Spanish-Abu Dhabi joint-venture company Torresol Energy has begun commercial operation of two 50 MW solar thermal power plants at San Jose del Valle in Spain’s southern Cadiz province.

The twin installations required an investment of around Eur540 million ($695 million) and took two years to build.

Named Valle-1 and Valle-2, the power plants use parabolic trough technology to concentrate solar light and have underground molten salt storage chambers to store heat for generation during low sunlight periods.

Torresol Energy is 60% owned by Bilbao-based engineering-construction company Sener and 40% owned by Abu Dhabi energy investment company Masdar.

Last year, the joint venture started up the 20 MW Gemasolar solar thermal power plant at Fuentes de Andalucia in Spain’s southern Seville province.

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