On Tuesday, the US Energy Information Administration released full-year data on how the country generated electricity in 2025. It’s a bit of a good news/bad news situation. The bad news is that overall demand rose appreciably, and a fair chunk of that was met by additional coal use. On the good side, solar continued its run of astonishing growth, generating 35 percent more power than a year earlier and surpassing hydroelectric power for the first time.

Shifting markets

Overall, electrical consumption in the US rose by 2.8 percent, or about 121 terawatt-hours. Consumption had been largely flat for several decades, with efficiency and the decline of industry offsetting the effects of population and economic growth. There were plenty of year-to-year changes, however, driven by factors ranging from heating and cooling demand to a global pandemic. Given that history, the growth in demand in 2025 is a bit concerning, but it’s not yet a clear signal that the factors that will inevitably drive growth have kicked in.

(These factors include things like the switch to heat pumps, the electrification of transportation, and the growth in data centers. While the first two of those involve a more efficient use of energy overall, they involve electricity replacing direct use of fossil fuels, and so will increase demand on the grid.)

The story of the year is how that demand was met. If demand grows more slowly, the additional 85 terawatt-hours generated by expanded utility-scale and small solar installations would have easily met it. As it was, the growth of utility-scale solar was only sufficient to cover about two-thirds of the rising demand (or 73 percent if you include wind power). With no new nuclear plants on the horizon, the alternative was to meet it with fossil fuels.