A control system or controller solar module array may be operated by (i) programmatically determining, for a given time period, a demand for an output of the solar module array by one or more energy consuming resources at the target location; and (ii) affecting an efficiency of the solar module array based at least in part on the determined demand.
 The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of contract No. NDC-5-55022-01 and contract No. NDO-3-33457-02, both awarded by the Department of Energy.
 This invention was made with U.S. Government support under Subcontract No. NDO-3-33457-02 under the prime contract with National Renewable Energy Laboratory awarded by the Department of Energy. The Government has certain rights in this invention.