A photovoltaic power source includes a receptacle to receive a photofuel including a liquid, and one or more photovoltaic cells positioned within the receptacle to receive light emitted from the photofuel when the photofuel is in the receptacle. The photovoltaic power source also includes power circuitry coupled to the one or more photovoltaic cells to receive a photocurrent generated by the one or more photovoltaic cells when the one or more photovoltaic cells receive the light emitted from the photofuel. In response to the photocurrent, the power circuitry is coupled to output electricity.