The engine system with communicating fluid vessels has an interconnecting lever conduit configured to rotate about an axis. A first fluid container is fluidically connected to the interconnecting lever conduit and positioned at or near the axis. A second fluid container is fluidically connected to the interconnecting lever conduit and positioned at or near an end of the interconnecting lever conduit. Liquid fluid is movable between the first and second fluid containers through the interconnecting lever conduit. The interconnecting lever conduit with the first and second fluid containers is rotationally balanced about the axis. A shift of fluid mass between the first and second fluid containers rotates the lever about the axis, thereby generating an energy output.

The engine system with communicating fluid vessels has first, second, and third fluid containers each containing a fluid. At least one interconnecting lever conduit contains the fluid and is rotatably coupled to the first, second, and third fluid containers. The interconnecting lever conduit is pivotal about an axis and defines a fluid passageway by which the first, second, and third fluid containers are in fluid communication. At least one buoyant member and at least one holding tank are positioned in each of the first and third fluid containers. A tether is physically linking together the holding tank of each of the first and third fluid containers. Supplying the gas to the interior of the holding tank displaces at least some of the fluid from the interior of the holding tank to increase a column height of the fluid in each of the first, second, and third fluid containers.

Apparatus and methods for generating mechanical energy utilizing gravity and leverage. In one aspect of the invention, a power plant having one or more gravity powered units is adapted to generate mechanical energy, which may be captured and used as mechanical energy or converted to electrical energy for use locally or remotely. The energy may be stored for later use, for example, in the form of electric energy, fluid flow energy, hydraulic energy, compressed air or fluid, or a combination of these. The energy may be stored in any a ro riate stora e medium.