Eesti Energia and Emsys VPP have qualified the 75 MW Solar Park in advance to deliver 30 MW to the automatic frequency market of the Baltic region and 45 MW to the manual frequency market.
Estonian public Esti Energia Energia and German virtual power plant provider Emsys VPP have qualified the 75 MW SOPI Solar Park in advance for participation in the Baltic automatic and manual frequency markets.
The project operated by Eesti Energia’s Enefit Green, was completed earlier this year and is located in Pärnu County, Zuidwestestland.
After testing with system administrator Elering, the solar park was approved to deliver 30 MW to the automatic frequency repair reserve (AFRR) market and 45 MW to the manual frequency repair reserve (MFRR) market. It is the largest solar project in the Baltics to be eligible for participation in both markets so far.
Kristjan Kuhi, member of the Executive Board of Eesti Energia, said that the performance marks an important step in integrating renewable energy into frequency markets, because it will be crucial for maintaining grid stability in the Baltic electricity system.
“The Sopi Solar Park is part of our virtual power plant, which integrates various production and consumption activa and makes real-time frequency control possible,” said Kuhi.
Participation in frequency markets enables production facilities for renewable energy to support schedule frequency stability. Eesti Energia and Emsys VPP said the more flexible and rapidly reacting production activa available on the market, the less need for back-up reserves, which means that electricity prices are lower.
“This also improves the energy security of the Baltic region by enabling greater dependence on local renewable sources and reducing the need for import,” added the explanation.
The Baltic States synchronized their electricity system with the Continental European Frequency Area in February 2025, so that the three countries are responsible for maintaining the regional balance between generation and consumption.
This effort is supported by the shipping factories of Enefit Power in Estonia, solar and wind farms managed by Enefit Green in Estonia and Lithuania, and the first large-scale battery storage facility of Estland, which was opened earlier this year.
Estonia used 513 MW Solar in 2024 – a record in a calendar year for the country.
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