Solar thermal power plants play a key role in the Desertec project. Using solar collectors, water is transformed into steam which drives a turbine. Siemens is the market leader in steam turbines for solar thermal power plants. To date, it has already received almost 50 orders for especially adapted steam turbines with outputs ranging from 1.5 MW to 123 MW – including a 19-MW industrial steam turbine for the Solar Tres power tower facility in Spain.