ESB and Ørsted JV Wins 900 MW Offshore Wind Project in Ireland
A joint venture company formed by ESB and Ørsted have won provisional rights to develop a 900 MW offshore wind farm at Ireland’s Tonn Nua site under a 20-year CfD awarded at EUR 98.719/MWh.
November 29, 2025. By Mrinmoy Dey
The two-way contract-for-difference (CfD) has been awarded at a strike price of EUR 98.719/MWh. The partially indexed CfD will run for 20 years from wind farm commissioning expected in the mid-2030s, the company said in a statement.
ORESS Tonn Nua is Ireland’s second support regime for offshore renewable energy development, and the first offshore wind auction under the new state-led planning regime.
The next step for the project is to seek a Maritime Area Consent and Marine Usage Licence from the Irish Maritime Area Regulatory Authority in order to commence surveying and assessment ahead of submitting a planning application for the development, it said.
Ireland’s transmission system operator (TSO) EirGrid will build the transmission assets (offshore and onshore substations and export cables). The Tonn Nua Offshore Wind Farm must be operational by the longstop date of January 1, 2037 under the CfD terms and conditions.
Alana Kühne, Head of Region Europe Development at Ørsted, said, “We commend the Irish government for running a successful auction continuing the support for the development of offshore wind in Ireland. Offshore wind will play an important part in the future Irish energy system ensuring green, affordable and secure energy. We will continue to work with our joint venture partner ESB to carefully assess and progress this early-stage development opportunity, including ensuring that the project lives up to our value creation criteria.”
Jim Dollard, Executive Director for Generation and Trading at ESB, commented, “ESB is delighted with the outcome of the ORESS Tonn Nua auction. It secures a clear pathway for the development of a significant project off the coast of County Waterford marking another important step toward Ireland’s renewable energy and Net Zero ambitions. We look forward to working with our partners to deliver a project that provides significant energy security and price certainty for Irish consumers.”
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