System integrators Rolls-Royce and Fluence have secured BESS orders for projects in Latvia and Poland, respectively, while CATL has partnered with Merus Power for 3GWh of deployments across the Northern Europe region.
And in related news, the renewables arm of Ukraine-based DTEK has secured financing for its 133MW Trzebinia BESS in Poland (also a Fluence-supplied project).
Merus Power and CATL partner on deployments
Finland-based power solutions firm Merus Power and the world’s largest battery company, China-based CATL, have signed a strategic cooperation for the delivery of approximately 3GWh of battery energy storage systems (BESS) to Northern Europe.
The press release used both ‘Northern Europe’ and ‘Nordic Europe’. The Nordics comprises Iceland, Norway, Sweden, Denmark and Finland, while Northern Europe includes the Nordics plus the UK, Ireland, and the Baltic nations Latvia, Lithuania and Estonia.
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Merus has already deployed 500MWh of solutions in Northern Europe using CATL’s battery technology. The vast majority is in Finland, although the company is expanding outside of its home base, recently winning a project in Latvia.
While not specified in the press release, the cooperation likely involves CATL supplying entire BESS units to Merus Power. Merus then provides EPC, system integration, operations & maintenance (O&M) and inverters.
Merus also builds its own inverters, which may be key here, considering that the EU recently banned Chinese inverters from solar and BESS projects which have received EU grant money. Another Chinese BESS provider, Hyperstrong, recently partnered with European inverter firm SMA. Note that CATL does not manufacture inverters.
“CATL’s leading battery technology and experience in demanding energy storage applications combine with Merus Power’s strong local system expertise, grid inverter technology, and delivery capabilities,” said Hank Zhao, managing director of Western Europe at CATL.
Zhao has given Q&As to journalists at trade show Intersolar Europe the past two years, attended by Energy-Storage.news both times (see our coverage here: 2024 and 2025).
Rolls-Royce to deploy 490MWh for Sunly in Latvia
System integrator Rolls-Royce has signed contracts with renewables owner-operator Sunly for the construction of four BESS in Latvia totalling 490MWh. Rolls-Royce will supply its mtu EnergyPack for the four projects. The first of them will be at Sunly’s operational Valmiera solar project, and is set for commissioning in Q2 2027.
Rolls-Royce also deploys white-labelled BESS from lithium-ion OEMs, including from CATL, though tends not to reveal its supplier for specific projects.
Like the rest of the Baltics, Latvia’s storage market is being driven by high ancillary service prices, particularly since the three countries disconnected from Russia’s BRELL network in 2025.
OX2 using Fluence for 120MWh Poland project
In related news, developer and EPC firm OX2 has enlisted system integrator Fluence for is 50MW/120MWh Poland BESS project, on which it announced construction last week.
Like most large-scale projects in Poland, it has a 17-year capacity market (CM) contract, won in 2022’s auction meaning delivery from 2027 onwards.
The project will use Fluence’s Smartstack, its AC block product which it launched in February last year.
Poland is proving fertile ground for the new product, also winning a contract with Ukraine-based DTEK for its project there.
DTEK’s DRI secures financing for Poland project
In fact, DRI has secured a PLN 470 million (€111 million/US$128 million) non-recourse financing package for the 133MW/622MWh Trzebinia BESS in Poland, which Fluence is also supplying. That project also has a CM contract starting in 2027.
The financing package was put together by Erste Bank Polska, PKO Bank Polski and UniCredit. It includes a long-term term facility backed with a guarantee provided from Polish export credit agency KUKE S.A. on behalf of the Polish State Treasury under the ITE (Energy Transformation Investment) programme.
Murat Cinar, CEO of DRI, said: “This transaction is a strong endorsement of DRI’s ability to structure complex, bankable projects and to attract leading international and domestic financial institutions, as well as public guarantee schemes.”
Our publisher Solar Media will hold the Energy Storage Summit Central Eastern Europe (CEE) 2026 on 6-7 October in Warsaw, Poland.
