operation of respective control valve components recirculating bypassing and feed water heating to adjust molten salt flow and return temperature for optimal performance the valves are controlled by a programmed controller not shown in a control protocol that is responsive to available solar radiation and current temperatures and pressure conditions a second configuration shown schematically in fig3 is based on crs and ptr or another htf system technologies the same reference numbers are used in fig3 as in fig2 to identify comparable elements the sgs comprises htf heat exchangers for preheating economizing water and generating steam evaporator in addition to molten salt heat exchangers for superheating reheating steam htf heated in the ptr receiver 220 in the solar field is used in the sgs when the ptr system is fully on when the ptr system is off and the csp plant is run with molten salt from the tss molten salt is utilized to heat the htf in a separate heat exchanger 225 the control methodology likewise comprises valve components controlling recirculating bypassing and feed water heating to adjust molten salt flow and return temperature for optimal performance in reviewing this disclosure and when considering the illustrations in the drawings various elements are shown or described as being connected or coupled unless otherwise stated or apparent connections and couplings are intended to denote operational relationships and to encompass connections or couplings that are direct as well as through intervening elements or through elements that may be opened or closed in different phases of operation such as valves referring more specifically to fig1 the csp plant shown generally comprises two sos 39 s 100 and 210 or 220 and tss 300 solar energy is collected in each scs and coupled by means of flow paths valves and heat exchangers.