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Between January and September, the two clean-energy sources grew fast enough to more than offset all new demand worldwide, according to data from energy research firm Ember.

Power demand rose by 603 terawatt-hours compared to that same time period last year. Solar met nearly all that new demand on its own, increasing by 498 TWh. Wind generation, meanwhile, climbed by 137 TWh.

What happens when clean energy not only meets but exceeds new power demand? We start to burn less fossil fuels. At least a little less: Through Q3, fossil-fuel generation dropped by 17 TWh, compared to the first three quarters of 2024. This trend is expected to continue through the end of the year. Ember forecasts that fossil-fuel generation will have experienced no notable growth in 2025 — something that hasn’t happened since the height of the Covid-19 pandemic.

It’s unclear whether this flatlining marks the beginning of the end for fossil-fueled electricity or whether it’s just a pause before another surge in dirty power. The answer will more or less be determined by what grows faster: electricity demand or renewable energy.

Common consensus is that the world’s appetite for electricity will expand rapidly in the coming years. The planet is warming and driving increased use of air conditioning. AI developers are building massive power-hungry data centers. Cars, homes, and factories are being electrified. That all adds up: The International Energy Agency expects power demand to rise by a staggering 40% over the next decade.

Meanwhile, it’s almost not worth considering long-term forecasts about the growth of clean energy, given how inaccurate they’ve been in the past. Analysts have consistently underestimated solar, in particular.

For the global power sector to truly decarbonize, carbon-free energy needs to not only keep pace with electricity demand but far outrun it. Let’s hope solar continues to overperform.