Abstract: Certain embodiments make use of an array of passive primary concentrators positioned on the ground that provide primary concentrated solar radiation from below to an array of tracking secondary concentrators. The secondary concentrators further concentrate the solar radiation to one or more centralized receivers. The solar concentrator system may include apparatus for collection of solar radiation, concentration, and the absorbance of the concentrated solar energy. Some embodiments of the solar concentrator system include a large field of passive horizontal primary concentrators, overhead tracking secondary concentrators, and one or more receivers, which convert solar radiation into usable products or energy, such as electricity.