A system and method are provided for generating electrical power or rotational power where the system includes heating thermo-dynamic fluid passing through a heat exchanger causing the fluid to expand and then pass through a turbine to rotate a turbine shaft coupled to an electrical generator to generate electrical power, or to transfer rotational power to rotating machinery. Fluid exiting the turbine can then be cooled before cycling through to the heat exchanger.

The invention relates to a buoyancy force utilization device for converting kinetic buoyancy energy and/or potential energy into an electrical and/or mechanical energy, a temperature barrier device and a method for converting thermal energy into electrical energy, wherein the invention utilizes the cyclic lift and fall of a buoyant body within a fluid to provide an electrical energy.