Greece's Renewable Energy Curtailment Reached 601 GWh During The Summer

 

Greece's renewable energy curtailment reached 601 GWh during the summer, with PV revenue expected to decline by 10-15%.

 

The summer exemption for renewable energy curtailment has ended in Greece. Specifically, according to estimated energy surplus data from the Hellenic Energy, Water, and Waste Regulatory Authority (HEWEW) tool, approximately 601 GWh of green power was curtailed from June 1 to August 27, excluding weekends. Cumulative curtailment has reached 1,571 GWh, a significant increase from the pre-summer level of 970 GWh.

 

Greece's independent electricity transmission operator, ADMHE, and the renewable energy aggregator FoSE implemented curtailments to ensure system stability. This was primarily due to the continued growth of PV capacity, which resulted in excess demand during typical summer midday periods. Furthermore, curtailments were extended to Saturdays and Sundays during periods of high wind generation, with curtailments occurring on at least 20 days in June. Curtailments are projected to reach 2 TWh by 2025, despite reduced sunshine and lower PV production starting in September.

 

Industry analysts estimate that PV generator revenues will decrease by at least 10-15%, with projects with SEDY contracts facing exacerbated revenue losses. From 2026 onwards, most curtailments will be handled through market terms, with FoSE managing its delegated portfolio remotely. ADMHE will only be required to implement curtailments for redispatch purposes, which are expected to be no more than 10-20% of system-excluded production. Battery energy storage solutions are expected to begin operations in the second half of 2027, providing a buffer against revenue losses and gradually offsetting them starting in early 2028.