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Metlen and Karatzis inaugurated a 330 MW / 790 MWh standalone battery storage project in Larissa, Greece, on October 14, 2026. The facility uses Jinko ESS equipment, according to Energy Storage, and its grid connection limits active power injection to 330 MW despite a higher reported equipment rating.
Metlen and Karatzis Group inaugurated a 330 MW / 790 MWh battery energy storage system in Larissa, Thessaly, on October 14, opening a major standalone storage project designed to support Greece’s power system. The partners describe it as the country’s largest standalone battery project; Energy Storage reported that the facility uses Jinko ESS SunTera G2 equipment.
The project was developed through a joint investment vehicle in which Karatzis Group holds 51% and Metlen holds 49%. Metlen said it was responsible for the facility’s construction, operation and maintenance, drawing on experience from storage projects in other markets. Greek Prime Minister Kyriakos Mitsotakis, Environment and Energy Minister Stavros Papastavrou, and local and national officials attended the inauguration.
The project’s stated power and energy ratings are 330 MW and 790 MWh, respectively, representing roughly two hours of storage at the 395 MW equipment rating cited in Jinko’s earlier published figure. Energy Storage reported that the project features Jinko ESS’s SunTera G2 system, although the companies’ inauguration announcements did not identify Jinko as the supplier.
The difference between the reported 395 MW system rating and the project’s 330 MW rating is tied to its grid connection. The connection agreement with Greece’s transmission system operator, ADMIE/IPTO, caps maximum active power injection at 330 MW at the Larissa high-voltage substation. The reported additional capacity creates an approximate 1.2-to-1 DC-to-AC ratio, rather than raising the permitted injection limit.
Storage for Greece’s Renewable Power
The facility adds large-scale battery capacity to Greece’s electricity system. Batteries can store electricity and discharge it later, helping match supply with demand and making it easier to use variable renewable generation. The project’s 790 MWh energy capacity is the amount it can store, while its 330 MW grid limit sets the maximum active power it may inject at its connection point.
Those ratings matter as Greece expands storage alongside renewable energy. Mitsotakis said at the inauguration that storage would play a critical role in enabling greater use of renewables. The government’s stated ambition is to have 3–4 GW of storage projects operating or under development by 2028. That is a target covering projects at different stages, not a claim that all of the capacity is already operating.
The project also shows how equipment capacity and grid permission can differ. Its reported 395 MW equipment rating does not override the 330 MW injection cap in the connection agreement. The facility’s contribution to the grid will depend on its operating arrangements and connection limits, details not provided in the report.
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Project Ownership and Grid Connection
The Larissa project is a standalone battery facility, rather than a battery paired at the same site with a solar or wind plant. Metlen and Karatzis developed it through a shared investment vehicle, with Karatzis holding the majority stake. Metlen’s stated role spans construction, operation and maintenance.
The connection agreement with ADMIE/IPTO sets a maximum of 330 MW of active power injection at the local high-voltage substation. Jinko previously published a 395 MW / 790 MWh system supply figure; Energy Storage said that figure matches the facility’s reported energy capacity and explains the difference between the equipment rating and the grid-connected power rating. The report identifies the system as Jinko ESS’s SunTera G2 product.
Metlen has also been involved in other storage developments. In August 2026, it signed a balance-of-plant contract for the 129 MW / 362 MWh Penn battery project in England. Separately, it agreed to sell the Tamarico II hybrid solar and battery project in Chile, which comprises 165 MW of solar and 725 MWh of storage, with potential expansion to 925 MWh. Those projects provide company context but are separate from the newly inaugurated Greek facility.
““I am particularly proud that today, here in Thessaly, we are inaugurating Greece’s largest standalone energy storage facility in Eastern Europe and one of the largest across the European Union.””
— Evangelos Mytilineos, Metlen executive chairman
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Supplier and Operating Details
The inauguration announcements did not name Jinko ESS as the supplier. Energy Storage said it had confirmation that the site uses the SunTera G2 system, and Jinko previously published a 395 MW / 790 MWh supply figure that matches the project’s reported capacity. The source material does not include a direct supplier statement tied to the inauguration.
The available information does not specify the project’s commercial operation date, charging and dispatch arrangements, expected annual output, revenue model, or storage duration under its normal operating conditions. It also does not detail how the facility will participate in electricity markets or provide grid services. The reported project ratings and connection cap do not, by themselves, establish how much electricity will be delivered over time.
The partners’ description of the facility as Greece’s largest standalone battery project is attributed to them; no independent comparison of all Greek projects is provided in the source report. Details on project cost, financing and any future expansion were also not included.
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Operations and National Storage Targets
The next development to watch is the facility’s operating status and how it uses its 330 MW grid connection. The source report confirms the inauguration but does not give a commercial operation date or provide information on dispatch, market participation or measured performance. Any operating data or company disclosures would help clarify the battery’s role in the Greek power system.
At the national level, the government’s stated goal is 3–4 GW of storage projects operating or under development by 2028. Progress toward that target will depend on projects beyond Larissa, including developments that are still being built or planned. The inauguration marks the opening of one large facility, but it does not establish how much of the national target is currently operational.
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Key Questions
Where is the battery storage project?
It is in Larissa, Thessaly, Greece, and was inaugurated on October 14, 2026.
How large is the facility?
The project is reported as 330 MW / 790 MWh. Its grid agreement caps maximum active power injection at 330 MW.
Who owns and operates the project?
The project was developed through a joint investment vehicle with Karatzis Group holding 51% and Metlen holding 49%. Metlen said it handled construction, operation and maintenance.
Did Jinko ESS supply the battery?
Energy Storage reported that the project uses Jinko ESS SunTera G2 equipment and cited a matching Jinko-published supply figure. The inauguration announcements themselves did not name Jinko as supplier.
Why is the reported equipment rating higher than the grid limit?
The reported equipment rating is 395 MW, while the grid connection agreement limits active power injection to 330 MW at the Larissa substation. The source report says the additional equipment capacity produces an approximate 1.2-to-1 DC-to-AC ratio.
Source: rss
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