On 21 June, the longest day of the year, Europe celebrates the power of the sun.

Solar accounted for 13% of the EU’s electricity in 2025, making it the bloc’s fastest-growing power source that year – expanding more than any other source. Solar cuts emissions, lowers bills, creates jobs and reshapes how we think about energy.

Here are 21 facts that show why solar energy really stands out:

Solar costs have fallen dramatically

Solar panel costs have dropped by more than 80% over the past decade, making it one of the most affordable energy sources today.

Payback takes just a few years

A solar system can pay for itself in as little as five years, depending on the installation.

Decades of low-cost electricity

Panels can last up to 30 years, meaning decades of electricity at minimal cost once installed.

Big savings for households

Solar can cut electricity bills by 30–70% or more, depending on usage and sunlight.

Works even when it’s cloudy

Solar panels need light, not heat, so they continue generating power on cloudy days.

Performs well in colder climates

Panels often operate more efficiently in cooler temperatures, helping balance lower winter sunlight.

Built to handle extreme weather

Modern solar systems are designed to withstand rain, hail, snow and strong winds, meeting strict international standards.

Solar power is already mainstream in Europe

Solar now provides around 11% of Europe’s electricity, showing how quickly it has scaled.

Solar is the cheapest energy source

After decades of steep cost decline, solar is the cheapest electricity source in history.

It could cut power prices significantly

Meeting renewable targets could reduce electricity prices by 25% and make them 20% more stable.

Supports hundreds of thousands of jobs

The sector already employs over 800,000 people in the EU, with strong growth expected.

Solar strengthens energy independence

Solar reduces reliance on imported fossil fuels and volatile prices. It is a one‑off investment that produces electricity for up to 30 years, without ongoing fuel imports.

Already cuts Europe’s energy bill

Since the start of the Middle East conflict in 2026, solar has helped the EU avoid over €15 billion in gas imports, reducing exposure to global supply shocks.

Delivers immediate climate benefits

In 2024, solar in the EU generated 304 TWh and avoided 64 MtCO₂eq emissions.

Its climate impact is growing fast

Solar has already avoided around 400 MtCO₂eq over the past decade in Europe. By 2030, solar could cut emissions by 154 MtCO₂eq per year, roughly the footprint of the Netherlands.

Solar pays back its carbon footprint quickly

Solar panels offset their manufacturing emissions within 4 to 8 months, then produce clean electricity for decades.

Solar is a highly recyclable technology

Around 90% of a solar panel’s materials can be recovered and reused.

It is very water-efficient

Solar uses about 446 litres per MWh, far less than fossil fuels or nuclear power.

Solar uses surprisingly little land

Even ambitious renewable expansion would require only about 2.2% of EU land, leaving the vast majority untouched.

Farming and solar can work together

Agrivoltaics can reduce water use by 20–30% while supporting crops and biodiversity.

Solar supports communities directly

Solar projects can reduce energy poverty, create local jobs, and even provide free electricity in community schemes.

A closing thought

The sun is a shared resource: abundant, borderless, and available to everyone. It cannot be monopolised or depleted, and it offers a unique foundation for a more open and resilient energy system. Solar power transforms this common resource into electricity that is local and accessible.

On the longest day of the year, it is worth remembering that the energy we need is already above us.

For more, explore our Solar Facts series.

European Solar Day - 21 Reasons Solar Deserves Its Own Day