Frequently asked questions

The basis for the supply relationship between district heating customers and suppliers is the state ordinance on general conditions for the supply of district heating (AVBFernwärmeV).

It provides for price amendment clauses as a steady element of the district heating supply contract between customer and supplier. District heating prices are recalculated at regular intervals.

The prices are adjusted annually on 1 May. The current price list is displayed at City Hall and on the website of Erdwärme Grünwald GmbH.

Like the electricity price and the gas price, the district heating price is essentially made up of fixed components (capacity price and metering price) and a consumption-based component (energy price).

The amount of the capacity price is based on the installed heat output capacity, i.e. the connected load of the customer's district heating system in kilowatts – from the time the district heating transfer station is ready for operation. The performance price covers 10% fixed costs, 50% investment costs and 40% labor costs of Erdwärme Grünwald GmbH.

The metering price is charged for the operation and maintenance of the meters, for data determination, data preparation and data provision for billing. Depending on the arranged heat capacity, the metering price will be charged onto the customer starting with the operation of the heat transfer station. Included are an investment cost share of 50%, a wage cost share of 40% and 10% costs which are fixed.

The energy price is directly dependent on the consumption of a household. This heat consumption, which is measured by the district heating meter in kilowatt hours, is multiplied by the energy price and the result is charged onto the customer. The energy price includes 35% of the heat price index, 35% corresponds to the development of the electricity price, 15% corresponds to the development of the investment costs and 15% are fixed costs of Erdwärme Grünwald GmbH.

The connection costs include the excavation work on the customer's property, laying the pipeline from the street to the planned mounting position of the building's transfer station, backfilling and compacting the trench and the transfer station itself.

The Erdwärme Grünwald GmbH Service Center will be happy to answer any questions you may have. Please write to nfrdwrm-grnwldd or call +49 89 944663 120 and we will be happy to arrange a free, approx. 20-minute appointment to visit you on site.

Erdwärme Grünwald GmbH invoices per fiscal year. So always from 1 January to 31 December of a year.

The geothermal doublet consists of two boreholes. The production well is used to extract water, and the reinjection well is used to return the cooled water to the subsurface.

The South German Molasse Basin is an area in the foothills of the Alps in southern Germany. The geological layer in the Molasse Basin – the "Malmkarst" – slopes from north to south. This influences drilling depths and temperatures of the water bodies. In the Munich area, the conditions for hydro-geothermal energy are very good: deep below the earth's surface there is a huge supply of hot water that can be tapped relatively easily.

Primary energy defines energy which still occurs in its natural form or source. Energy sources for primary energy are, for example, coal, gas, petroleum, nuclear energy but also renewable energy sources such as wind, solar, hydraulic and geothermal energy.

Construction of the district heating network began in August 2010 and was completed in December 2017. Since then, the network has been upgraded in stubs to the main line and currently measures around 100 km of pipeline.

The production well has a depth of 3,755 meters and the reinjection well 3,428 meters. The distance between the two wells at depth is approximately 2,000 meters.

The heating plant was completed in November 2012 and has a total heat output of approximately 40 MW.

The discovery was made on July 5, 2010 at a rate of 140 liters/second and a temperature of 128 degrees Celsius.

The main line, including network upgrades from 2011 to 2017, is 62.6 km long. The interconnector to Unterhaching has a length of 5.3 km. Together with the lines of the individual house connections, we have a total length of over 105 km.

The ORC power plant, which has been in operation since December 18, 2014, has a maximum electrical output of 4.3 MW.

The trench for laying the pipes from the street to your house has a width and depth of about 1 x 1 metre.

On average, the work takes about 3 to 4 weeks. Depending on local conditions, the time required may vary.

You can withdraw from the contract at any time. Until detailed planning hasn't started, this will be free of charge. Withdrawal after that is still possible, but we will charge you for the planning costs.

The emergency service of Erdwärme Grünwald GmbH is available 365 days a year, 7 days a week, 24 hours a day. You can reach the hotline at 0800/7997987.

Erdwärme Grünwald GmbH has several redundancies. On the one hand, there is the possibility to obtain the heat via the interconnection with Unterhaching. Likewise, the demand can also be covered by an oil-fired boiler, which will be automatically activated as a first level support in the event of an error. In addition, we can also provide mobile heating centres in case of emergency.

In addition to the supply and return lines, an empty pipe is also installed. This can be used, for example, for a fibreoptic connection. A usage contract must be concluded with us before using the empty pipe.

Heat meters are installed in the stations and can be read remotely. On-site reading is not necessary.

At any time the connected capacity can be changed. All we need is the data sheet "Anlage 3/4" filled in by your heating engineer.

The transfer station is owned by Erdwärme Grünwald GmbH. It is the link between the connection line and the connection system of the customer's building.

The pumped water temperature is around 128 degrees Celsius. Your supply with district heating is therefore at your convenience.

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