Two years ago [in 2009], Enertrag began to turn that concept into reality. Its executives laid the cornerstone for the world's first -- if small -- 21 million euro ($30.2 million) hybrid power plant that ties together all the elements of sustainable utility-scale energy production for industry and for mobility: cars, trucks, and buses, ships, and even airplanes in a ceremony presided over by a smiling German Chancellor Angela Merkel.
The concept is also designed to ensure electric base load availability, to guarantee forecast stability and to provide power for peak load needs. The plant, located some 70 miles northeast of Berlin in Prenzlau consists of three grid-connected 2 MW wind turbines; a 1 MW installed capacity biogas plant; a 500 kW (120 cubic meter/hour) electrolyzer to make the hydrogen; two 60 cubic meter/hour compressors that squeeze the hydrogen to 30bar (435 psi) for storage in five storage tanks with a combined capacity of 1,350 kg of hydrogen; and two combined heat-and-power plants of 350 kWelectric and 340 kWthermal that can operate on variable gas mixtures -- from a minimum of 30 percent biogas and 70 percent hydrogen up to 100 percent biogas.