A barge supported electrical generation system that includes: a barge with a catamaran style hull; pontoons on each side of the barge; articulating mounts supporting each pontoon; and a generator, which is connected to a series of pulleys. An opening is provided within the hull of the barge with a mechanism to turn the generator positioned in the opening, where the mechanism contacts water flow below the hull. The mechanism may include a paddle wheel system in one embodiment where a paddle wheel is mounted on a barrel shaft within the opening connected to the series of pulleys. In an alternative embodiment, the mechanism includes an Archimedes screw drive system. The Archimedes screw drive system preferably includes two Archimedes screw drives mounted within the opening connected to the series of pulleys.

A platform-like device for generating electricity from moving fluids has at least two fluid turbines coupled to one another through a frame. The fluid turbines are adapted to rotate in opposite directions. The fluid turbines also provide buoyancy for the platform so that the platform is self supporting in the water. The fluid turbines preferably have helicoid flights (screw-like threads) mounted to generally prolate casings. The fluid turbines preferably connect to electric generators through belt, chain-drive, or other transmission systems. The platform may additional support a wind turbine.

A hydrokinetic energy conversion system (1) comprising a turbine device (2) comprising a rotor (3) displaying a rotational axis (O), which turbine device is arranged to operate with the rotational axis in an inclined orientation vis--vis an incoming body of water (W), and which rotor comprises a blade (10) which is arranged to interact with the incoming body of water such that rotational energy is imparted to the rotor. The blade comprises a first, convex surface (12), a second, concave surface (13) and a free, distal edge (E) where the first surface and the second surface meet. The curvature of the second surface, when viewed in a plane orthogonal to the rotational axis, is such that a maximum depth (Dmax) of the second surface, when measured from a straight line intersecting the rotational axis and the distal edge, is at least 35% of the distance between the rotational axis and the distal edge.

A rotor apparatus for extracting energy from bidirectional fluid flows comprises a first rotor (7) mounted for rotation about an axis of rotation (4) in a first direction of rotation, the first rotor (7) having at least one helical blade (2) with a pitch that decreases in a direction along the axis of rotation (4); and a second rotor (8) mounted for rotation about the same axis of rotation (4) in an opposite direction of rotation and having at least one helical blade (2) with a pitch that increases in the same direction along the axis of rotation (4), wherein fluid exiting the first rotor (7) is passed to the second rotor (8).

A siphonage hydroelectric generation device has a water source, a storage tank fluidly communicating with the water source via a first siphon pipe, at least one channel fluidly communicating with the storage tank and extending obliquely and downwardly, at least one screw turbine disposed in the at least one channel, and at least one power generator connected to the at least one screw turbine. Each first siphon pipe has a siphoning inlet end portion inserted into the storage tank and a siphoning outlet end portion fluidly communicating with a corresponding one of the at least one channel. An end opening of the siphoning outlet end portion is lower than a water level of the storage tank. The at least one channel can receive a stable volume of water from the storage tank via the first siphon pipe by siphonage for stable power generation.