Abstract: Radiative heat rejection for the condensate of a steam system in which panels painted with titanium dioxide are put out in the desert and water as a heat exchange fluid is flowed on the underside of the panels. They will radiate into the night sky and produce significant cooling and provide for rejection of condenser heat from Rankine cycle water and steam turbines as well as reflect the sun. In addition to titanium dioxide panels one can use reversible plastic mattresses floating on a cool pond coated black on one side and silver on the other and with the black surface up at night, silver surface up in the daytime; they too will provide radiative heat rejection.