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November_December 2017 2017

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Power Plants

  • Directorio de Eficiencia energética

Power Plant Profile > Gemasolar

Gemasolar is the first commercial-scale plant in the world to apply central tower receiver and molten salt heat storage technology. The relevance of this plant lies in its technological uniqueness, since it opens up the way for new thermosolar electrical generation technology.

Characteristics of Gemasolar:

Rated electrical power: 19.9 MW
Net electrical production expected: 110 GWh/year
Solar field: 2,650 heliostats on 185 hectares
Heat storage system: the molten salt storage tank permits independent electrical generation for up to 15 hours without any solar feed.
The prolongation of the plant's operating time in the absence of solar radiation and the improvement in efficiency of the use of the heat from the sun makes Gemasolar's output much higher than that which is delivered by other technologies in a facility with the same power.

The notable increase in the plant's power efficiency guarantees electrical production for 6,500 hours a year, 1.5 to 3 times more than other renewable energies. The plant will thus supply clean, safe power to 25,000 homes and reduce atmospheric CO2 emissions by more than 30,000 tons a year.

The power generated by Gemasolar will be sent through a high-tension line to the substation of Villanueva del Rey (Andalusia, Spain), where it will be injected into the grid.

Central tower technology
The inclusion of a novel molten-salt heat storage system permits the production of electricity in the absence of solar radiation.

The heat collected by the salts (capable of reaching temperatures above 500º) generates steam and produces electrical power. The surplus heat accumulated during sun hours is stored in the molten-salt tank.

In this way, Gemasolar can produce electrical power 24 hours a day for many months of the year.

Details Overview:
Tower Height 140 m, Total reflective area 304.750 m2, Surface area of the solar field 185 Ha, Thermal storage capacity 15 h (equivalent hours of turbine operation),CO2 emission savings 30.000 t/year, started in october 2009 operative since july 2011


Fuentes de Andalucía (Seville, Spain), Andalucia (Spain) - view on map


Solar Thermal Power Plants


Torresol Energy


Torresol Energy

Installed Capacity

19,9 MW

Annual Output

110 GWh/year

Main Sub Contractors

Engineering SENER, Another technological milestone is SENER’s development of the molten salt receiver, a product manufactured by ITP, belonging to the SENER Group, in Spain. This is 100% Spanish technology, which reduces manufacturing, assembly and maintenance costs. A high-efficiency thermal design that withstands high peaks in solar radiation with guaranteed operation for 25 years.