A roundup of large-scale BESS news from in and around the Nordic region, with Sweden-based Flower building a project in Germany, Volvo launching one in Sweden and Delta Capacity securing a toll for one in Finland.
Flower starts building Hamburg’s largest BESS
Sweden-based battery energy storage system (BESS) platform Flower has stared building a 100MW/400MWh project in Bergedorf, Hamburg, Germany. The four-hour system will be Hamburg’s largest battery storage facility and the largest BESS located within a major German city, Flower said.
The news comes ahead of the Energy Storage Summit Germany 2026, which runs in just a few working day’s time, on 15-16 September 2026 in Berlin (use our code ESN20 for a 20% discount on tickets).
The start of construction on the Hamburg project was marked in a ceremony yesterday (9 September) attended by numerous stakeholders including Katharina Fegebank, Second Mayor of Hamburg and Senator for Environment, Climate, Energy and Agriculture. Executives from the project’s offtaker Engie and state agency Hamburg Invest also attended.
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Flower launched in 2024 ago as primarily an optimiser and virtual power plant (VPP) platform. But, CEO Diklev explained to us at the time, it was also looking to own and operate projects itself to prove out its long-term optimisation and offtake model.
The firm also has separate large-scale projects in both Germany and Sweden.
Volvo Group announces Sweden project
Commercial vehicle and industrial equipment company Volvo Group will deploy 70MW/260MWh of BESS capacity at its Marienstad energy park, where it is developing a battery gigafactory.
It said that in a first step, large-scale quantities of battery storage to support the grid will be installed. For this, it will use BESS products from within the Volvo Group.
The site will also be used as a customer demonstration site for its technologies and support the company’s decarbonisation plans. The energy park is expected to become operational during 2027 and will provide flexibility and stability to the Swedish electricity market.
While the press release is light on details, it’s worth noting that the company has pursued BESS technology development from a few different angles.
It made a series of announcements in 2023 though has been relatively quiet since then.
This included second life BESS projects, including with UK startup Connected Energy.
It also acquired US battery pack firm Proterra out of bankruptcy. Subsidiary Volvo Penta meanwhile launched a BESS sub-system targeting industrial applications.
Delta Capacity agrees partial toll for 300MWh Finland BESS
BESS owner-operator Delta Capacity has entered into a toll with Centrica Energy for part of the 125MW/300MWh Karppio project in Teuva, Finland.
The project was acquired by Delta along with the Strioga Family Foundation in July this year.
Centrica Energy is part of the large UK power firm and utility Centrica, and will trade and optimise the asset in the Nordic power market. Centrica already trades a 160MWh project for Delta in Sweden, the largest in the Nordics.
The Finland project will come online in Q4 2027.
Launching September 2026 in Berlin, Energy Storage Summit Germany is a new standalone event dedicated to Germany’s energy storage market. Bringing together investors, developers, policymakers, TSOs, manufacturers and optimisation specialists, the Summit explores the regulatory shifts, revenue models, financing strategies and technology innovations shaping large-scale deployment. With Germany targeting 80% renewables by 2030, it offers a focused platform to connect with the decision-makers driving the Energiewende and the future of utility-scale storage.
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