Stellio Heliostat

Gallery Stellio Heliostat 1
Gallery Stellio Heliostat 1
July 2020
Headquarters 70197 Stuttgart, Germany

Stellio Heliostat - A large software-controlled mirror designed to reflect solar radiation onto a heat exchanger mounted on a tower top for power generation.

Stellio Heliostat delivers a solution to deploy high-efficiency solar power generation in sunny areas with large-scale, grid-connected facilities thanks to its combination of high optical quality at low costs.

Renewable energy sources must replace fossil fuels. Stellio believes that solar energy is the single most important renewable energy source but there are challenges to overcome such as electricity cost and generation intermittency. Both of these are tackled by Stellio Heliostat, providing low cost dispatchable solar electricity using solar-thermal power tower plants with large integrated thermal energy storage and Stellio Heliostat fields. Stellio's key technical data including an optimized reflective area of 48.5 m², high tracking accuracy (better than 0.6 mrad @ 4 m/s) and high optical quality (sigmaxy below 1.6 mrad). Overall, Stellio Heliostat appropriate size and precise optics at low manufacturing costs result in a significantly improved cost/performance ratio, and thus in lower electricity generation costs.

Key features

  • Reduction of over 90 % of CO2-emissions compared to coal-fired power plant
  • Up to 10 % higher field efficiency thanks to higher optical, tracking accuracy and superior field layout resulting in 10% reduced field area


  • Reduces CAPEX from 10% to 30 % compared to standard T-Type heliostats
  • Reduces OPEX by 30% thanks to a reduced area to be cleaned, low power consumption and easy maintenance

Categories of Application

Company Profile

Maturity Stage

  • Medium and large scale commercialization
  • Small scale commercialization
  • Initial market commercialization
  • Prototype testing in the real world
  • Prototype testing 1:1 in the lab

Looking For

Activity Region

  • /


Germany, Spain,

  • Headquarters
  • Activity

Related Topics

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