Engie and Return Expand German Energy Storage Flexibility Agreement to 400MW

en.Wedoany.com Reported - On September 14, ENGIE and European energy storage developer Return announced the expansion of their long-term virtual flexibility purchase agreement (vFPA) in Germany, raising the contracted battery energy storage flexibility capacity from the previous 100MW to 400MW. The additional capacity does not correspond to a single energy storage plant, but rather comprises multiple battery energy storage facilities at different locations in Germany owned by Return, which are aggregated through a Virtual Flexibility Portfolio to provide capacity and dispatch interfaces to ENGIE. ENGIE will use these energy storage resources to participate in the wholesale electricity market and ancillary services market.

This cooperation is an expansion based on the first 100MW German vFPA signed by both parties in February this year. The first agreement began execution in 2027, adopting a long-term fixed-price structure, with Return aggregating energy storage assets distributed across different regions of Germany into a virtual energy storage portfolio. ENGIE does not need to sign capacity contracts with each project separately, and can obtain the corresponding energy storage flexibility through a unified interface. After this expansion, the scale of cooperation between the two parties in the German market has increased to 400MW, equivalent to adding 300MW of flexibility capacity on top of the original contract.

Under the existing cooperation model between the two parties, Return is responsible for developing, owning, and operating the underlying battery energy storage assets, and completing capacity aggregation across different projects through its own technology platform; ENGIE is responsible for injecting the obtained flexibility into the German wholesale electricity market and ancillary services market, and optimizing based on electricity prices, system balancing, and customer supply needs. This contract structure differs from traditional fixed-capacity leasing for a single energy storage site, with the core transaction object being a "virtual flexibility portfolio" formed by multiple energy storage facilities.

When the first 100MW agreement was signed, both parties had already clarified that its underlying assets come from distributed large-scale battery energy storage projects within Germany. After this expansion to 400MW, the contract still follows the multi-project aggregation approach and does not lock the additional 300MW of capacity to a specific plant. Therefore, this agreement cannot be interpreted as a "new 400MW energy storage plant" or a single-project equipment order. At this stage, publicly available information has also not disclosed the specific number of energy storage stations included in the agreement, total MWh capacity, locations of each site, or contract amount.

Return is expanding its independent energy storage asset portfolio in Germany. Among these, the company's first German large-scale energy storage project in Brietlingen, Lower Saxony, has a scale of 13MW/25MWh and is currently under construction; Return is also continuously developing new large-scale battery projects in Germany and expanding its asset pool through acquisitions and independent development. Such distributed assets can in the future form a unified energy storage portfolio through its technology platform, providing long-term flexibility services to large energy traders.

ENGIE is also continuously expanding its energy storage business in Europe. As of this summer, the company's globally operational and under-construction energy storage capacity reached 10.7GW; in July and August alone, newly added battery energy storage projects in Europe reached approximately 1.1GW/3.3GWh, covering 7 countries. Germany is one of ENGIE's important markets for large-scale energy storage, renewable energy trading, and 24/7 green power solutions.

The scope of cooperation between the two parties is no longer limited to Germany. In July this year, ENGIE and Return also signed a 10-year long-term energy storage flexibility agreement in Spain, initially covering 55MW of battery energy storage capacity. After the German contract increased from 100MW to 400MW, the cooperation model between the two parties is expanding from the first batch of virtual energy storage contracts in a single country to a multi-project, multi-market flexibility procurement system.

The newly added milestone this time is the expansion of the German vFPA scale from 100MW to 400MW. The next stage will revolve around the inclusion of Return's new energy storage assets into the virtual portfolio, energy storage capacity aggregation, and ENGIE's market dispatch, while the actual underlying projects will still enter the contract execution system separately according to their respective construction, grid connection, and operational progress.