A total solar eclipse will sweep across parts of Europe on Wednesday evening, with up to 95% of the sun obscured in some regions, triggering concerns over potential disruptions to power grids already strained by extreme weather.
Grid operators in Spain and the UK anticipate solar power losses of up to 5GW and 1.3GW respectively, as the eclipse reduces solar energy generation during peak demand hours. The event, the first total eclipse visible in Europe this century, will begin just after 6 p.m. local time in the UK and last for several hours, with totality observed in northern Spain, Portugal, and parts of Iceland and Greenland.
The eclipse will peak at 95% obscuration in Plymouth, UK, while London will experience a 91% eclipse. In northern and eastern Spain, the Balearic Islands, and northeastern Portugal, the moon will completely block the sun for over two minutes, creating a rare total eclipse. The next comparable event in Europe is not expected until 2081.
Energy officials warn that the sudden drop in solar power could compound existing pressures on electricity systems still recovering from this summer’s extreme weather. Heatwaves forced nuclear and coal plants offline in several countries, while low water levels disrupted hydropower operations. Grid operators in France and Spain have prepared contingency measures, including balancing supply from alternative sources to offset the solar shortfall.
Safety precautions for viewers
Astronomers emphasize the need for specialized eye protection during the eclipse. NASA and the American Academy of Ophthalmology caution that regular sunglasses are insufficient, as even brief exposure to the sun can cause permanent eye damage. Authorities recommend using eclipse glasses or handheld viewers with certified filters to safely observe the event.
Scientific opportunities
Researchers will leverage the eclipse to study the sun’s outer atmosphere, known as the corona, which is typically obscured by the sun’s brightness. NASA will deploy high-altitude jets and scientific balloons to observe atmospheric changes during the eclipse’s darkness. The event also marks the first total eclipse visible from mainland Spain since 1905, according to the European Space Agency.
Cultural and regional impacts
In regions experiencing totality, such as Ibiza and León, Spain, local communities are preparing for an influx of visitors. Nightclubs in Ibiza have announced plans for "the party to top all parties" coinciding with the eclipse, while authorities in León anticipate increased tourism and public gatherings. The eclipse’s timing, occurring in the early evening, may limit its visibility in some areas due to daylight conditions.
Grid operators and astronomers stress that while the eclipse presents challenges and opportunities, proper planning and safety measures can mitigate risks. The event serves as a reminder of the interconnectedness of energy systems and celestial phenomena, with implications for both infrastructure resilience and scientific discovery.