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5 GW by 2030, 25 MW on the water — Ireland’s offshore wind delivery gap.
Ireland has auctioned billions in offshore wind and built almost none of it. Seabed rights have been granted, an auction won, a Celtic Sea plan published. On paper, the pipeline is thick. In the sea, there is one 25 MW demonstrator from 2004 — and nothing yet in construction.
Six observations stand out: the 2030 target is already gone on the arithmetic; one in four of the first auction’s megawatts is already dead (Sceirde Rocks, €35.4m bond forfeited); planning is the binding constraint (no Phase 1 decision by mid-2026); Ireland has no port to build offshore wind — Belfast took the work; prices are rising and dates are slipping (+15% in two years, a 2037 longstop); and the near-term renewable story is onshore — and it too is stalling.
The consequence: Irish offshore wind is a patient-capital, 2030s proposition, and the near-term value in Irish renewables is onshore — where the constraints are also real but the build times are shorter. The 80% target, on this timetable, is a 2030s achievement dressed as a 2030 one.
Ireland’s offshore story is a case study in the difference between a policy and a project. Every element of the policy is in place or arriving — a target, an auction, a regulator, a spatial plan, a plan-led grid. What is missing is the thing that turns policy into power: consented, financed, buildable projects, assembled at a port, connected to a grid, on a realistic timetable. The first cohort has tested every one of those steps and found them slow or absent.
Renewables are the generation-side of an integrated picture: the offshore grid will be built by EirGrid, whose network delivery is the subject of IE001; the demand the fleet must serve is dominated by the data centres of IE002; and the storage that firms a wind-heavy system is the subject of IE004. A renewable target missed by 2030 may be a consenting problem, a port problem, or a grid problem — telling them apart is the analytical task.
The shape of this volume. § 1 sets out the headline figures. § 2 develops twelve findings, each confidence-annotated. A chapter-weight pull at p. 14 anchors the argument. § 3 decodes the delivery machinery — planning, ports and the seabed regime. § 4 sets out the pipeline, the projects and the auctions. § 5 decodes onshore wind, solar and the 80%-by-2030 test. § 6 sets out recommendations, with a one-page tear-out at p. 25.
The legal target is 5 GW of offshore wind by 2030. ORESS 1 (May 2023) awarded 3,074 MW, of which Sceirde Rocks’ 450 MW has since withdrawn; ORESS 2.1 added Tonn Nua’s 900 MW with a 2037 longstop. What is actually generating is the 25 MW Arklow Bank demonstrator, built in 2004.
The dashed frame is the 2030 target; the awarded pipeline (moss) carries Sceirde’s withdrawn 450 MW hatched at the top of the bar; the ink bar is what generates. The sea is at 0.5% of the target.
HIGH — anchored to a named Irish primary source (DECC, MARA, An Coimisiún Pleanála, SEAI, Wind Energy Ireland). MEDIUM — direction of travel confirmed but a material figure is unpublished or contested. Every forward position is labelled as a projection.
Findings 01 – 12 · summary
Findings 01 – 09 follow in detail · pp. 11 – 13 · 10 – 12 carried on the § 6 matrix
Ireland’s legal target is 5 GW of offshore wind by 2030. The only operating offshore farm is the 25 MW Arklow Bank Phase 1, built in 2004 and now near the end of its life. With no commercial farm yet in construction, and offshore build times of several years from financial close, 5 GW by 2030 is no longer physically reachable. This is not a pessimistic reading; it is arithmetic. The value of stating it plainly is that every downstream decision — grid, ports, supply contracts, the RESS onshore auctions that must fill the gap — should be taken against the real horizon, which is meaningful offshore output in the 2030s, not 2030. A plan that continues to be sized and sequenced to a target everyone privately knows is gone will keep making the same timing errors. The first honest act of a credible offshore programme is to move the date.
Sceirde Rocks (450 MW, Corio Generation), a winner of the 2023 auction, formally withdrew its consent application on 17 December 2025 after site conditions — seabed geology and wave heights — proved unworkable, forfeiting a €35.4 million bond and writing off roughly €50 million spent (Irish Times / renews.biz). A quarter of the first offshore auction’s awarded capacity is gone before a single turbine went in. The lesson is not that Corio failed; it is that Ireland’s transitional, developer-led Phase 1 allocated seabed to sites chosen by developers before the State’s spatial planning was in place, and at least one of those sites turned out to be undeliverable. That is exactly the risk the plan-led regime that follows is meant to remove. For the survivors, Sceirde’s exit is a warning that a winning auction bid is not the same as a buildable project, and for investors it is a reminder that Irish offshore risk is front-loaded into consent and site conditions, not just construction.
Five Phase 1 projects lodged planning applications from 2024 — Codling, Dublin Array, North Irish Sea Array, Oriel and Arklow Bank 2. In April 2025, An Coimisiún Pleanála (the national planning authority) required the four Irish Sea projects to redo their cumulative-effects assessments, covering the combined impact of all of them together — resetting the clock. As of mid-2026 no decision had issued on any of them; the first are expected only at the end of 2026, with Oriel’s due in early December 2026 (Irish Times). The consenting system is now the binding constraint on the whole programme. This is a common pattern in early offshore markets — the first cohort tests a planning system that has never handled projects of this scale or number — but it is costly, because every month of delay pushes financial close, grid connection and first power further out, and compounds with the port and grid gaps below. For a developer, the practical exposure is that the single largest uncertainty in an Irish offshore project is now the date of a planning decision, not the wind or the turbines.