SSE provisionally secures agreements in Ireland’s latest T-4 capacity auction

SSE has secured agreements in Ireland’s latest capacity auction to provide flexible generation that will play a critical role in supporting security of supply.

In total, 3,682 MW of capacity agreements were awarded in Ireland’s T-4 auction for the 2029/30 delivery year. These provisional results are subject to approval by the Regulatory Authorities and are expected to be confirmed in May 2026.

SSE was awarded contracts for 553MW of de-rated electricity generation capacity*. This includes a five-year agreement for 342MW for SSE’s operational Great Island Power Station in Co. Wexford at a value of €142,620/MW. This will allow SSE to invest in the asset to ensure it can continue to provide flexible power generation in response to system need.

Additionally, the company secured a 10-year agreement for a further 13MW of de-rated capacity for Platin Power Station at a value of €150,000/MW. This project is currently under construction in Co. Meath and already holds a 10-year agreement for 140MW at a value of €177,000/MW. Platin Power Station will be capable of running on both natural gas and sustainable biofuel (hydrotreated vegetable oil), with the potential to convert to run on low-carbon hydrogen in the future.

SSE also secured one-year agreements at a clearing price of €135,500/MW for its smaller peaking plants at Rhode in Co. Offaly (88MW) and Tawnaghmore in Co. Mayo (89MW), as well as 20MW of de-rated onshore wind capacity.

What is Ireland’s T-4 capacity auction?

The T-4 capacity auction is key to the design of the all-island wholesale electricity market. It helps deliver a reliable electricity supply, and is based on a competitive design where the most efficient and lowest cost capacity is most likely to be successful. The T-4 Auction aims to secure capacity from various technologies, including existing generation and new build capacity to ensure sufficient power for peak demand. The auction is known as a T-4 auction because it secures capacity four years in advance of construction.

*All volumes include a de-rating factor applied in accordance with the rules set by the System Operators and approved by the Regulatory Authorities.