Abstract: The central receiver system (CRS), which comprises of a heliostat field, receiver, and power production unit, is one form of concentrated solar power (CSP) technology. Heliostats are simply mirrors that concentrate sun energy at a single spot on a receiver at the top of a tall tower. Starting with the first heliostat initiatives in the early 1970s and continuing now, there has been a general trend to increase heliostat size from around 12 m2 to around 150-200 m2, with many counter instances of considerably smaller heliostats appearing in recent years.