Renewables dominate 2025's newly installed generating capacity

And solar power accounted for about three quarters of the renewables. On Wednesday, the International Renewable Energy Agency (IRENA) released its numbers on what was built in 2025. And much as we saw in the US, solar power is the primary driver of change. The numbers show that the world installed an average of 1.4 gigawatts of solar capacity every day last year, for a total of 511 GW. That brings the total solar capacity up to 2.4 Terawatts, making it the largest single source of renewable capacity by far, at more than a Terawatt above either wind or hydro. Obviously, the actual power generated will be less than the rated capacity. And because solar panels have become so cheap, the economics now favor installing panels in areas that get far less sunlight—places in which photovoltaics would have been a questionable decision just five years earlier. So we’re likely to see the energy produced for each unit of capacity (termed the capacity factor) decline over the coming years. How much of a factor is that? 2025’s power-generation numbers are not yet available, but data from 2024 shows photovoltaics generating 7 percent of the world’s power, with wind at 8 percent and nuclear at 9. Th