Enery is proud to announce the successful commissioning of the Rummu Battery Energy Storage System (BESS), a state-of-the-art 9 MW / 18 MWh storage facility co-located with the operational 20 MW PV plant. This integrated project marks a significant milestone in Enery’s strategic expansion in the Baltic energy markets, pairing renewable generation with advanced energy storage to unlock new dimensions of flexibility, reliability, and economic value.
The Rummu PV plant, located in Harju County, became operational in September 2023 and was one of Enery’s first utility-scale solar assets in Estonia. Recognizing the need for dynamic grid support and market optimization, Enery initiated the retrofitting of a co-located battery system, which came online in April 2025. Together, these assets form a hybrid system capable of delivering stable renewable power and participating in ancillary services’ markets.
Technical and Financial Innovation at the Core
With a configuration of 9 MW of power and 18 MW/h of capacity, the Rummu BESS is engineered to handle high-frequency charge and discharge cycles with seamless responsiveness.
What sets the Rummu BESS apart from conventional storage projects is that it is fully owned, operated, and optimized by Enery as part of our integrated business model. The asset is managed through an AI-based 24/7 cross-market optimization platform that evaluates real-time and forecasted price signals and asset availability across multiple markets, enabling automated and revenue-maximizing dispatch decisions.
As Enery entered the BESS market ahead of many competitors, the financing of the Rummu asset represented a pioneering initiative. It was the first time Enery’s local financing partners engaged in supporting this type of infrastructure, making the endeavor both a learning and teaching experience. This collaboration laid the groundwork for battery storage to emerge as a bankable asset class in Estonia and potentially across the Baltics. Rummu BESS’s was financed by Swedbank, who recognized early on the strategic advantage of being a first mover in this evolving market. Their support was instrumental in contributing to the stabilization of the energy system through the deployment of cutting-edge energy solutions.
Technology as a Commercial Edge
“Rummu is not only a technical achievement, but a strategic cornerstone,” said Margus Potisepp, Head of Enery Estonia. “It represents the convergence of digital intelligence, grid flexibility, and clean energy—all tailored to a region that’s fast becoming a key player in Europe’s renewable landscape.”
The cross-market optimization model behind Rummu’s strong performance isn’t limited to Enery-owned assets. It’s a key part of our Enery Portfolio Optimization services, which are also available to third parties renewable and storage assets in Estonia. This approach is central to Enery’s broader offering for renewable and storage owners and industrial consumers seeking to improve the performance of their generation and storage assets and navigate today’s increasingly volatile and decentralized energy markets.
“This is particularly relevant for the Baltics,” added Margus Potisepp, “where high renewable penetration, market coupling, and price volatility make intelligent trading and flexible response a must-have, not a luxury.”
A Scalable Vision for the Region
Enery sees the Baltics as a region with strong potential—not only due to its ambitious decarbonization goals but also supportive regulatory environment. The Rummu BESS is a template for future projects in the Baltics, and beyond, where co-location and digital integration will be key to extracting full value from clean energy infrastructure.
Looking ahead, Enery plans to continue deploying hybrid renewable-storage systems and building on the existing asset base across Central and Eastern Europe, with a strong focus on software-driven asset optimization, open digital platforms, and partnership-based scaling.
About Enery
Enery is an independent renewable energy provider dedicated to supplying its customers with reliable, affordable, long-term green energy. With a diversified green fleet currently generating almost 700 GWh of clean electricity from 490 MW and powering 567,026 households, Enery is at the forefront of driving the CEE region’s transition to sustainable energy. The company’s ambitious plans include ongoing development projects with more than 8 GW in 11 countries. With its diverse and multidisciplinary team of 30 nationalities, Enery is focusing on developing, constructing, and operating renewable energy projects by integrating environmental, social, and governance (ESG) factors into every aspect of day-to-day business.
About Enery Portfolio Optimization
Enery Portfolio Optimization (EPO), the licensed power trader of Enery, specializes in optimizing the revenue streams of utility-scale renewable and storage assets in Central & Eastern Europe and supplies green electricity to industrial consumers. EPO offers tailored solutions for wind and solar energy producers who want to maximize their energy performance and reduce balancing costs, renewable energy buyers who need green electricity, risk hedging, and more, and BESS owners who want to maximize the value of their assets. EPO provides market access and balancing optimization for 8 Enery-owned and 19 third-party renewable energy assets with total 700 MW, eight third-party battery storage systems with total 624 MWh, including one of the largest in Europe and supply 100% green energy to industrial customers across four European markets (Estonia, Austria, Romania and Bulgaria).
Enery Press Office
Email: press@enery.energy