A fixed target solar thermal tower design is provided that utilizes a low number of collector modules (32, 172, 191), e.g. 5 to 30, mounted on solar-tracking mechanisms. The collector modules may be rotatable so as to reflect incident sunlight onto a target receiver (1200, 192) mounted on a tower (31, 171), and substantially all of the collector modules for a given tower may be located in a rectangular area that extends polewards from the tower by a distance of approximately three times the height h of the target receiver and that is approximately h wide. Each collector module may have a plurality of reflectors (42, 43, 194, 201, 202, 203) that are angled so as to reflect incident light generally towards a common point on the target receiver. Multiple such solar thermal tower plants may be collocated and ganged together to provide higher overall power output.