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Stuttgart-Gaisburg combined heat and power plant

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From 2017 to 2019 the Stuttgart-Gaisburg combined heat and power plant has been fundamentally modernised in order to generate even more environmentally friendly and efficient heat for the Stuttgart district heating network. A considerably smaller, more efficient, and lower-emission gas-fired heating plant replaced the previous combined heat and power plant, which was mainly coal-fired, to fulfil the peak and reserve function important for the Stuttgart/Mittlerer Neckar district heating region.

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The year the plant was built

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3 gas generators, 1 boiler plant, 1 heat accumulator (with 300 MWh capacity)

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of gross electrical power

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of power capable of being drawn off for district heating

Modernisation

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Project introduction

The Gaisburg site has been generating electricity and heat for the Stuttgart region for over 70 years. Together with the combined heat and power plants Stuttgart-Münster and Altbach/Deizisau, it forms the Mittlerer Neckar district heating network and supplies over 25,000 homes, 1,300 companies, and 300 public facilities in Stuttgart and the region with heat.

Over the years, the generation structure of the Stuttgart-Gaisburg combined heat and power plant has been continuously changing. Today, the main function of the district heating network is to cover periods of high demand in winter and to serve as a reserve for the two larger locations of the district heating network. The most recent modernisation ensures that the Gaisburg site will perform these tasks even more efficiently and in a more environmentally friendly manner. This ensures that citizens will continue to have a secure supply of district heating in the future.

In order to make the plant fit for the future in terms of the energy revolution the following components were used:

  • gas-fired peak-load and reserve boilers for securing the Mittlerer Neckar district heating pipeline
  • the integration of a heat accumulator in order to optimally supplement the use of the other generation plants along the Mittleren Neckar Line and the peak and reserve boilers
  • a small gas-fired combined heat and power (CHP) plant
  • the construction of new district heating stations
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The Stuttgart-Gaisburg site with a 3D image of the built power plant (in red).
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This diagram shows how the new combined heat and power plant works.
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Technology

In a combined heat and power plant, useful heat energy is generated in addition to electrical energy in a coupling process. Because this is usually to be fed into a district heating network, combined heat and power plants are often located in urban conurbations with high heat requirements. The heat energy is routed directly to households and companies via district heating pipelines and supplies them with environmentally friendly and reliable district heating.

At the centre of the new combined heat and power plant plant is the boiler plant, which consists of several boilers. Water is heated to very high temperatures in a closed circuit by burning natural gas or, in exceptional cases, light fuel oil. The hot water is then passed through heat exchangers. They transfer the high temperature to the water circuit of the district heating network. Houses and apartments in Stuttgart and along the Neckar river are supplied with heat.

Through the newly built co-generation plant, the combined heat and power plant can also generate electricity in addition to heat: For this purpose, a combustion engine powered by natural gas drives a generator; the electricity generated can then be fed into the power grid. The heat of the engine and the exhaust gases is conducted through a heat exchanger and thus also used for the district heating network.

Approach

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Project phases

This is where we inform you about important events and milestones relating to the modernisation of the Stuttgart-Gaisburg combined heat and power plant. You will find the latest information here on the timetable for the planning and approval process as well as the progress of the construction work.

Construction diary

Construction highlights

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Frequently asked questions

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The power plant complex in Gaisburg – a coal-fired plant and gas-fired plants for heat and power supply – had been getting on in years. Therefore there was a need for optimisation and modernisation in order to make the plant fit for the future in terms of energy system transformation.

Why did EnBW modernise the Stuttgart-Gaisburg thermal power plant?
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Our combined heat and power plants in the district heating network supply around 25,000 homes, 1,300 companies, and 300 public buildings via a 260 km district heating network along the Neckar valley from Plochingen via Altbach/Deizisau and Esslingen to Stuttgart.

Who is supplied with district heating in Stuttgart?
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District heating is an affordable form of heat supply with high price stability. At the same time, it is a safe, climate-friendly, and energy-efficient technology that fits perfectly into the energy revolution. The advantages of district heating over local heating systems are particularly evident in the densely populated boiler location of Stuttgart.

How do citizens benefit from district heating?
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The modernisation of the combined heat and power plant at the Stuttgart-Gaisburg site offers the following advantages:

  • The new gas-fired plants are more flexible and environmentally friendly than the existing plants and reduce the output of, among other things, CO₂ emissions. The modernisation of the combined heat and power plant thus contributes to achieving the climate protection targets.
  • The Gaisburg location is and remains an important and indispensable component of the district heating network of the Mittleren Neckar Line, which connects heating power plants and customers along the Neckar and guarantees an environmentally friendly and reliable district heating supply.
  • After modernisation, the Stuttgart-Gaisburg combined heat and power plant will integrate much better into the cityscape. By using climate-friendly natural gas, the existing coal store will no longer be needed. With the space freed up, there will be medium-term urban development opportunities for the neighbouring districts and the city as a whole.
What are the advantages of modernising the combined heat and power plant?
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Modernisation of the Stuttgart-Gaisburg combined heat and power plant (Heizkraftwerk 3)
Modernisation of the Stuttgart-Gaisburg combined heat and power plant
Modernisation of the Stuttgart-Gaisburg combined heat and power plant: Information event as part of the early public consultation process