An air-driven generator for generating electric power from movement of a working fluid, wherein the air-driven generator comprises: an elongate gravitational distribution conduit with an upper end and a lower end; plural elongate buoyancy conduits (14A-14D), each buoyancy conduit with an upper end and a lower end; wherein the upper ends of the buoyancy conduits (14A-14D) are in fluidic communication with the upper end of the gravitational distribution conduit and wherein the lower end of the gravitational distribution conduit is in fluidic communication with the lower ends of the plural buoyancy conduits (14A-14D) such that a closed fluid loop is formed between the buoyancy conduits (14A-14D) and the gravitational distribution conduit with working fluid flowing from the upper ends of the buoyancy conduits (14A-14D) fed into the upper end of the gravitational distribution conduit and working fluid flowing downwardly through the gravitational distribution conduit being fed from the lower end of the gravitational distribution conduit into the lower ends of the plural buoyancy conduits (14A-14D); a fluid turbine system (18A-18D) fluidically interposed between the lower end of the gravitational distribution conduit and the lower ends of the buoyancy conduits (14A-14D); and an air injection system (24A-24D) operative to inject air into each of the buoyancy conduits (14A-14D); wherein an injection of air into the working fluid disposed in the buoyancy conduits (14A-14D) will tend to induce upward flow of the working fluid in the buoyancy conduits (14A-14D) and such that working fluid fed to the upper end of the gravitational distribution conduit will have a downward flow within the gravitational distribution conduit to actuate the fluid turbine system (18A-18D), characterized in that the air-driven generator further comprises a heat exchanger interposed between the lower end of the gravitational distribution conduit and the lower end of each buoyancy conduit (14A-14D). an elongate gravitational distribution conduit with an upper end and a lower end; plural elongate buoyancy conduits (14A-14D), each buoyancy conduit with an upper end and a lower end; wherein the upper ends of the buoyancy conduits (14A-14D) are in fluidic communication with the upper end of the gravitational distribution conduit and wherein the lower end of the gravitational distribution conduit is in fluidic communication with the lower ends of the plural buoyancy conduits (14A-14D) such that a closed fluid loop is formed between the buoyancy conduits (14A-14D) and the gravitational distribution conduit with working fluid flowing from the upper ends of the buoyancy conduits (14A-14D) fed into the upper end of the gravitational distribution conduit and working fluid flowing downwardly through the gravitational distribution conduit being fed from the lower end of the gravitational distribution conduit into the lower ends of the plural buoyancy conduits (14A-14D); a fluid turbine system (18A-18D) fluidically interposed between the lower end of the gravitational distribution conduit and the lower ends of the buoyancy conduits (14A-14D); and an air injection system (24A-24D) operative to inject air into each of the buoyancy conduits (14A-14D); wherein an injection of air into the working fluid disposed in the buoyancy conduits (14A-14D) will tend to induce upward flow of the working fluid in the buoyancy conduits (14A-14D) and such that working fluid fed to the upper end of the gravitational distribution conduit will have a downward flow within the gravitational distribution conduit to actuate the fluid turbine system (18A-18D), characterized in that the air-driven generator further comprises a heat exchanger interposed between the lower end of the gravitational distribution conduit and the lower end of each buoyancy conduit (14A-14D).