidence collected stay focused on the condition of the HHW SAC.

Monitoring is tightened. Results from the scheme must be sent at least annually to the Secretary of State, the Marine Management Organisation (MMO), and the relevant statutory nature conservation body. If findings show the measures aren’t working well enough, the company must propose fixes and then deliver whatever is approved.

One sentence is removed from the previous rules. The earlier text that said no cable installation works in the HHW SAC may start until a set area of marine debris has been cleared is deleted. The wider BIMP obligations remain, but the explicit ‘no works before debris clearance’ line no longer appears.

The completion milestone is clearer too. Once the BIMP activities are finished, a completion report must go to the Secretary of State within twelve months, unless another timetable is agreed.

An important safety valve is added. If the required area of marine debris cannot be removed, in whole or in part, the undertaker may apply to make a payment into the Marine Recovery Fund as an adaptive measure, in substitution for the shortfall in debris removal.

The Marine Recovery Fund is established under section 292 of the Energy Act 2023 to deliver strategic environmental compensation. Under this DCO, any payment must match the scale of the impact on the HHW SAC and be agreed with Defra or whichever body operates the fund.

When applying to switch to the fund route, the company must show both the share of impacts that overlap with the Norfolk Boreas project because they use a shared cable corridor, and how much material has already been removed under the BIMP. That helps the Secretary of State calibrate any payment.

The Secretary of State has to be satisfied on two things before approving the switch: that using the fund is acceptable in principle, including the exact proportion it can replace, and that Defra has confirmed the fund can be used and has put a monetary figure on the payment. Only then can approval be given.

Even with that approval, there is a pause. No cable installation within the HHW SAC can go ahead unless and until an implementation and monitoring plan is approved and the undertaker is released from further on‑site compensation duties under the terms set out in the Order.

That release can happen in three ways: when the completion report is approved; or after the full Marine Recovery Fund payment is made; or after a contract for instalments is signed and the first instalment is paid. If instalments are used, the company must keep paying as scheduled - discharge from duties does not cancel the payment plan.

Roles are clearly assigned. The Secretary of State makes the decisions and signs off plans; the MMO provides marine regulation expertise; the statutory nature conservation body provides ecological advice; and Defra oversees the operation of the Marine Recovery Fund or confirms who does.

If you’re learning how UK consents work, this is a neat case study in adaptive management. The DCO still expects practical seabed work through the BIMP. But it now also recognises that, if on‑the‑ground clearance cannot fully be achieved, a strategic compensation route via the fund can top up protection for the wider marine network.

Here’s a quick glossary you can keep handy: Development Consent Order (DCO) - the permission for nationally significant projects; non‑material change - a small legal tweak that does not change the project’s overall scope; Special Area of Conservation (SAC) - a legally protected habitat site; BIMP - the plan that sets out seabed measures and how they’re checked; BSG - the group that helps shape that plan; MMO - the public body that regulates marine development in England; Marine Recovery Fund - a government fund used to deliver environmental compensation at scale.

The Order was signed on 18 December 2025 by John Wheadon, Head of Energy Infrastructure Planning Delivery, on behalf of the Secretary of State for Energy Security and Net Zero. As of today, 3 January 2026, these changes are in force.