Renewables
Metlen and Tsakos begin hybrid renewable project in Greece
Construction has commenced on a major hybrid renewable energy facility in Domokos, combining solar power with extensive energy storage.
Key points
- The project features a 251.9MW photovoltaic plant paired with a 375MWh energy storage system.
- Tsakos Group holds a 60% stake in the joint venture, while Metlen owns the remaining 40%.
- Metlen is handling the construction and ongoing commercial management of the facility.
What happened
According to Power Technology, METLEN and Tsakos Group have officially started construction on a hybrid renewable energy project in Domokos, Greece. The development combines a 251.9MW photovoltaic power plant with an energy storage system designed to deliver a capacity of 375MWh. A groundbreaking ceremony marked the beginning of work, drawing representatives from the Hellenic Parliament, local authorities, and business organisations.
The initiative is structured through a jointly owned special purpose vehicle. Tsakos Group maintains a 60% interest in the venture, while METLEN holds a 40% share. METLEN has been tasked with overseeing both the construction phase and the long-term energy and commercial management of the new facility.
Executives from both organisations emphasised the strategic importance of the venture. Tsakos Group founder Panagiotis Tsakos noted that the installation harnesses the natural potential of Greek land while addressing technological progress and energy security. METLEN executive chairman Evangelos Mytilineos described the project as a significant investment for the country's evolving energy system, noting that it builds upon METLEN's prior collaboration in the region, which included a standalone battery energy storage system in Larissa alongside the Karatzis Group of Companies.
Why it matters
Power Technology reported that the Domokos hybrid facility aims to strengthen Central Greece's energy landscape by integrating intermittent solar generation with large-scale storage capabilities. For international energy investors and policymakers, hybrid projects represent a critical evolution in managing grid stability as the penetration of renewable sources increases.
According to World Bank figures, Greece achieved 100% access to electricity and clean cooking by 2024, with a renewable share of electricity output standing at 40.6% in 2021, comfortably exceeding the global average of 27.8% reported for that year. As European nations seek to optimise their domestic generation capacity, the integration of utility-scale storage systems alongside photovoltaic plants offers a replicable model for smoothing out supply fluctuations and enhancing energy security across developing and developed markets alike.
Original reporting
This article draws on the following reports. Read them in full on the publishers’ sites.
Context from CEII
Renewables are the fastest-growing part of the world’s energy system. The COP28 goal is to triple capacity by 2030, and solar mini-grids are the fastest route to power for millions of people without electricity.
40.6% of electricity in Greece was renewable in 2021Countries in this story
Written by the CEII Desk, the Centre’s automated newsroom, from the reporting credited above and CEII’s own data. Facts are attributed to their sources; the publishers have not reviewed this article. Spotted an error? Tell our editors.
