Delta Capacity brings together market leaders in battery technology, energy trading, construction, and engineering to build out its Finnish flagship BESS
Munich / Teuva, Finland, September 9th 2026 — Delta Capacity announces strategic partnerships with Sungrow, NEPower, and Despro, leading names in battery storage technology, energy trading, electrical construction, and engineering, to deliver Karppio, a 125 MW / 300 MWh (2-hour duration) battery energy storage system (BESS) under construction in Teuva, Finland. Karppio was acquired as a ready-to-build (RTB) asset from Helios Nordic Energy and is being developed by Delta Capacity together with Strioga Family Foundation, with commissioning planned for Q4 2027 and Delta Capacity serving as long-term asset manager.
By bringing in Sungrow, NEPower, and Despro, Delta Capacity has secured a delivery team of established, market-leading partners across the full BESS value chain. Sungrow, a globally leading PV inverter and energy storage system supplier, will supply the battery energy storage system technology. NEPower, a Nordic electrification specialist, will serve as balance-of-plant (BoP) contractor, delivering electrification and substation works. And Despro will provide owner's engineering services as local engineering experts in the Finnish market. Once operational, Karppio will provide critical grid flexibility, frequency regulation, and balancing services to Finland's power system as the country's share of wind and solar generation continues to grow.
"Karppio is exactly the kind of project the Nordics need right now: real scale, backed by a team that can deliver it properly. With Strioga alongside us as co-investor and our strategic partner, and Sungrow, Centrica Energy, NEPower, and Despro bringing the technology, trading, construction, and local engineering expertise, we have the right partners in place to get this built and generating value for the Finnish grid on schedule." — Patrik Hes, CEO, Delta Capacity.
“Our strategic partnership with Delta Capacity combines Sungrow’s proven energy storage technology with a partner that has the ambition and expertise to deliver at scale. Karppio is another important step in our shared commitment to the Nordic energy market, where flexible and reliable storage will be essential to integrating growing volumes of renewable energy and strengthening grid resilience.” - Moritz Rolf, Vice President Sungrow Europe for DACH, Nordics, Benelux and Turkey.
Finland's power system is among the cleanest in Europe, but rapid growth in wind and solar generation is increasing the need for flexible, dispatchable assets that can balance supply and demand in real time. Battery storage projects like Karppio are central to that transition, and Delta Capacity's Nordic pipeline — including the recently completed Ånge project in Sweden — reflects the scale of investment now flowing into the region's grid infrastructure.
About Sungrow
Sungrow, a global leader in renewable energy technology, has pioneered sustainable power solutions for over 29 years. As of December 2025, Sungrow has installed over 1,000 GW of power electronic converters worldwide. The company is recognised as the world's most bankable PV inverter and energy storage company (BloombergNEF). Its innovations power clean energy projects across the globe, supported by a network of 520 service outlets guaranteeing excellent customer experiences. At Sungrow, we're committed to bridging to a sustainable future through cutting-edge technology and unparalleled service. For more information, visit www.sungrowpower.com/en.
About Delta Capacity
Founded in 2022, Swiss-based Delta Capacity is driven by its vision to develop, acquire, own, and operate utility-scale battery storage across Europe. The company is scaling quickly while maintaining a consistent focus on asset quality — prioritising designs that support high availability, efficient performance, and strong operating outcomes. The rapidly growing team brings decades of experience across large-scale infrastructure, renewable energy, energy trading, and software development. Delta Capacity currently has nearly 1000 MWh under construction and targets the build-out, commissioning, and operation of more than 6 GWh of flexible assets by 2030.
About Strioga Family Foundation
The Strioga Family Foundation was established in 2025 by the family behind Lithuanian renewables developer E Energija Group, with a mission to help prevent global climate change through responsible, sustainable investment in Europe and beyond. Backed by a EUR 100 million endowment, the Foundation deploys capital into projects, businesses, and start-ups that deliver measurable climate, energy, and resilience outcomes.
About NEPower
NEPower is a specialist in the electrical sector, providing comprehensive electrification services for renewable energy and substation projects across the Nordic countries. NEPower always emphasises safety, quality, and customer satisfaction in everything it does.
