Abstract: Methods, systems, and apparatus by which steam and/or hot water generated using solar energy may be utilized to generate electricity or work are disclosed herein. A method in one instance may involve driving a first turbine using a fluid having energy obtained from a main energy source other than solar energy, and using solar energy-generated hot water and/or steam as an auxiliary energy input to drive the first turbine. An apparatus in one instance may include (1) a first turbine in fluid communication with and driven by a fluid heated by a main energy source other than solar energy in fluid communication with (2) a solar steam and/or hot water generator that utilizes solar energy to generate hot water and/or steam or other working fluid as an auxiliary energy input source for the first turbine.