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COMBINED GEOTHERMAL HEAT AND POWER PLANTS CHP

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COMBINED GEOTHERMAL HEAT AND POWER PLANTS CHP ( combined-geothermal-heat-and-power-plants-chp )

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EGEC – EUROPEAN GEOTHERMAL ENERGY COUNCIL MARKET POTENTIAL use of low-temperature resources : Neustadt-Glewe geothermal heating plant Economic figures of the Heat Plant The expenditures on the project including the purchase of the oil boiler unit in the residential area and the district heat supply system, as well as its extension or rehabilitation, amounted to € 9.45 million with € 6.44 million referring to the geothermal and heat production units. By the end of 1998, more than 1,300 households, 20 trade consumers and one industrial enterprise have been supplied with environment-friendly heat by the geothermal plant. Present activities are concentrated on the optimization of the individual sections of the plant, more rational primary energy use and extension of the supply network through the connection of more heat consumers. In Neustadt-Glewe, the emission of CO2 was reduced by about 2,700 tons in 1997. About 1.7 million m3 of natural gas were saved. Since beginning of operation, no incidents happened which could have been a risk to the environment. Economic figures of the Power Plant In Germany, electricity generation from geothermal heat has only since March 2000 been government-funded under the so-called Renewable Energies Act (EEG). Electricity from wind, sun, biomass and small hydro had already enjoyed this privilege since 1995. The change in legislation aroused the interest in the use of geothermal energy for power production. Bewag Aktiengesellschaft & Co. of Berlin developed ORC geothermal power plants with the following key features: • Wet cooling towers reducing own consumption to 18-20%. • Cogeneration because the sale of heat would increase revenues. Bewag then looked for a project to put the know-how to good account. The geothermal power plant in Neustadt- Glewe, a little town with 8000 inhabitants located 200 km northwest of Berlin, lent itself well for this purpose. The high share of geothermal heat in the overall heat volume supplied to the town of Neustadt- Glewe implied that space capacity was available for other uses (electricity generation) in the summer months and inter-seasonal periods. In addition, the smoothly operating Neustadt-Glewe geothermal plant was not subject to any geological risks, and also the operational risk inherent in the small innovative ORC plant was limited. Another crucial factor for the project was that this 200 kWe project could be implemented within the financial framework of the originally planned 125 kWe project with air cooling towers , i.e., of € 800,000 capital costs, out of which € 400,000 were grant-funded. The final costs of the project then amounted to € 950,000. 10

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