A water reservoir system for generating, accumulating, storing, and releasing electrical energy comprises a reservoir wall built in a shallow body of water such as a sea or an ocean with a height exceeding the outside water level by about 10-25 m, thereby defining an interior of the water reservoir. Excess electrical energy from other renewable sources of electricity such as wind, solar power, or supplied by a local power grid is used to operate water pumps to fill the interior of the water reservoir with water during times of peak supply of electricity. Water is drained from the water reservoir to the outside body of water and generates electrical energy by flowing over a plurality of water turbines, thereby generating electricity and supplementing electrical power for the local power grid during times of high demand. Additional interior sources of renewable energy may be used to supplement external sources of electrical power in operating the system of the invention.

A wind power generator is disclosed. The wind power generator includes a wind rotor, a fluid coupling, and a rotary electric machine. The wind rotor is disposed to be rotatable. The fluid coupling includes an impeller receiving a torque inputted thereto from the wind rotor, and a turbine receiving the torque transmitted thereto from the impeller through a hydraulic fluid. The rotary electric machine is configured to generate electricity by the torque transmitted thereto from the turbine.

A vertical shaft wind turbine that is superior in a rotational startability, even at a low wind speed, and is suited to a wind power generator that has high rotational torque. Each blade is an upper-and-lower-ends fixed type vertically long blade which is suitable for use as a wind turbine or a water turbine. The string length and thickness of an upper-and-lower-ends fixed type vertically long blade (8) that is fixed upper and lower ends to a vertical main shaft (7) gradually decrease from a main part (8) thereof to tips of the upper and lower inwardly curved inclined parts (8B, 8B), and a cross section of the main part (8A) is a lift type. A thickness of the cross-sectional shape is continuously and gradually thins from the main part (8) to the tips of the inwardly curved inclined parts (8B, 8B).

A vertical shaft wind turbine that is superior in a rotational startability, even at a low wind speed, and is suited to a wind power generator that has high rotational torque. Each blade is an upper-and-lower-ends fixed type vertically long blade which is suitable for use as a wind turbine or a water turbine. The string length and thickness of an upper-and-lower-ends fixed type vertically long blade (8) that is fixed upper and lower ends to a vertical main shaft (7) gradually decrease from a main part (8) thereof to tips of the upper and lower inwardly curved inclined parts (8B, 8B), and a cross section of the main part (8A) is a lift type. A thickness of the cross-sectional shape is continuously and gradually thins from the main part (8) to the tips of the inwardly curved inclined parts (8B, 8B).

A vertical axis turbine includes a rotatable hub assembly that is configured to be connected to an energy sink and rotatable about an axis of rotation. At least two blades are mounted on the hub assembly, each blade including a leading edge and a trailing edge, the blades being oriented so that the respective leading edges face in a common rotational direction. Each blade further includes a straight section that is substantially parallel to the axis of rotation and two helical sections, the straight section being interposed between the helical sections, and the helical sections extending at least partially around the axis of rotation.

A blade comprises a first blade surface, a second blade surface forming the reverse surface of the first blade surface, a front edge portion connected to the front end of the first blade surface and the front end of the second blade surface and formed in a curved shape convex toward the travelling direction, and a back edge portion connected to the back end of the first blade surface and the back end of the second blade surface extending toward the opposite of the travelling direction, and formed in an acute angle, and the blade is formed to be curved in an arc viewed from the side of the travelling direction.

A turbine (1) with flow diverter (2) comprises a support frame (25) adapted to be anchored to a fixed or movable structure, an impeller (3) rotatably mounted about a rotation axis (R) to the support frame (25) and having a front inlet section for the flow and a plurality of blades (4, 4′, 4″, . . . ) adapted to move continuously upon the rotation produced by the flow between a pushing position and an advancing position in correspondence of the front section, a main flow diverter (2) adapted to be anchored to the support frame (25) and having a peripheral wall (7) adapted to at least partially blind the front section with respect to the flow auxiliary diverter (13) extending from a first section (14) facing one or more blades (4′) in the advancing position to a second section (15) facing one or more blades (4) in pushing position. The auxiliary diverter (13) comprises a plurality of substantially curvilinear conduits (16) in reciprocal side by side position along a substantially radial direction, each conduit (16) having a first opened end (16′) facing the blades (4′) in the advancing position and a second opened. end (16″, 16′″) placed in correspondence of the conveying duet (8).

Disclosed is a system for deploying, stationing, and translocating buoyant wind- and wave-energy converters and/or other buoyant structures or devices, as well as farms of same. Also disclosed is a novel apparatus and/or machine comprising a farm of buoyant wave energy converters deployed by said method and/or configured to be deployed by said method.

The present invention provides a system of wind turbines connected to a single unit electric generator to produce electrical power whereby the wind turbine blades rotate coaxially with a main rotor shaft instead of perpendicular to the shaft axis. In this respect, the wind turbine rotor can face the wind from any direction and does not need to be pointed into the wind to be effective, thus, eliminating the need for a yaw system. Moreover, translation of mechanical to torque of the main rotor drive allows the drive components such as the gearbox and generator to be placed near the ground of each wind turbine improving accessibility for maintenance.

The invention relates to a wind turbine (100) having a rotor (102) rotatable about a vertical axis of rotation (104) having a rotating hub (3) and a plurality of rotor blades disposed along an outer periphery of the rotor (102), each of which have a lower segment (4) and an upper segment (5) attached to an upper distal end of the lower segment (4). The lower proximal ends of the lower segments (4) of the rotor blades are each attached to the rotating hub (3). To form a particularly stable and lightweight platform for the rotor (102) or rotor blades, it is proposed that the lower segments (4) of the rotor blades form an inverted pyramid in conjunction with the hub (3), guy wires (7) and bracing wires (8), wherein the guy wires (7) interconnect first attachment points (6) in the area of the distal ends of the lower segments (4) and the bracing wires (8) connect the first attachment points (6) to the hub (3).