According to the latest data from the U.S. Energy Information Administration (EIA), driven by persistent drought in the Colorado River basin, hydroelectric generation in the Southwestern U.S. power supply region dropped 19% year-over-year from April to August 2026, coming in 28% below the 10-year average and hitting a record low for summer generation. The region covers Arizona, New Mexico, and small parts of Nevada and California. In its November Short-Term Energy Outlook, the EIA projected that hydroelectric generation in the region for full-year 2026 will reach 6.13 billion kilowatt-hours, a 9% year-over-year decline, accounting for about 4% of the region's power generation mix. The aforementioned full-year figures are projections rather than finalized annual statistics, nor do they represent the nationwide decline in U.S. hydroelectric generation.