The Hellenic Distribution Network Operator (HEDNO) has issued a mandate for owners of self-consumption photovoltaic systems exceeding 400 kW to install remote control devices by September 15. This initiative aims to enhance grid stability by allowing the operator to manage surplus renewable energy production during periods of low demand. By integrating specialized telemetering equipment, Greece seeks to avoid potential blackouts and transition toward horizontal curtailment strategies. Failure to comply with these technical upgrades within the eight-month window may result in disconnection from the national power grid.
HEDNO, also known as DEDDIE, is prioritizing the installation of “set-point” equipment to give the network operator greater oversight of solar power generation. These telemetering devices enable remote curtailment, a necessity that became essential as renewable capacity continued to expand. The primary objective is to prevent the grid from becoming overwhelmed when production outpaces consumption, a scenario that recently led to significant energy disruptions in other European regions.
Current data suggests that approximately 4,300 MW of renewable units connected to the distribution network have already implemented these upgrades. However, authorities are pushing to finalize the remaining 1,200 MW of the 5,500 MW target before the spring season. This period is critical for the Greek energy market, as it typically features peak solar output coupled with minimal domestic demand, often resulting in plummeting wholesale prices and the need for significant production cuts.
The new regulations apply broadly across various installation types, including those under net metering and virtual net metering frameworks. The requirement stands regardless of whether the system includes energy storage capabilities. In contrast to the distribution network, the transmission-level plants have already completed the necessary technical transitions.
Upon completing the installation of the remote control hardware, producers are required to submit a formal notification and technical documentation to HEDNO. The operator emphasized that these measures are designed to facilitate horizontal curtailment. This approach allows the grid to slightly reduce the output of many photovoltaic systems simultaneously rather than forcing a total shutdown of specific units, ensuring a more equitable and stable distribution of energy across the network.