Extresol Solar Power Station

Torre de Miguel Sesmero, Spain

The Extresol Solar Power Station is a 150-megawatt (MW) commercial concentrated solar thermal power plant, located in Torre de Miguel Sesmero in the province of Badajoz, Extremadura, Spain. The power plant is consists of three 50MW units built in three phases. The plant has a generating capacity of 175GWh per year. The power station consists of three different systems, Extresol 1, Extresol 2 and Extresol 3, of 50-megawatt (MW) each, due to the power limitation of 50 MW per plant. Extresol uses parabolic trough and has a thermal energy storage system, which absorbs part of the heat produced in the solar field during the day and stores it in molten salts. The Extresol solar power facility uses parabolic trough technology. The plant is spread across an area of approximately 500,000m². It uses molten salts for storing solar heat. Each unit of Extresol stores heats for 7.5 hours.

The solar field will have the following specs:

  • Solar-Field Aperture Area: 510,120 square meters
  • Number of Solar Collector Assemblies (SCAs): 624
  • Number of Loops: 156
  • Number of SCAs per Loop: 4
  • SCA Aperture Area: 817 square meters
  • SCA Length: 144 m
  • Number of Modules per SCA: 12
  • Mirror Manufacturer (Model): Flabeg (RP3)
  • Number of Heat Collector Elements (HCEs): 22,464
  • HCE Type (Length): Evacuated (4 m)
  • Heat-Transfer Fluid Type: Diphenyl/Biphenyl oxide
  • Solar-Field Inlet Temp: 293°C
  • Solar-Field Outlet Temp: 393°C
  • Solar-Field Temp Difference: 100°C

The power block will have the following specs:

  • Turbine Capacity (Gross): 50.0 MW for plant 1& 3 and 49,9 MW for plant 2
  • Output Type: Steam Rankine
  • Power Cycle Pressure: 100.0 bar
  • Cooling Method: Wet cooling
  • Cooling Method Description: Cooling towers
  • Turbine Efficiency: 38.1% at full load
  • Annual Solar-to-Electricity Efficiency (Gross): 16%
  • Fossil Backup Type: HTF heater
  • Backup Percentage: 12%


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