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Cottbus

District heating plant, Cottbus (D)

Power Generation

Customer Stadtwerke Cottbus

Where Cottbus (D)

Solution Power generation

Sector Industrial | district heating

        
          As part of the energy transition underway in Europe and globally, and in line with the German government's plan to replace coal-fired power plants, we have built a plant that supplies electricity and heat using the most efficient plant technologies: all the heat will be used to power the city's district heating network (almost 100,000 residents).

Strengths

Energy transition

The new plant represents a significant step towards phasing out coal, providing a sustainable and reliable energy solution for the city of Cottbus.

High efficiency

Thanks to the use of advanced technologies, the plant achieves an overall efficiency of 90%, a significant improvement on the previous figure of 70%.

Reduction in emissions

The plant contributes to an annual reduction of 100,000 tonnes of CO₂, supporting Germany's climate targets.

Key Numbers

51,9 MW

Installed electrical power

50,5 MW

Heat output

300 MWh

Heat storage capacity

tonnes/year

100.000

Reduction in CO₂ emissions

Background

The city of Cottbus, located in Brandenburg, has historically based its energy production on coal. With the aim of decarbonising the energy mix, a project has been launched to build a natural gas-fired cogeneration plant, in line with the German government's guidelines for a sustainable energy transition.

        
          Today, Cottbus has a flexible, modern power plant capable of meeting the needs of its citizens, a challenging project, a turnkey solution by Cefla.

Challenges

Transition from coal to gas
Replace existing coal-fired power plants with an efficient gas-fired plant, ensuring continuity of energy supply.
Integration into the local energy system
Ensure that the plant integrates effectively with the existing district heating network, maintaining stability and reliability.

Project Tasks

Cefla, in joint venture with Atzwanger AG, oversaw the design, construction and commissioning of the plant. The project included the installation of five Jenbacher J920 gas engines, thermal storage tanks and auxiliary systems, ensuring efficient and sustainable operation.

Implementation

The following phases were carried out between 2019 and 2023:

Plant engineering and civil engineering works (foundation excavations, ground reinforcement, etc.)
Installation of 15 hot water tanks, 30 metres high
Installation of 5 Jenbacher J920 FleXtra gas engines, each with a capacity of 10 MW
Mechanical plant engineering for the engines
CE certification of the entire plant, including earthquake resistance
Commissioning

The plant went into operation in September 2022, supplying electricity and heat to around 100,000 residents of Cottbus. The project was completed on schedule and in line with the required quality standards, making a significant contribution to the region's decarbonisation strategy.

Despite the complexity of the project, its positive outcome demonstrates the enormous potential of cogeneration as an extremely efficient and effective technology for decarbonisation. Annual CO2 emissions are estimated to be reduced by approximately 100,000 tonnes, a 30% reduction for the immediate well-being of citizens.

While energy production from renewable sources such as wind or solar power is subject to strong fluctuations due to variable weather conditions, cogeneration technology is more reliable. In addition, thanks to the rapid start-up system of the engines (reaching 50 MW in just 3 minutes), the Cottbus plant can respond instantly to the city's needs.