The Arenales parabolic trough power plant near the city of Morón de la Frontera in Andalusia, Spain, parabolic mirrors concentrate solar radiation onto an absorber pipe, in which approximately 2,200 metric tons of Diphyl are circulating as a heat transfer fluid. With this heated medium and a heat exchanger, steam can be produced, which then as in a conventional power plant generates electricity using a steam turbine. A thermal salt storage facility means that electricity can still be generated after the sunset in summer months almost round the clock.

With an output of 50 MW, Arenales went on stream at the end of 2013 after a construction time of two years. It supplies around 50,000 Spanish households with environmentally friendly electricity. The building contractor was Ecolaire España, a subsidiary of the Spanish construction company OHL (Obrascón Huarte Lain) headquartered in Madrid.

Molten Salt Thermal Storage