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Press Release02 December 2025Espoo
A significant step in the electricity market: The Nurmijärvi Battery Energy Storage System participates in all electricity and reserve markets and promotes the development of a sustainable energy system
Image: Siemens Osakeyhtiö headquarters in Espoo
"The
requirements for connecting to the electricity market and the electricity grid
become stricter as the Battery Energy Storage System grows larger. The
demanding integration phase has now been completed, and the Nurmijärvi Battery
Energy Storage System will be connected to all marketplaces in the electricity
and reserve markets to ensure a future-proof system. Smart multi-market
optimization delivers the best market returns to the customer," says Miia
Wallén, Head of Siemens' Flexible Services Unit in the Nordics at Siemens
Osakeyhtiö.
"The Nurmijärvi Battery
Energy Storage System contributes to maintaining the stability of the
electricity system. These are the kinds of projects we want to invest in: they
combine advanced technology, an interesting market outlook, and support for the
green transition. We will be among the first to benefit from the opportunities
of the entire electricity and reserve market, and Siemens' involvement from the
beginning has ensured that the project has the latest market understanding,
technological expertise and know-how," says Antti Jaakonsaari,
Evli's Portfolio Manager.
The industrial-grade Battery
Energy Storage System in Nurmijärvi supports the development of a flexible
energy system in Finland, as it can offer significant flexibility for balancing
the electricity grid. The Nurmijärvi Battery Energy Storage System has an
output of approximately 40 MW and an energy capacity of 81 MWh, making it one
of the largest electricity storage facilities in Finland.
A flexibly functioning
electricity market is the most cost-effective way to achieve a balance between
electricity supply and demand and thus ensure society's electricity supply. The
need for flexibility in the electricity market is increasing as fossil power
plants are replaced with renewable wind and solar energy. Flexibility can be
achieved in the energy system by connecting various sites capable of
flexibility to the electricity network, such as electricity storage facilities
suitable for quick reactions. The trading of electricity storage in the reserve
market is carried out through Siemens Osakeyhtiö's VIBECO subsidiary.
The Nurmijärvi Battery Energy Storage System is one of the first electricity storage facilities of its size to be connected to all markets with new requirements
The system technical requirements for Battery Energy Storage System to be connected to the Finnish electricity system have been staggered according to the size category from Class A to Class D. The Battery Energy Storage System in Nurmijärvi is of the D category, i.e. the largest in size.
To ensure the stability and reliability of the power system, it is important that the Battery Energy Storage System remain within the frequency and voltage ranges specified in the requirements and can withstand the voltage and frequency fluctuations occurring in the power system. Before being connected to the electricity grid and marketplaces, the Battery Energy Storage System must pass numerous tests. The Nurmijärvi Battery Energy Storage System is one of the first electricity storage facilities of its size to meet the new defined requirements and has been integrated into all marketplaces after passing the required tests.
Further information for the media:
Kirsi Rejman, Head of Communications, Siemens Osakeyhtiö, +358 50 68 407, kirsi.rejman@siemens.com
Antti Jaakonsaari, Portfolio Manager, Evli Renewable Energy Infrastructure Fund II, +358 50 521 9833, antti.jaakonsaari@evli.com
Kirsi Rejman, Head of Communications, Siemens Osakeyhtiö, +358 50 68 407, kirsi.rejman@siemens.com
Antti Jaakonsaari, Portfolio Manager, Evli Renewable Energy Infrastructure Fund II, +358 50 521 9833, antti.jaakonsaari@evli.com
Siemens in
Finland
Siemens is a leading technology company focused on industry, infrastructure, and mobility. The company’s purpose is to create technology to transform the everyday, for everyone. By combining the real and the digital worlds, Siemens empowers customers to accelerate their digital and sustainability transformations, making factories more efficient, cities more livable, and transportation more sustainable. The Siemens companies operating in Finland include Siemens Osakeyhtiö, Siemens Healthcare Oy, Siemens Energy Oy, Siemens Mobility Oy, Siemens Industry Software Oy, and Siemens Financial Services, sivuliike Suomessa (the Finnish subsidiary of Siemens Financial Services). Siemens Osakeyhtiö has regional offices in Estonia, Latvia, and Lithuania, and a subsidiary called VIBECO Oy in Finland. Siemens Osakeyhtiö’s annual turnover in Finland and the Baltic countries is about EUR 206 million, and it employes approximately 420 people. Globally in fiscal 2024 the Siemens Group generated revenue of €75.9 billion and net income of €9.0 billion. The company employes around 312,000 people worldwide. More information in Finnish: siemens.fi
Evli Plc
Evli is a Nordic wealth manager that helps institutions, companies, and individuals build a prosperous tomorrow. With 40 years of experience, we offer award-winning and result-driven wealth management, along with a broad range of investment solutions. Evli employs 300 professionals and manages EUR 20.8 billion in client assets (net as of 9/2025). Evli's B shares are listed on Nasdaq Helsinki. More information: evli.com
Siemens is a leading technology company focused on industry, infrastructure, and mobility. The company’s purpose is to create technology to transform the everyday, for everyone. By combining the real and the digital worlds, Siemens empowers customers to accelerate their digital and sustainability transformations, making factories more efficient, cities more livable, and transportation more sustainable. The Siemens companies operating in Finland include Siemens Osakeyhtiö, Siemens Healthcare Oy, Siemens Energy Oy, Siemens Mobility Oy, Siemens Industry Software Oy, and Siemens Financial Services, sivuliike Suomessa (the Finnish subsidiary of Siemens Financial Services). Siemens Osakeyhtiö has regional offices in Estonia, Latvia, and Lithuania, and a subsidiary called VIBECO Oy in Finland. Siemens Osakeyhtiö’s annual turnover in Finland and the Baltic countries is about EUR 206 million, and it employes approximately 420 people. Globally in fiscal 2024 the Siemens Group generated revenue of €75.9 billion and net income of €9.0 billion. The company employes around 312,000 people worldwide. More information in Finnish: siemens.fi
Evli Plc
Evli is a Nordic wealth manager that helps institutions, companies, and individuals build a prosperous tomorrow. With 40 years of experience, we offer award-winning and result-driven wealth management, along with a broad range of investment solutions. Evli employs 300 professionals and manages EUR 20.8 billion in client assets (net as of 9/2025). Evli's B shares are listed on Nasdaq Helsinki. More information: evli.com
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Siemens in Finland
Siemens is a leading technology company focused on industry, infrastructure, and mobility. The company’s purpose is to create technology to transform the everyday, for everyone. By combining the real and the digital worlds, Siemens empowers customers to accelerate their digital and sustainability transformations, making factories more efficient, cities more livable, and transportation more sustainable. The Siemens companies operating in Finland include Siemens Osakeyhtiö, Siemens Healthcare Oy, Siemens Energy Oy, Siemens Mobility Oy, Siemens Industry Software Oy, and Siemens Financial Services, sivuliike Suomessa (the Finnish subsidiary of Siemens Financial Services). Siemens Osakeyhtiö has regional offices in Estonia, Latvia, and Lithuania, and a subsidiary called VIBECO Oy in Finland. Siemens Osakeyhtiö’s annual turnover in Finland and the Baltic countries is about EUR 206 million, and it employes approximately 420 people. Globally in fiscal 2024 the Siemens Group generated revenue of €75.9 billion and net income of €9.0 billion. The company employes around 312,000 people worldwide. More information in Finnish: siemens.fi