Solar Power Costs Drop 90% as Clean Energy Soars Globally

Something remarkable is happening in the fight against climate change, and it's powered by falling prices rather than government mandates.

Solar energy costs have dropped 90% per kilowatt-hour over the past decade, transforming what was once the most expensive way to generate electricity into the cheapest option for most of the planet. The shift is so dramatic that in 2025, solar accounted for 83% of all new electricity-generating capacity worldwide.

The numbers tell a stunning story. In 1975, solar power cost $100 per watt. Today it's just 20 cents, a 99.8% decrease that makes it unprecedented among energy technologies.

Speed matters as much as price. In 2004, installing a gigawatt of solar power (equivalent to a nuclear reactor's capacity) took a full year. By 2023, that timeline had shrunk to just 24 hours, and it's still falling.

Pakistan installed enough solar in 18 months to match one-third of its entire grid capacity. China added nearly 400 gigawatts of solar and wind in 2025 alone, matching the rest of the world combined.

Battery storage costs have fallen by a similar 90% in the past decade, solving the puzzle of how to save sunshine for nighttime use. Wind power costs dropped 80% over the same period, adding fuel to the renewable revolution.

The results are reshaping global energy. Renewables now grow fast enough to exceed all new electricity demand worldwide and already produce more energy than coal. In the UK, renewables supply 37% of power needs compared to just 35% from fossil fuels.

The Ripple Effect

China, the world's largest carbon emitter and factory floor, shows how this transformation can work at scale. Despite growing electricity demand, analysts believe the country's carbon emissions are now flatlining or even declining thanks to its massive renewable buildout and industrial efficiency improvements.

If China can decouple emissions from economic growth, any nation can. The country is also leading electric vehicle adoption, with one in two new vehicles sold there running on batteries rather than gasoline.

That trend is spreading. In the UK, one in four new vehicles is electric, while petrol car registrations have dropped 25% year over year. Since power generation and transport combined account for most global carbon emissions, these shifts offer genuine hope.

The path forward isn't easy, but it's becoming visible. Markets are choosing renewables not because they're mandated but because they make economic sense, creating a self-reinforcing cycle that's finally starting to win the race against climate change.