Powering the world

Kraftwerke Mainz-Wiesbaden AG

Mainz-Wiesbaden, GERMANY

100MW for power + up to 96MW for district heating

“Unlike traditional CHP power plants based on coal-fired units or gas turbines, Wärtsilä gas engines can be started and stopped without limitations within just 2 minutes. This is our answer to the increasingly volatile power market that results from greater levels of renewable energy. It makes us the future partner of renewables.”
- Jörg Höhler, CTO at Kraftwerke Mainz-Wiesbaden AG


Profitable power generation in a market with increasing levels of renewables

Financial and timing risks in construction

Professional maintenance
of the power plant over
a long period of time


A ultra-flexible Smart Power Generation plant that allows for benefitting from volatile prices

Full EPC delivery

15-year maintenance agreement
that guarantees availability and starting reliability


Reliable district heat and power supply to the city of Mainz and revenues from short-term trading

One EPC supplier with full responsibility for both
timelines and costs

Guaranteed availability of power plant due to condition based monitoring

Smart Power Generation in Germany –enabling KMW AG to operate profitably in the increasingly volatile power market and provide climate-friendly district heating to the community.

Owing to the broad use of renewable energy sources as well as the utilisation of power generation for district heating, Germany has become one of Europe’s forerunners in the development of its energy system. The municipal energy producer Kraftwerke Mainz-Wiesbaden AG (KMW) recognises the benefits that greater flexibility in the generation of conventional power offers, as the share of renewables in the system steadily increases. Not only does this flexibility guarantee reliable power supply, but it also enables KMW AG to operate profitably in short-term power markets. Wärtsilä’s fast-acting power plant enables KMW AG to operate the plant in short-term markets with competitive prices, resulting in a new revenue stream for the company. Furthermore, KMW AG is complying with the renewed Combined Heat and Power (CHP) Act, whereby Germany has committed to increasing its share of electricity produced by CHP power plants to 25% by 2025. To meet this target, the act favours flexible and environmentally-friendly CHP power plants.


Main data

Customer Kraftwerke Mainz-Wiesbaden AG
Type Wärtsilä 34SG based CHP plant
Operating mode Combined heat and power, operating in the reserve markets
Gensets 10 x Wärtsilä 20V34SG
Total output 100MW for power + up to 96MW for district heating
Fuel Natural gas
Scope EPC and a 15-year maintenance agreement with performance guarantees. The maintenance agreement also includes online monitoring and support.
Delivered 2020

  • Read the whole story

Related downloads

This white paper showcases how flexibility enhances value in CHP portfolios in Germany.

Read about the KMW success story in this brochure.

Read about the KMW success story in this brochure.

Related links

Combined heat and power (CHP) plants

Our combined heat and power (CHP) plants are designed to meet the customer's specific needs, be it steam...
4 June 2019


Ensuring power plant performance and competitiveness.
25 March 2019

Guaranteed asset performance

Guaranteed asset performance is a solution where Wärtsilä guarantees reliability and availability of...
10 April 2017

Wärtsilä 34SG gas power plant

Agility and flexibility combined with high efficiency over the whole load range and in any operating...
9 July 2015

Energiewende: Germany’s quest to achieve...

European powerhouse Germany has ambitious and far-reaching plans to transform its energy system over...
25 June 2020
  • Twentyfour7. article

Wärtsilä Energy Transition Lab

An open-data test environment for the energy industry to understand the impact of the pandemic
23 November 2020
  • Application



Flexible combined heat and power plant (CHP)
25 June 2020
  • References


From Australia to Alaska, the Amazon to the Arctic - we match our customer's varying needs and requirements.
22 January 2015

Contact information

If you want to know more about the KMW project, please contact

Rana Mitra
Business Development Manager 
Wärtsilä Energy
+49 15157143105


© 2021 Wärtsilä