Alpiq Acquires 238 MWh Bollingstedt BESS in Germany

Swiss energy company Alpiq has expanded its European storage footprint by acquiring the Bollingstedt battery energy storage system (BESS) in Schleswig-Holstein, Germany. The acquisition, made from project company ECO POWER ONE GmbH, marks Alpiq's third operational large-scale storage system and its very first in the German market. Financial terms of the transaction were not disclosed, but ECO STOR will retain the technical and operational management of the facility.

Bollingstedt BESS Specifications and Operations

The Bollingstedt facility boasts a substantial capacity of 238 MWh and a power output of 103.5 MW, providing a duration of approximately 2.3 hours. The system was successfully connected to the grid in March 2025 and commenced commercial operations in June 2025. It is actively providing primary and secondary reserve, engaging in day-ahead and intraday trading, and supplying reactive power and black start capabilities to the grid.

Innovative Flexible Connection Agreement (FCA)

A notable aspect of the Bollingstedt project is its grid connection strategy. The system operates under a Flexible Connection Agreement (FCA) with the local distribution system operator, Schleswig-Holstein Netz. This agreement allows the BESS to be connected in capacity-constrained areas, which are often optimal for renewable energy integration but traditionally difficult for new large-scale loads or generators to access.

"Flexible Connection Agreements are a game-changer for BESS developers in Germany, unlocking sites in congested grid areas that would otherwise be inaccessible for utility-scale storage."

However, the FCA comes with operational caveats. It may limit full-power dispatch during peak market hours if the local grid is congested. Despite this, the strategic location and the 238 MWh capacity make Bollingstedt a highly valuable asset for Alpiq's growing portfolio of flexible energy assets in Europe.

This article was assisted by AI analysis. Please refer to the original source for official information.

Source: Techzeitgeist