North Sea Wind Auction Closes Below Reserve As Operators Pull Back

The UK's latest offshore wind capacity auction has closed below its reserve volume for the first time, after several major operators pulled bids in the final week and the remaining participants priced more conservatively than the government had anticipated.

Allocation Round 7 cleared at 2.3 gigawatts of new capacity — short of the 3 GW the Department for Energy Security and Net Zero had publicly targeted, and well below the 4.6 GW notionally available. Strike prices settled at £77 per megawatt-hour for the main offshore tranche, a 12% real-terms increase over AR6 and a clear signal that supply-chain costs continue to bite.

Three issues are converging. Turbine costs have remained sticky despite easing material inputs, with major manufacturers including Vestas and Siemens Gamesa still working through warranty provisions on previous-generation platforms. Insurance premiums for marine construction have risen sharply after a string of cable failures. And the cost of capital — even for projects with full government offtake — is materially higher than it was during the bullish auctions of 2022.

Developers are also growing more selective about geography. RWE quietly withdrew its bid for two Scottish sites, citing grid-connection uncertainty; Ørsted has paused early-stage development on a North Sea project that did not clear AR7. The pattern reflects a recalibration that is now visible across European wind: capacity will still be built, but on a slower curve than 2030 targets imply.

For the UK, the political response is likely to be a strike-price recalibration ahead of AR8 in the autumn — and pressure on regulators to accelerate grid-connection decisions. Whether that's enough to draw the missing capacity back into the next round will depend partly on supply-chain inflation continuing to ease and partly on whether the offshore-wind sector's risk premium can be coaxed lower again.