Sandia National Laboratories successfully completed testing of its advanced wave energy converter (WEC) system for its customer, the U.S. Department of Energy (DOE) Wind and Water Power Technology Office. In partnership with the U.S. Navy, Sandia conducted the tests at the maneuvering and sea-keeping (MASK) basin at the Naval Surface Warfare Center’s Carderock Division (NSWCCD) in Bethesda, MD. The WEC tested (1/17 scale) is among the largest scale models ever tested in a wave tank. The test program focused on model validation and system identification, producing high-quality data for control design of WECs. While the Carderock facility typically tests the effects of wave motion on Navy vessels, WEC tests provided an opportunity for Sandia, DOE, and the U.S. Department of Defense to collaborate on advanced wave energy testing.