Blocked passages for fish and turbine-induced mortality of downstream migrating fish are major environmental issues for hydropower projects.rnDirect spillage is one method to protect downstream fish passage but can result in generation loss. Various turbine fish bypass technologies have been developed but generally have been expensive and their effectiveness less than optimal.rnA new turbine design that reduces fish passage injury and mortality could change everything. Developed under the U.S. Department of Energy's (DOE) Advanced Hydro Turbine Systems (AHTS) program by Alden Research Laboratory, results from pilot-scale testing done in 2001 and 2002 were promising.
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