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Ismaning is developing its geothermal resources. Two wells have encountered thermal water at a depth of 2,000 metres.
© WVI Ismaning
Pump test continuing until spring

Ismaning banking on geothermal energy

The Bavarian municipality of Ismaning is generating increasingly more electricity and heat from local energy sources. During the next few days, pump and injection tests will begin on the new geothermal plant that will continue for several months. At a depth of around 2000 metres, the two wells are extracting more hot water than was originally assumed. The trial operation of the geothermal heat supply can therefore begin.

The Wärmeversorgung Ismaning (WVI) company can look back on 2012 with considerable satisfaction. WVI Managing Director Andreas Hobmeier explains: “We’re working on schedule and in budget. Above all, I’m delighted that the work has been conducted without any incidents.” The results of the two wells were already established in September and they are very impressive: the temperature of the extracted hot water is currently 75 °C and the extraction rate is at least 85 l/s. If these values are confirmed on a long-term basis, a thermal output of 7 to 8 MW is possible in Ismaning.

Just one and a half years after the Municipal Council made the decision to go ahead with the deep geothermal plant and after just 100 drilling days, the extended pump and injection tests are continuing until spring 2013. “With these tests we want to determine the final output data for the wells. Based on this data, we can then make an informed decision as to the size of the extraction pumps,” emphasises Hobmeier. The pumps are a key component for ensuring the long-term stability of geothermal plants and their commercial success. The test provides the basis for approving the future heat utilisation.

WVI is currently maintaining a gas boiler with an output of 5 MW as a back-up system. Next spring, the regular heating station with the heat exchanger for the extracted thermal water will be constructed next to the wells. Additional modular gas boilers to meet peak heating requirements and for securing the supply in Ismaning will then be housed in this building as required.

The heating networks in Ismaning are growing together

Additional 6-km-long district heating pipelines will be added next year. It is planned to expand the heating network in Ismaning to 50 km by 2020. The currently existing three district heating islands in individual residential areas will then grow together to form a comprehensive urban network. In future the district heating will then be able to supply 80 per cent of the households, whereby around 25 to 30 per cent of the heating requirements will originate from the deep geothermal plant.

Geothermal heating is being developed in Ismaning as part of a local energy concept. It is planned to increase the contribution made from the different forms of bio and solar energy, CHP and wind energy by 2030, whereby the municipality is pursuing the following energy policy goals:

  • Cost-effectiveness
  • Municipal supply
  • Generation of as much energy and added value locally as is possible
  • Stable prices for customers

The Ismaning project is being scientifically supported by the EnEff:Wärme and EnEff:Stadt funding initiatives organised by the German Federal Ministry of Economics and Technology and is being documented in detail on the online research portal of the same name.

More from BINE Information Service

Information on geothermal energy generation in the Bavarian Prealps and the plant in Unterhaching is provided in the BINE-Projektinfo brochure
Geothermal electricity generation combined with a heating network”(10/2009).
A comprehensive insight into deep geothermal energy in Germany is provided by the new BINE technical book “Geothermie – Energie aus dem Innern der Erde”. The book was published in the summer of 2012 and is available from bookshops (in German only).


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