Siemens to Build Geothermal Power Station in Germany

Germany isn’t the first place that comes to mind when considering new geothermal power development, but that’s exactly what’s planned through a new arrangement between industrial giant Siemens and a community near Munich, Germany.

The Siemens Industrial Solutions and Services Group (I&S) has received an order from Geothermie Unterhaching GmbH und Co. KG to build a turnkey geothermal power station in Unterhaching near Munich. The geothermal power station, designed to generate 3.36 MW of power, will include the turbo-set, a heat-exchanger circuit, the cooling system, the electrical power equipment including power input and the instrumentation and control system. “We urgently need more power and heat from low-temperature springs. We are therefore now building the most modern plant of its kind in Unterhaching,” said Mayor Dr. Erwin Knapek. In the area of Unterhaching near Munich, situated in the south-German Molasse basin, the porous limestone contains hot water with a temperature of more than 100 degrees C at a depth of around 3000 meters. In order to exploit this source of hot thermal-spring water, the community, which has 21,000 inhabitants, established Geothermie Unterhaching GmbH und Co. KG and remains the sole owner. The station will work according to the Kalina principle, which enables heat from low-temperature springs to be converted into electrical energy with a higher degree of efficiency compared to conventional installations. Siemens is responsible for constructing the administration building and the machine building including noise protection measures and will provide maintenance for the power station for the first ten years of operation. The total value of the contract is around USD $18,890,000 and commercial operation scheduled for mid-2007. A drilling operation carried out in summer 2004 encountered water with a temperature of 122 degrees C at a depth of 3300 meters. The well will produce a supply of hot water at a rate of 150 liters per second. Of this amount, 25 liters per second will be used to generate heat for the district heating system whereas the remaining 125 liters per second will be used to generate 3.36 MW of electrical energy in the new geothermal power station. Siemens was awarded the contract for this geothermal power station because the competence of the company was the best way of ensuring that the local citizens will benefit from a sustainable supply of electricity and heat.
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