Greece’s largest battery energy storage system and one of the largest in Europe, was inaugurated on Wednesday, October 14.2026, in Larissa. With a power output of 330 MW and a storage capacity of 790 MWh, the project was developed through a strategic partnership between METLEN and the Karatzis Group of Companies.
Prime Minister Kyriakos Mitsotakis and Minister of Environment and Energy Stavros Papastavrou, attended the inauguration ceremony.
The new facility represents energy infrastructure of strategic importance, as energy storage, electricity grids and interconnections are essential prerequisites for attracting investment and strengthening the productive base of Greece and Europe. It clearly demonstrates the importance of having projects that are sufficiently advanced, modern infrastructure, and companies with the scale and expertise required not only to invest but, above all, to deliver projects successfully.
The facility is a flagship project for the new era of energy and an important milestone in building the productive foundation on which the next phase of the Greek economy will rely. METLEN undertook the construction, operation and maintenance of the facility, drawing on its international experience in delivering complex energy storage projects.
Prime Minister Kyriakos Mitsotakis described the facility as an important step towards the Greece of the future, highlighting the investment’s contribution to the country’s energy security and competitiveness.
Among other things, he explained that the investment would enable surplus electricity generated from renewable energy sources, primarily solar and wind power, to be stored and fed into the grid whenever needed. He described the project as an example of the flexibility required to manage electricity generated from renewables, emphasizing the important role that investments in energy storage facilities played in achieving this objective.
In this context, Prime Minister Mitsotakis underlined the importance of the project inaugurated by Metlen and the Karatzis Group, explaining that this was also why the government had supported energy storage investments through the Recovery and Resilience Facility and was continuing to allocate €200 million to similar initiatives.
Regarding the green transition, he stressed that it should be viewed as a marathon rather than a sprint. He also noted that, as Greece and Europe moved towards their long-term energy transition goals, fossil fuels would continue to play a significant role in the interim period.
He therefore he argued that the country’s overall energy planning should be balanced and flexible. In this regard, he noted that Greece was also moving ahead with its first natural gas exploratory drilling operation in decades, which was scheduled to begin in the Ionian Sea in the second quarter of 2027.
Prime Minister Mitsotakis further emphasized that investment in and support for Greek industry constituted a national priority. He described these developments as a vision of Greece’s future, in which the country would demonstrate greater resilience and adaptability, enabling it to better withstand external shocks and enhance its competitiveness in international markets.
Sources: primeminister.gr, amna.gr
