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The purpose of this technical and economic feasibility assessment is to identify and analyze opportunities for new small hydropower development in the Deschutes River Basin, Oregon, along with the technology needed to develop selected sites and the economic cost/benefit of developing those sites. The three most likely scenarios for additional hydropower generation in the Deschutes Basin are: (1) add new generators at existing non-powered dams (NPDs) and diversion structures; (2) add new generators in existing irrigation canals and conduits; and (3) increase generation at existing hydropower facilities. Because this assessment focuses on developing new hydropower projects, it includes only the first two of the three scenarios: adding new generators at (1) existing NPDs and diversion structures and (2) existing irrigation canals and conduits. This assessment was conducted using the Hydropower Energy and Economic Assessment (HEEA) Tool being developed by Oak Ridge National Laboratory (ORNL). The ORNL-HEEA Tool uses site-specific hydrological data and basic site and project information to: (1) generate flow and power duration curves; (2) determine turbine design flow, net head, and technology type; (3) calculate monthly and annual power generation and determine design power capacity; (4) estimate project cost [both installation cost and levelized cost of energy (LCOE)]; and (5) perform benefits and economic evaluations. The Tool incorporates some significant improvements compared with other exiting tools, xii and provides consistent and effective predictions of energy output and economic feasibility for potential sites. The ORNL-HEEA Tool can be implemented as an independent software package to study the feasibility of individual small hydropower projects, or incorporated into the Basin-Scale Water Management Model being developed by Pacific Northwest National Laboratory (PNNL) to model varying water management scenarios to maximize hydropower generation while meeting environmental flow requirements and the needs of other water users. This assessment used the ORNL-HEEA Tool to assess the technical and economic feasibility of 14 NPDs and 15 irrigation canal/conduit sites in the Deschutes Basin for which the necessary site information and flow data were available. The total potential generation capacity for these 29 sites would be approximately 27 megawatts (MW). Given the estimated lifecycle benefits and costs of each project, only four of the NPD sites and four of the canal sites appear to be economically feasible. The eight feasible projects could add about 19 MW of hydroelectric capacity to the Deschutes Basin and could generate over 78 gigawatt hours (GWh) of renewable energy each year. This could power about 6,000 households year-round and avoid greenhouse gas (GHG) emissions of about 29,000 tone of CO2 equivalent each year.