Trackers need not point directly at sun to be effective. If aim is off by 10°, the output is still 98.5% of that at full tracking maximum.
Abdullah et al. designed and constructed a two-axes, open loop PLC controlled sun tracking system. They concluded that the use of two-axes tracking surfaces results in an increase in total daily collection of about 41.34% as compared to that of a fixed one.
Solar concentration is combined with solar trackers to grid PV panels according to the motion of solar to receive considerable sun's energy than fixed PV panels.
Parabolic trough solar thermal systems belong to CSP system, which is commonly available.
This system has parabolic, trough shaped mirrors to focus sunlight on tubes which are thermally efficient and set to receive concentrated sunlight.
These tubes contain a heat transfer flued which it heated to 734°F and pumped through series of heat exchanges to generate super-heated steam to power turbine generators to produce electricity.