Greece connected around 2.7 GW of new wind power and solar capacity in the first ten months of 2026, bringing its renewable portfolio to roughly 19 GW. About 2.1 GW of the additions were solar and 600 MW were wind. Solar now accounts for about 12 GW of installed renewable capacity, while a further 500 MW of renewable projects could enter operation before year-end.
The rapid expansion is increasing pressure on the electricity system when photovoltaic output is high, as generation can exceed both demand and available export capacity. Transmission operator ADMIE said renewable aggregators are curtailing nearly 75% of surplus generation that has not been sold on the day-ahead market. This occurs during particularly strong solar periods.
Storage and grid flexibility
ADMIE said the connection of around 800 MW of storage had helped reduce renewable curtailment by shifting some surplus production to later hours. Around 10 GW of Greece’s renewable fleet is connected directly to the transmission system, with the remaining 9 GW connected through distribution networks. Further solar additions will increasingly depend on storage, grid capacity and flexible demand, rather than generation capacity alone.
