100 MW / 400 MWh in Bergedorf: Flower from Sweden brings Hamburg’s largest battery storage project to construction readiness
The Swedish energy tech company Flower has transferred a 100 MW / 400 MWh battery energy storage system (BESS) project in Bergedorf to construction-ready status and, together with local stakeholders, secured the necessary grid connections and permits.
The project will not only create by far the largest battery storage system in the city in Hamburg at the moment, but also the largest battery storage system within a major German city according to current knowledge. Commissioning is planned for the end of 2028. In the future, the storage system will help stabilize the power grid, make renewable energies more usable and integrate electricity peaks from wind and solar energy more efficiently into the energy system. This means that the energy transition will be implemented in practice a good deal further.
Energy independence is not only achieved through generation, but also through the storage of electricity. Thus, the BESS project in Bergedorf offers a valuable part of the energy policy security architecture of the city of Hamburg. Battery storage systems are becoming increasingly important for the next phase of the energy transition: the more the share of renewable energies increases, the more often phases with very high feed-in occur. Without sufficient storage and flexibility solutions, electricity cannot always be used sensibly in such situations, is curtailed or temporarily pushes prices on the electricity exchange into negative territory. Storage systems such as Flower’s planned BESS project can absorb this energy and provide it at a later date.
“This is an important milestone in our efforts to scale battery storage in Germany and support the stability of the national and regional electricity system. My sincere thanks go to the district of Bergedorf, the Hamburg energy networks and all our local partners who have helped to make this project a reality,” says John Diklev, founder and CEO of Flower.
Since 2023, Flower’s in-house asset development team has led a comprehensive development process for the project, including permitting procedures, stakeholder management and grid connection approvals.
“As with all of our internally developed projects, this project has been developed in close collaboration with municipalities, property owners and grid operators to ensure that it adds value both locally and to the wider energy system,” says Annie Olofsson, VP Asset Development at Flower.
Flower was supported in the settlement process by Hamburg Invest. As a one-stop agency, the city’s economic development agency supports companies that want to settle in the Hamburg economic area with a comprehensive, free service. In the case of Flower, Hamburg Invest advised in particular on the search for space and location development. Scaleup Hamburg also supported the process at an early stage. The new location in Bergedorf is ideal for this, as the commercial area of approx. two hectares in Allermöhe is de facto out of the question for other commercial use due to soil-specific characteristics, but is very suitable and located for a battery storage system.
“Our goal is to attract innovative companies to Hamburg and make it as easy as possible for them to find the right location. The location in Bergedorf is particularly suitable: with its proximity to the HAW Hamburg Energy Campus and the emerging Bergedorf Innovation Park, which is geared towards renewable energies, among other things. It is precisely such projects that show very well how Hamburg brings together sustainable economic development and the energy transition,” says Dr. Rolf Strittmatter, Managing Director of Hamburg Invest.
Expansion of presence in Germany and Europe
Flower recently announced the acquisition of a 63 MW / 257 MWh BESS project in Döllnitz, Saxony-Anhalt. At the same time, the company has transferred a system with 10 MW / 20 MWh in Saarland to construction-ready status and is developing several other BESS projects throughout Germany.
Flower owns four operating BESS sites in its home market of Sweden with a total capacity of 63 MW. Three further internally developed projects with a total of 70 MW are scheduled to go into operation there in 2026. In addition, the company is developing large-scale battery storage projects in the Netherlands, France and Belgium, building a multi-GWh development pipeline in Europe.
