ECO POWER ONE – A Milestone for the Energy Transition

Bollingstedt, Schleswig-Holstein, represents a significant milestone in the energy transition. With a power output of 103.5 MW and a storage capacity of 238 MWh, the facility, which was commissioned in June 2025, ranks among Germany’s largest battery energy storage systems. In August 2026, Swiss energy company Alpiq acquired ECO POWER ONE GmbH, including the battery storage facility. ECO STOR continues to be responsible for the technical and operational management of the facility.

Project Goals

• Integration of Renewable Energy: Surplus energy from wind and photovoltaic systems is efficiently stored and fed back into the grid as needed.
• Grid Stability: The battery balances grid fluctuations and enhances frequency stability by participating in control reserve markets.
• Regional Energy Security: ECO POWER ONE strengthens the energy infrastructure in a region with a high share of renewable energy production.

Innovative Technologies and Partnership

ECO POWER ONE is a flagship project realised through the collaboration of leading companies:

• Entelios optimises and markets the storage system’s flexibility on energy markets with its industry-leading expertise in flexibility trading.
• enspired, a specialist in AI-driven optimisation, leverages advanced algorithms to efficiently position the storage system in short-term and balancing reserve markets.
• ECO STOR provides the storage technology and ensures its technical implementation.

Technological and Environmental Innovation

• Technology: The large-scale battery storage system uses advanced storage solutions to sustainably improve energy security and the utilisation of renewable energy.
• Environmental Protection: The facility is surrounded by wildlife-friendly fencing and native vegetation, creating valuable habitats for flora and fauna. This approach combines technological excellence with ecological responsibility.

Voices on the Project

Stefan Englberger, Head of Commercial, ECO STOR: “Our collaboration with Entelios and enspired sets new benchmarks in the utilisation of large-scale storage systems and drives the energy transition forward.”

Jürgen Mayerhofer, CEO of enspired: “With digital solutions, we enable the efficient trading of battery storage flexibility, making a tangible contribution to grid stability.”

Fabian Becker, CEO of Entelios: “ECO POWER ONE demonstrates how innovative partnerships can be pivotal for the energy transition. We optimise the use of renewable energy while simultaneously strengthening energy security.”