Hydropower was long the country’s leading source of renewable energy, but it was passed in 2019 by wind and in 2025 by utility-scale solar. It’s still significant, though, with 5.6 percent of U.S.

Demand for power is growing fast, but hydro plants, the oldest source of clean energy, are struggling because of droughts, floods and other extreme weather linked to climate change. Drought and age ...

In late November, in a quiet corner of Devon, England, workers began adding a secret, light brown powder to water as they mixed up a special fluid that can store energy. They blended it with the ...

Serge Abergel, the chief operating officer at Hydro‑Québec, said that the utility was legally obligated to deliver enough energy for roughly one million homes throughout the year. The contract allows ...