Solar thermal technologies are categorized as low-temperature, medium-temperature, or high-temperature. High-temperature solar thermal (HTST), also known as concentrating solar thermal (CST), is used for electrical power generation. The operating temperature reached using this concentration technique is above 500 degrees Celsius —this amount of energy heat transfer fluid to produce steam. This report looks at high-temperature solar thermal (HTST) technology, with the four main designs being considered: parabolic dish, parabolic trough, power tower, and linear Fresnel. HTST. The National Laboratory of the Rockies is a national laboratory of the U. NLR/TP-5700-97216 February 2026 This report is available at no cost from the National. Solar arrays for space are not subject to these effects, but instead have a different set of environmental hazards, including more extreme temperature cycles, particulate and ultraviolet radiation in space, micromete-oroid damage, and exposure to a flux of atomic oxygen in low-Earth orbit.