THE PROJECT OBJECTIVE IS TO RETIRE MULTIPHASE TURBINE DESIGN RISKS THROUGH AN UNDERSTANDING OF MULTIPHASE TURBINE OPERATION, ENABLING IMPROVED TURBINE PERFORMANCE (FIVE POINTS EFFICIENCY) AND OPERABILITY RANGE (MULTIPHASE TURBINE EXIT CONDITIONS). OVER THREE BUDGET PERIODS (BP), THE PROJECT TEAM WILL DESIGN AN ADVANCED MULTIPHASE-TOLERANT SCO2 TURBINE (BP1), PROCURE, ASSEMBLE, AND COMMISSION THE TURBINE AND TEST FACILITY (BP2), AND VALIDATE ITS PERFORMANCE, RELIABILITY, AND OPERATING ENVELOPE THROUGH A DEMONSTRATION TEST (BP3). IN THIS WAY, IMPROVEMENTS AT THE COMPONENT LEVEL WILL ADVANCE THE PERFORMANCE AND OPERABILITY OF PUMPED THERMAL ENERGY STORAGE (PTES) SYSTEMS.