Updated

Hydropower generation in the Southwest electricity supply region fell to a record low this summer, the Energy Information Administration reported on November 13, 2026. The region covers Arizona, New Mexico, and small parts of Nevada and California. The EIA said prolonged drought in the Colorado River Basin drove the decline. Hydropower generation from April through August 2026 was 19% lower than in the same period last year and 28% lower than the 10-year average, according to its Form EIA-923 survey data.