The assessment analyzed 71,398 river segments across the 48 contiguous states and additional river segments in Alaska. It yielded a total theoretical resource estimate of 1,381 terawatt-hours per year (TWh/yr) for the continental United States, which is equivalent to approximately 25% of annual U.S. electricity consumption. Because there are constraints on developing many sites, the study found that the technically recoverable resource estimate for the continental United States is 120 TWh/yr, or approximately 3% of annual U.S. electricity consumption.
The results show that the Lower Mississippi region constitutes almost half (47.9%) of the technically recoverable resource estimate; Alaska, 17.1%; the Pacific Northwest region, 9.2%; and the Ohio region, 5.7%. See the EPRI press release.
This article was originally published on the U.S. Energy Efficiency & Renewable Energy (EERE) website (image added).