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Metlen and Karatzis inaugurated a 330 MW/790 MWh standalone battery storage project in Larissa, Thessaly, on October 14, 2026. The project partners describe it as Greece’s largest standalone battery, and ESS News reports that it uses Jinko ESS equipment; its grid connection caps active power injection at 330 MW.
Metlen and Karatzis Group inaugurated a 330 MW/790 MWh battery energy storage system in Larissa, Thessaly, on October 14, opening a large standalone storage facility intended to support Greece’s electricity system. The developers describe it as the country’s largest standalone battery project. ESS News reports that the system uses Jinko ESS equipment, although the partners’ public announcements did not identify the supplier.
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 its experience with energy storage projects in international markets. The inauguration took place in the presence of Prime Minister Kyriakos Mitsotakis, Environment and Energy Minister Stavros Papastavrou, and local and national officials.
The project’s stated 330 MW power rating differs from a 395 MW figure previously published by Jinko for a 790 MWh system. ESS News reports that the installed equipment is Jinko’s SunTera G2 ESS and that the discrepancy reflects the grid connection terms: the project can inject up to 330 MW of active power at the local high-voltage substation. Its 790 MWh capacity corresponds to roughly two hours at the 395 MW figure, while the connection agreement limits the maximum export power.
The project partners’ description of the plant as the country’s largest standalone storage project is a claim attributed to the developers. ESS News also reports that the design has a roughly 1.2-to-1 DC-to-AC ratio, with battery capacity and equipment power above the allowed grid export level. The report does not provide commissioning test results or operational performance figures.
Storage Adds Flexibility to Thessaly
The battery gives Greece’s power system a large facility that can store electricity and later return it to the grid, helping manage differences between periods of generation and demand. Storage can be especially relevant as renewable output varies, though the available report does not specify how this project will be dispatched or quantify its expected effect on renewable curtailment, prices, or grid reliability.
The 330 MW export limit is a key practical constraint: the facility’s energy capacity is 790 MWh, but its maximum active power injection at the connection point is capped by its agreement with the transmission system operator, ADMIE/IPTO. That limit distinguishes the amount of energy the battery can hold from the rate at which it can supply electricity to the grid.
The project also illustrates the division between development and supply: Metlen and Karatzis are the investment partners, Metlen is responsible for construction and ongoing operations, and ESS News identifies Jinko ESS as the equipment supplier. The report does not disclose the project’s cost, revenue arrangements, or the terms of the supply contract.
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Project Capacity and Grid Agreement
The Larissa facility combines an announced 790 MWh storage capacity with a 330 MW connection limit. Jinko had previously published details of a 395 MW/790 MWh system, while the project’s grid agreement sets a maximum of 330 MW of active power injection at the local high-voltage substation. These figures refer to different aspects of the installation and its grid connection, rather than necessarily indicating separate projects.
At the inauguration, Mitsotakis said energy storage would play a critical role in enabling greater use of renewable energy. He also pointed to the government’s ambition to have 3–4 GW of storage projects operating or under development by 2028. That is a stated national target, not confirmation that those projects are already built or that they will all reach operation by that date.
Metlen has other storage-related projects and agreements. In August 2026, it signed a balance-of-plant contract with UK developer Pulse Clean Energy for the 129 MW/362 MWh Penn BESS in England’s West Midlands. The source report also says Metlen agreed the previous month to sell the Tamarico II hybrid solar-and-battery project in Chile to Copec subsidiary Copec Flux. Tamarico II includes 165 MW of solar capacity and 725 MWh of storage, with potential expansion to 925 MWh.
“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, executive chairman of Metlen
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Supplier and Operating Data Gaps
The project partners’ inauguration announcements did not name Jinko ESS as the supplier. ESS News says it confirmed the system features Jinko’s SunTera G2 ESS, and notes that Jinko previously published a matching 395 MW/790 MWh specification. The source material does not include a statement from the project partners confirming the supplier or the equipment model.
It is also not clear from the available report when the battery will begin or complete commercial operation, how it will participate in electricity markets, or what charging and dispatch arrangements it will use. No project cost, financing details, expected annual throughput, efficiency figures, or measured contribution to the grid are provided. The source identifies the 330 MW grid cap but does not give further technical or commercial terms of the ADMIE/IPTO connection agreement.
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Operation Under the 330 MW Cap
The next operational milestone is the facility’s use under its 330 MW maximum injection limit. The available report does not give a date for commercial operation or detail any remaining commissioning steps, so those milestones should not be assumed from the inauguration alone.
Further information from Metlen, Karatzis, Jinko ESS, or ADMIE/IPTO could clarify the supplier arrangement, the battery’s operating schedule, and how the project will contribute to Greece’s storage target. The government’s stated aim is for 3–4 GW of storage projects to be operating or under development by 2028; the Larissa project is one development within that wider ambition, but the report does not establish how much capacity will ultimately meet the target.
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Key Questions
Where is the new battery storage project?
It is in Larissa, Thessaly, Greece, and was inaugurated on October 14, 2026.
What are the battery’s capacity and grid export limit?
The facility is reported as having 790 MWh of energy capacity and a 330 MW maximum active power injection limit under its grid connection agreement.
Who supplied the battery system?
The project partners’ public announcements did not name a supplier. ESS News reports that the facility uses Jinko ESS’s SunTera G2 system.
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 was responsible for construction, operation and maintenance.
When will the facility begin commercial operation?
The source report gives the inauguration date but does not state when commercial operation will begin or whether any commissioning steps remain.
Source: rss
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