Turleenan Substation is a 400kV substation located in Turleenan, Tyrone, UK.

The Turleenan Substation project’s construction is expected to begin in 2022. The works are expected to be commissioned in 2023.


Turleenan Substation project, which is a new substation, will be operated by System Operator For Northern Ireland.

The designed voltage level of the substation is 400/275kV and the operating voltage level is 400/275kV.

The step-in voltage of the project is 400kV and the step-out voltage is 275kV. Upon completion, the substation will have a capacity of 500MVA.

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Turleenan Substation project development status

The project is expected to be commissioned in 2023.

About System Operator For Northern Ireland

System Operator For Northern Ireland Ltd (SONI), a subsidiary of EirGrid Plc, is an electric transmission grid operator that develops the grid infrastructure. The company distributes electricity for the island of Ireland. It also provides services such as generators, ancillary services, renewables, smartgrids, grid codes, and tie-lines. SONI invests, develops, and improves grid to connect more renewable energy. The company’s operated grid is a meshed network of high voltage lines, substations, and cables that enable power to be transported in bulk from generators to areas of demand. SONI is headquartered in Belfast, Antrim, the UK.


All publicly-announced T&D Line & Substation projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects is sourced through secondary information sources such as country specific utility players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.