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A calorimetric solar receiver is described for measuring incident and absorbed solar radiation reflected from the heliostat field at the Department of Energy's 5-MW Solar Thermal Test Facility, Sandia Laboratories , Albuquerque, New Mexico. The receiver consists of nine 1-meter (3.28-ft) square panels in a 3-meter (9.84-ft) square array. Each panel is capable of absorbing 0.5 MW of power, but the total array is limited to 1 MW. Each panel is cooled by an ethylene glycol/water solution entering at 61 C (142 F) in a flow circuit parallel to the other panels. Each panel is instrumented with a turbine flowmeter, inlet and outlet coolant thermocouples, and nine heat flux gages with integral thermocouples an one third-meter grid spacings. Details of mechanical, electrical power, instrumentation, data acquisition, and structural designs are presented. Results from initial tests of concentrating up to 1 MW of thermal power on the receiver are presented.