Data from Greece’s electricity transmission system operator ADMIE show a sharp acceleration in solar growth on the transmission network, challenging wind power’s long-standing dominance and raising concerns over midday overgeneration, curtailments and downward pressure on market prices.
Renewable capacity on the transmission grid has reached 7,741 MW, supported by 699 MW of pumped-storage hydro. Wind accounts for 4.41 GW and solar for 3.18 GW, up from 4.1 GW and 2.6 GW at the end of 2024. Between January and April 2025 alone, solar narrowed wind’s lead by around 250 MW.
The development pipeline points even more strongly toward solar. Connection offers total 14.8 GW, of which 10.2 GW are solar and 3.16 GW wind, with the remainder in other technologies. If all projects proceed, solar capacity on the transmission network would rise to 13.35 GW—nearly hitting the 2030 National Energy and Climate Plan target of 13.5 GW years in advance—while wind would climb to about 7.5 GW.
Officials warn that without corrective measures, the imbalance could intensify operational and market challenges. Large-scale battery projects are not expected before summer 2026, so the Energy Ministry is preparing measures from September to accelerate wind development and improve the overall generation mix.
