Rolls Royce wins contract from Sunly for large-scale battery storage in Latvia and strengthens its position as the leading supplier of battery storage in the Baltic states

Rolls-Royce Power Systems and Sunly have signed contracts for the construction of four large-scale battery storage systems in Latvia, with a total capacity of 490 MWh. The first hybrid energy park, featuring mtu EnergyPacks and solar panels (see graphic with a hybrid power plant) will be commissioned in Valmiera in 2027.

• mtu storage systems and automation support grid stability and integration of renewable energy in Latvia
• Rolls-Royce now the largest supplier in Baltic states with systems offering over 1,500 MWh of capacity

Rolls-Royce Power Systems and Sunly, a renewable energy platform in the Baltic region, have signed contracts for the construction of four large-scale battery storage systems in Latvia with a total capacity of 490 MWh. The agreement was announced at the opening of Sunly's new solar park in Valmiera, one of the first hybrid energy parks in Latvia. The mtu EnergyPack in Valmiera will be commissioned in the first quarter of 2027, with the remaining three sites following in the course of 2027. Rolls-Royce has already secured further contracts in Latvia and Lithuania, establishing itself as the leading supplier of battery storage systems in the Baltic states.

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Our aim is to build an energy system that serves people - not just when the sun is shining. By combining solar power generation with battery storage, we can supply energy when it is needed. This makes renewable energy more reliable and less dependent on the weather. We have to meet strict cybersecurity requirements. It was therefore crucial for us to find a European partner that has already demonstrated its expertise in Latvia."

Rolls-Royce will utilise its proven mtu EnergyPack and its mtu EnergetIQ software platform, which controls when energy is stored and when it is released, in order to maintain grid stability, integrate renewable energy sources and balance supply and demand.

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Our strength lies in providing integrated, high-performance battery energy storage systems. As a general contractor, we offer our customers a single point of contact, which helps them reduce risks and complexity, ensure profitable performance and maximise long-term asset value. Together with Sunly, we are delivering large-scale battery storage systems that will play a crucial role in strengthening grid stability and energy security in the Baltic region."

Sunly and Rolls-Royce have also signed a memorandum of understanding to extend their partnership to Estonia - with a 300 MWh project in Risti. Rolls-Royce Power Systems has now supplied mtu battery storage solutions for over 200 projects worldwide. In the Baltic states alone, capacity will exceed 1,500 MWh, once the current projects are completed, positioning Rolls-Royce as the leading provider of battery storage in the Baltic region. A large-scale battery storage system from Rolls-Royce has been in operation since 2025 for the Latvian transmission system operator Augstsprieguma tikls (AST). In addition, Rolls-Royce has also secured contracts in Lithuania.

Press photos for download can be found at Media Centre (mtu-solutions.com)

1. Rolls-Royce is a force for progress; powering, protecting and connecting people everywhere. Our products and service packages help our customers meet the growing need for power across multiple industries; enable governments to equip their armed forces with the power required to protect their citizens; and connect people, societies, cultures and economies together.
2. Rolls-Royce has a local presence in 47 countries and customers in over a hundred more, including airlines and aircraft leasing companies, armed forces and navies, and marine and industrial customers.
3. Through our multi-year transformation programme, we are building a high-performing, competitive, resilient and growing Rolls-Royce. We are building the financial capacity and agility to allow us to successfully develop and deliver the products that will support our customers through the energy transition.
4. Annual underlying revenue was £20.1 billion in 2025, and underlying operating profit was £3.46 billion.
5. Rolls-Royce Holdings plc is a publicly traded company (LSE: RR., ADR: RYCEY, LEI: 213800EC7997ZBLZJH69).
6. Rolls-Royce Power Systems is headquartered in Friedrichshafen in southern Germany and employs more than 11,000 people. The product portfolio includes mtu-brand high-speed engines and propulsion systems for ships, heavy land, rail and defence vehicles and for the oil and gas industry. The portfolio also includes diesel and gas systems and battery containers for mission critical, standby and continuous power, combined generation of heat and power, and microgrids. With its climate friendly technologies, Rolls-Royce Power Systems is helping to drive the energy transition.

https://www.rolls-royce.com

Sunly is an integrated energy infrastructure platform that combines renewable generation, storage and large-scale electricity demand, turning clean power into a competitive advantage for electrified industry and digital infrastructure. Sunly operates in the Baltics and Poland. Sunly employs nearly 200 people and is backed by investors including Mirova, Vardar, EBRD, EIB, mBank, and Rivage Investments.

Media contact: Liisa Rohila; Head of Brand & Communications: liisa.rohila@sunly.ee