Rolls-Royce Deploys mtu Battery Storage in Latvia

Rolls-Royce Power Systems and Baltic renewable energy developer Sunly have entered into an agreement to deploy four large-scale battery energy storage systems in Latvia with a combined capacity of 490 MWh. The projects are designed to support grid stability, renewable energy integration, and energy balancing as the region increases its share of solar and other variable power generation sources.

Cooperation for Renewable Energy Infrastructure
The cooperation combines Sunly's role as a renewable energy developer and project owner with Rolls-Royce Power Systems' expertise in battery energy storage systems and energy management software. The projects form part of a broader effort to strengthen energy infrastructure in the Baltic region while improving the integration of renewable electricity into transmission and distribution networks.

One of the sites is located at Sunly's hybrid energy park in Valmiera, Latvia, where solar generation will be combined with battery storage. Hybrid energy systems are increasingly used to address fluctuations in renewable power output by storing surplus electricity and releasing it during periods of higher demand.

Battery Storage Technology and Responsibilities
Rolls-Royce will supply mtu battery energy storage systems together with the mtu EnergetIQ energy management platform. The battery systems will provide a total storage capacity of 490 MWh across four locations.

The energy management platform controls charging and discharging operations based on grid conditions, renewable generation levels, and demand requirements. This functionality supports grid balancing, frequency stabilization, and more efficient utilization of renewable energy resources.

Sunly is responsible for project development, renewable energy integration, and operation of the energy assets, while Rolls-Royce acts as the technology provider and system integrator. As the main contractor for the storage installations, Rolls-Royce is responsible for supplying and integrating the battery systems and associated control infrastructure.

Deployment Across Latvia and the Baltic Region
The first battery storage installation is being deployed at the Valmiera hybrid energy park in Latvia. Commissioning is scheduled for the first quarter of 2027, with the remaining three storage sites expected to enter operation during 2027.

The battery systems will be integrated with existing and planned renewable energy assets to support grid operations and improve the availability of renewable electricity. The projects are designed to meet cybersecurity requirements applicable to critical energy infrastructure.

Beyond Latvia, Sunly and Rolls-Royce have signed a memorandum of understanding covering a further 300 MWh battery storage project in Risti, Estonia. The cooperation therefore extends beyond a single market and supports the development of regional energy storage infrastructure.

Applications and Operational Benefits
The primary application areas include renewable energy integration, grid stabilization, energy shifting, and support for electricity transmission systems.

Battery energy storage systems can absorb excess electricity generated during periods of high renewable output and release it when production decreases or demand rises. This operational flexibility can reduce renewable energy curtailment and support more stable grid operation.

For grid operators and renewable energy developers, storage systems also provide additional tools for balancing supply and demand while supporting energy security objectives.

Expected Impact on Baltic Energy Systems
The four Latvian projects represent 490 MWh of battery storage capacity. Together with additional projects in Latvia, Lithuania, and Estonia, the installed battery storage capacity supplied by Rolls-Royce in the Baltic states is expected to exceed 1,500 MWh.

A battery energy storage system supplied by Rolls-Royce has already been operating for Latvian transmission system operator Augstsprieguma tikls (AST) since 2025. The latest projects build on existing deployment experience and contribute to the expansion of large-scale energy storage infrastructure required for higher penetration of renewable energy across the Baltic electricity network.

Edited by Aishwarya Mambet, Induportals Editor, with AI assistance.

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