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The heliostat design, installation, and operating experiences and the test and evaluation program are reported for the Solar Thermal Central Receiver Pilot Plant at Barstow, California. Operating and maintenance experiences and preliminary test results are reported from November 1981 through February 1983. Installation of the 1818 heliostats was made over a 10-month period with no major problems. Initial checkout of the heliostats was completed in nine days which included making minor software changes. Performance of the control system, including safe control of reflected light, and the heliostat structure and drives has been verified during the first year of operation. Heliostat-maintenance requirements have been less than anticipated and can be accomplished with 160 manhours per month. Problems with evaluation instrumentation and mirror corrosion have occurred and they have been solved or are being evaluated. (ERA citation 08:035516)