The Weiher Cogeneration Plant – BESS is a 15,000kW energy storage project located in Weiher, Saarland, Germany.

The electro-chemical battery energy storage project uses lithium-ion as its storage technology. The project was announced in 2015 and was commissioned in 2016.


The Weiher Cogeneration Plant – BESS is owned by STEAG (100%), a subsidiary of Kommunale Beteiligungsgesellschaft.

The key application of the project is frequency regulation.

Contractors involved

LG Chem and STEAG have delivered the battery energy storage project.

Additional information

This project is a collaborative effort between LG Chem and Nidec ASI, an expert in electrical motors and generators. The ESS storage systems, consisting of batteries from LG Chem and the PCS and EMS solutions from Nidec ASI, are being used by STEAG to generate primary balancing power. This energy storage capacity is used to offset short-term, unforeseen fluctuations on the grid. The six battery systems will be operated independently of the STEAG power plants. TUV SUD provided Technical due diligence services.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.