During the weekend, the Polish transmission system operator PSE repeatedly limited the production of electricity from photovoltaic sources due to excess energy in the network. In some hours, solar power plants with an output of more than two gigawatts (GW) had to be shut down and electricity prices dropped below zero. This is reported by the Warsaw correspondent TASR according to the daily Rzeczpospolita.
The PSE company proceeded with reductions, especially during sunny weekend days, when electricity consumption is lower. It experienced the biggest restrictions on June 4, when it temporarily shut down photovoltaic sources with a capacity of more than 2.4 GW. Other interventions also took place during the weekend.
The reason for the measures was the excess of electricity from renewable sources compared to the current demand. Before limiting production, the operator uses the reduction of the output of conventional power plants as well as the export of electricity abroad in order to maintain the stability of the system.
The surplus of production was also reflected in the electricity market. Over the weekend, prices on the short-term market fell below zero at some intervals. The lowest value was reached on June 6 at approximately minus 100 zlotys (23.6 euros) per megawatt hour.
According to the data of the Forum Energii think tank, approximately 0.9 terawatt hours of electricity from renewable sources have been unused since the beginning of the year due to forced production restrictions. For the entire year 2025, this volume represented almost 1.4 terawatt hours.
