On the day, the electricity supply should not vary to any great extent as a result of the eclipse. Although photovoltaic production is expected to drop temporarily while the Sun is obscured, Red Eléctrica already takes this type of scenario into account in its planning. In fact, our closest reference, the 2015 eclipse in Europe, was managed without any major incidents.
 

Understanding the eclipse and when Spain will go dark: a quick city-by-city snapshot

A total solar eclipse is an astronomical phenomenon that occurs when the Moon completely blocks the Sun as seen from Earth.

The solar eclipse in Spain will take place on 12 August at sunset, between approximately 19:30 and 21:30. However, the peak of the event will last only a few seconds. Because of this, the Government has set up a website where you can find information city by city: In the table below, we detail some of the approximate times for the main cities:

In cities like Madrid and Barcelona, we will be able to see an almost complete partial eclipse (between 80% and 90%), but it will not get totally dark.

How much solar power does Spain generate during an August evening?

Because of its geographical location and abundant sunshine, Spain is one of Europe's leading solar power producers. According to data from Red Eléctrica, August 2025 was one of the best months of the year for solar energy production, second only to June and July, with a total of 5,822 GWh, accounting for 24.8% of the electricity mix.

On a typical August evening, when the sun is already low in the sky, photovoltaic generation can still be significant, but it drops rapidly to zero in a short period of time, especially after sunset.

Because of this, the total solar eclipse on 12 August will have a limited effect on the electricity system, as it will occur when photovoltaic production is already in decline. Its impact will therefore be less than that of an eclipse occurring in the middle of the day.

What happened to the grid during the 2015 eclipse in Europe: the precedent that explains it all

This won't be the first time an astronomical phenomenon like this has put our electricity grid to the test. On 20 March 2015, a partial eclipse darkened the skies over much of Europe, including the Iberian Peninsula, between 09:00 and 12:00.

During that time, photovoltaic generation across the continent fell by around 35,000 MW, a volume equivalent to dozens of conventional power stations. This incident required an immediate, coordinated response to maintain the balance between supply and demand in a highly interconnected electricity system.

European transmission system operators (TSOs), coordinated through ENTSO-E, successfully managed the event thanks to prior planning and cross-border cooperation. This episode is therefore seen as a clear example of the European electricity system’s ability to cope with sharp variations in renewable generation.

How Red Eléctrica manages this drop in production: the hidden planning behind the scenes

Red Eléctrica acts as the “control tower,” ensuring a constant balance between generation and consumption. It can predict a potential fall in production using a series of mathematical algorithms that forecast demand based on weather, economic, and labour-related variables.

International interconnections are also crucial. By being connected to networks such as those in France and Portugal, if a generator fails unexpectedly, our European neighbours can supply energy to make up for the loss, preventing users from noticing any disruption.

In addition, the Electricity Control Centre (Cecoel) monitors the system 24 hours a day, in real time. Red Eléctrica can also ask large industrial consumers to reduce their consumption to quickly stabilise the grid in critical situations.

Thanks to all these processes, electricity reaches our homes safely and continuously – eclipse or no eclipse.

So, will it affect your supply at home? The short answer

In summary, the solar eclipse should not affect your home electricity supply. Whether you are in the path of totality or outside it, you should not notice any change in your power.

If you have solar panels at home: what will happen that day

If you use solar panels, it is normal to wonder what will happen to your self-consumption on 12 August 2026:

• 19:30–20:00: production will gradually decrease. If you have a monitoring app open at that time, you will see the curve start to fall.
• 20:27–20:33: if you are in the band of totality, production will drop to almost zero watts for the duration of the eclipse.
• 20:34–21:30: generation will gradually recover until the sun finally sets.

If your system includes storage, you can fully charge the battery during the morning of 12 August. That way, if you have a solar battery, the eclipse will not affect your supply at all, as your home will be able to use your own stored energy during those minutes of darkness.

FAQ

Will the power go out during the eclipse on 12 August?

No. The drop in solar production caused by the August eclipse has been planned for months in advance, and Red Eléctrica has mechanisms in place to balance generation.

What time is the maximum of the eclipse in Madrid and Barcelona?

Madrid and Barcelona lie outside the band of totality, although they will see a partial eclipse of between 80% and 90%. The maximum point of the eclipse will occur between 20:27 and 20:33, but there will be no total darkness in these cities.

What will happen to my solar panels on the day of the eclipse?

During the eclipse, generation may fall to zero in the band of totality for one or two minutes. If you have a battery and charge it in the morning, you will not notice any impact. If you do not have a battery, your consumption will be covered by the grid during that period, just as it is on any other evening.

Will electricity prices rise that day because of the eclipse?

If you are on a fixed-rate tariff, the eclipse will not affect your bill. If not, it will depend on the specific characteristics of your tariff.

From which cities will the total eclipse be visible?

The band of totality will pass over cities such as La Coruña, Oviedo, León, Burgos, Bilbao, Logroño, Soria, Zaragoza, Castellón de la Plana, Valencia and Palma.