The Center for Ocean Renewable Energy (CORE) at the University of New Hampshire (UNH) operates a sheltered, intermediate scale (“nursery”) tidal energy test site suited for Marine Hydrokinetic (MHK) turbines up to 4 m (13 ft) in diameter at General Sullivan Bridge in Great Bay Estuary, NH. The UNH-CORE Tidal Energy Test Site is located in a constricted area, and has the fastest tidal current velocities in the estuary with maximum currents at over 5 knots (2.6 m/s), and typically greater than 4 knots (2.1 m/s). The test site has a nominal depth of 10 m, a flat bottom, easy access from two local UNH marine facilities and nearby marinas, and hence it is a cost-effective site for the testing of tidal energy conversion devices. An 11 m x 3 m test platform has been used for MHK turbines up to 1.5 m diameter since 2008, and a larger 20 m x 10 m test platform with a modular turbine deployment system was designed to accommodate larger turbines up to 4 m in diameter. A 4 m diameter axial turbine corresponds approximately to a 1:5 scale model of a utility-scale MHK turbine rated at 1 MWel (based on a full-scale diameter of 20 m, a tidal energy resource of 2.5 m/s and a water-to-wire conversion efficiency of 0.4). A number of MHK turbines have been deployed and evaluated at this test site, including cross-flow turbines with helical blades (Gorlov Helical Turbines), and more recently, an axial Mixer-Ejector Hydrokinetic Turbine designed by FloDesign Inc. under a US Department of Energy (DoE) SBIR phase 2 project. The UNH-CORE Tidal Energy Test Site is well suited to support open-water MHK testing through DoE Technology Readiness Levels (TRLs) 5-6 and 7 (not including grid connection).