Greece's Larissa gets 330 MW/790 MWh battery storage facility
A new standalone battery energy storage facility has been commissioned in Larissa, Thessaly, by METLEN and Karatzis Group. It has 330 MW of power capacity and 790 MWh of storage capacity. The partners developed it through a joint investment vehicle, with Karatzis holding 51 per cent and METLEN 49 per cent, while METLEN oversaw construction, operation and maintenance.
The Larissa installation pairs 330 MW of instantaneous power with 790 MWh of stored energy, making it a standalone grid battery rather than a generation-linked system. It was delivered via a shared investment company, with Karatzis Group controlling 51% and METLEN 49%; METLEN also handled building, running and upkeep.
The partners’ wider activity includes a July 2026 move by METLEN to take a 40% interest in a Tsakos Group special-purpose vehicle for a Greek hybrid project combining 251.9 MW of solar capacity with 375 MWh of batteries. In March 2026, METLEN and PPC Group agreed to form an equally owned venture for battery projects in Romania, Bulgaria and Italy.
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The Larissa facility could affect households, businesses and grid operators in Thessaly by helping absorb and release electricity as demand shifts. If operated effectively, it may support reliability when renewable output varies, potentially reducing some strain on transmission infrastructure. Local workers and suppliers might gain from construction and maintenance activity, while consumers could see indirect benefits if storage helps smooth supply. The scale of these effects will depend on how the battery is used and how it interacts with Greece’s wider energy system. Count: The1 Larissa2 facility3 could4 affect5 households6, businesses7 and8 grid9 operators10 in11 Thessaly12 by13 helping14 absorb15 and16 release17 electricity18 as19 demand20 shifts21. If22 operated23 effectively24, it25 may26 support27 reliability28 when29 renewable30 output31 varies32, potentially33 reducing34 some35 strain36 on37 transmission38 infrastructure39. Local40 workers41 and42 suppliers43 might44 gain45 f