SSE has secured contracts to provide flexible and renewable generation including onshore wind power in Ireland’s T-4 2029/30 capacity auction. The generation capacity will play a critical role in supporting security of supply.
In total, SSE was awarded contracts for 552.5MW of de-rated electricity generation capacity*, with 532MW of single and multi-year contracts awarded to SSE Thermal for flexible power generation
SSE Renewables secured a one-year agreement for 20MW of de-rated onshore wind capacity beginning October 2029 at a clearing price of €135,500/MW.
These provisional results are subject to approval by the Regulatory Authorities and are expected to be confirmed in May 2026.
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.