Rare total eclipse set to block solar generation across parts of Europe

On Wednesday evening, Europe will experience a rare total solar eclipse that will block solar generation across parts of the continent. The celestial event is expected to draw thousands of tourists to northern Spain, but will also present a challenge for technicians operating the region's growing solar-powered power grids. Although the eclipse has been predicted centuries in advance, its impact on solar generation will still be noticeable.

The sun will be below the horizon when the moon obscures it, meaning alternative sources of electricity, such as natural gas, hydropower, and nuclear plants, will need to bridge the gap in power supply. The UK's grid operator has issued a warning about tight margins for Wednesday evening, requesting spare generation to meet demand.

Britain's National Energy System Operator predicts a shortfall of nearly 1.8 gigawatts starting at 5pm local time. Energy suppliers like Octopus Energy have advised customers to limit electricity use during the eclipse to avoid the need for gas-powered plants, which emit carbon emissions. The extent of the eclipse's impact varies across Europe, with Spain expected to experience a total eclipse at sunset, reducing solar output by 95%.

Acciona, a Spanish solar farm operator, is well-prepared for the eclipse and has integrated its effects into its generation forecasts. While this eclipse will have a relatively minor impact on European solar generation, another eclipse is set to occur in Europe next summer, striking in the late morning when solar output is typically highest.