COLORADO SCHOOL OF MINES: NEW DAYS AWARD. CONTROL NUMBER: 1906-1508 TITLE: ''ECONOMIC LONG-DURATION ELECTRICITY STORAGE BY USING LOW-COST THERMAL ENERGY STORAGE AND HIGH-EFFICIENCY POWER CYCLE'' DEVELOP A TRANSFORMATIVE LDES SYSTEM COMPRISED OF HIGH-TEMPERATURE, LOW-COST PARTICLE THERMAL ENERGY STORAGE SYSTEM COUPLED WITH AN ADVANCED PRESSURIZED-FLUIDIZED-BED HEAT EXCHANGER (PFB-HX) THAT SUPPORTS A HIGH-EFFICIENCY, CLOSED-BRAYTON COMBINED POWER CYCLE.