FACTBOX-Spain nuclear plants' operating permits

July 2 (Reuters) - Spain said on Thursday its oldest nuclear power station could stay open for another four years in the Socialist government's first test of its electoral pledge to phase out nuclear energy.

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Following are details of when operating permits for Spain's nuclear power plants are due to expire, and when they are scheduled to complete the 40-year lifespan they were originally designed for.

Permits may be renewed for up to 10 years. PLANT CAPACITY PERMIT EXPIRES LIFESPAN EXPIRES* Jose Cabrera 150 MW April 30, 2006** Garona 466 MW July 5, 2009 Oct. 30, 2010 Almaraz I 980 MW June 8, 2010 March 10, 2020 Almaraz II 984 MW June 8, 2010 June 15, 2023 Asco I 1,033 MW Oct. 1, 2011 July 22, 2022 Asco II 1,027 MW Oct. 1, 2011 April 22, 2025 Cofrentes 1,096 MW March 23, 2011 July 23, 2024 Trillo 1,066 MW Nov. 15, 2014 Dec. 4, 2027 Vandellos II 1,087 MW July 27, 2010 Dec. 4, 2027

* Measured from when the plant's first operating permit entered force. Plants began commercial operations at a later date.

** Jose Cabrera, which was Spain's first nuclear power plant, was closed when its last permit expired. It is currently being prepared for dismantling.

Source: Nuclear Safety Council (CSN). (Compiled by Martin Roberts; Editing by Keiron Henderson)