Net energy: Results for small-scale hydroelectric power and summary of existing analyses

The net energy ratios of most small-scale (≤ 25 MWe) hydroelectric demonstration projects are in the range of 10 to 12:1. This ratio compares quite favorably with ratios for thirteen other electric technologies. Of the eight nonelectric technologies summarized, natural gas systems yield the most net energy and systems producing alcohol from crops yield the least.