For more than a century, coal defined the electrical age. It lit factories and bedrooms, lifted economies, and filled the atmosphere with the carbon pollution whose consequences will outlast the power stations themselves. Now a remarkable reversal is close: the world may generate more electricity from renewable sources than from coal this year.

This is not a victory announced by an advocacy campaign. The International Energy Agency reports that renewable electricity generation virtually matched coal generation in 2025. Its mid-year forecast projects renewables moving ahead in 2026, driven primarily by solar and wind. The IEA also reports that the combined increase from renewables and nuclear power exceeded the entire growth in global electricity demand in 2025.

The distinction matters. An energy technology can grow rapidly while fossil-fuel generation grows alongside it. Replacing the marginal demand for coal is a different kind of progress: one with the potential to limit future emissions. Still, coal remained the single largest individual source of electricity in 2025. An annual global crossover is not the end of fossil-fuel dependence, nor evidence that the Paris climate goals have been secured.

The remaining obstacles are physical and political. Transmission lines must be built. Storage and flexible demand must expand. Fast-growing economies need affordable, reliable power at every hour of the day. But there is something unprecedented in the numbers: the argument is no longer about whether renewable energy can work at planetary scale. It already does. The question is how quickly humanity chooses to complete the change.