Europe’s power grids are facing an unusual test on Wednesday as a solar eclipse is set to temporarily cut electricity generation from photovoltaic farms across much of the continent. Transmission system operators, including Poland’s PSE, insist they are ready to keep the system running safely throughout the event.
The challenge comes at a time when the European energy sector is already under pressure from returning heat waves and a hydrological drought that has restricted conventional power plants. The eclipse will force grids to absorb a rapid yet predictable change in the generation mix within a short window of time.
According to ENTSO-E, the European Network of Transmission System Operators for Electricity, the Moon’s passage in front of the Sun on 12 August will lower solar output in a large part of Europe. In cloudless conditions, photovoltaic production could drop by up to 9.7 GW across the continent between 19:15 and 21:30 CEST.
A forecastable but significant drop
The expected loss of nearly 10 GW in around two hours is a serious swing for power systems that increasingly depend on renewable energy. ENTSO-E says European TSOs, including Polish operator PSE, have confirmed they are prepared to guarantee secure and stable operation for the whole duration of the eclipse.
Solar energy has become a vital pillar of Europe’s power mix, generating about 13% of electricity in the European Union in 2025. Because renewables are expanding quickly, grid operators increasingly track weather and natural events that can disturb generation patterns in short timeframes.
How system operators are responding
To protect network safety, grid operators across Europe have applied a package of coordinated measures. Control room teams were briefed before the event, and market participants received advance information about the expected decline in solar production.
The biggest effects are anticipated in Spain and Germany. To help operators there make decisions in real time, local transmission companies are receiving updated PV generation forecasts from weather service providers.
Planned network maintenance has been postponed for the eclipse period to keep as much flexibility as possible. ENTSO-E has also created a special task force responsible for coordinating preparations, monitoring the course of the event and enabling information exchange between TSOs before and after the eclipse.
The ability to predict and react to short-term swings in renewable generation is becoming a central element of Europe’s energy transition, and Wednesday’s eclipse will be a live check of how well the system can handle it.
Źródło: WNP.PL, Fot. Marco Taliani de Marchio / Shutterstock
