A retrofitted wind turbine installation for replacing a prior wind turbine installation includes the foundation of the prior wind turbine installation and a replacement wind turbine supported by the foundation, wherein the tower of the retrofitted wind turbine installation is a cable-stayed tower to reduce the bending loads imposed on the foundation. A method of retrofitting an existing wind turbine installation with a replacement wind turbine includes disassembling at least a portion of the existing wind turbine, assembling a replacement tower to a remaining portion of the existing wind turbine installation, attaching a plurality of stay cables between the tower of the retrofitted wind turbine installation and stay cable foundations, and attaching the replacement energy generating unit to the replacement tower.

The improvements in the energy capture systems of sea, river and wind currents, characterized in that the turbines are helical in shape and the turns or threads have an inclination close to 45°, of a quarter-round or quarter-circle section and are placed together with the shafts of the generators that are covered by a casing. or aerodynamic nacelle in front of or on the other side of the support mast. The upper area of the mast can rotate with the generator and have an aerodynamic profile. They can be installed attached to one end by means of a cable between the two banks of a river, or in a narrowing of the same, or they can be subject to elements or means of fastening consisting of a mast, tree, or with a chain, fixed to the ground. at the bottom of the sea or river. The turbines drive a generator and electrical conduction cables and a security and warning facility are added. The generator is placed between the shaft or end of the turbine and the fastening element or means, or behind the mast, on the opposite side of the turbine. In this case, it carries a ball joint at the upper end of the mast. The mast carries deflector plates that are oriented and direct and increase the flow of water or air towards the turbine.

A dynamic adaptive mooring system for wave energy converters (WEC) is disclosed that has a mooring configuration that has a set of fixed mooring lines, and a set of movable mooring lines. When an incoming wave train interacts with the fixed WECs, a set of wave interference points that have higher wave amplitudes than the incoming wave train are formed downstream of the fixed WECs. The movable WECs are then positioned at the interface points to optimize wave energy transfer.

A wind energy farm (1) comprising at least one first wind turbine (2) and at least one second wind turbine (3) is disclosed. Each wind turbine (2, 3) comprises a tower (7) mounted on a foundation, and at least one rotor (9) with a hub carrying a set of wind turbine blades (10). The at least one first wind turbine (2) is provided with at least three stay cables (4), each stay cable (4) being connected at one end to the tower (7) of said at least one first wind turbine (2) and at the other end to a stay cable foundation. At least one of the stay cable foundations and the foundation of one of said at least one second wind turbines (3) of the wind energy farm (1) are combined into a single combination foundation.

An apparatus for extracting power includes a track and an airfoil coupled to the track. The track includes first and second elongate sections, where the first elongate section is positioned above the second elongate section. The airfoil is moveable in opposite directions when alternately coupled to the first elongate section and second elongate section.

A wave power generation apparatus is disclosed. A wave power generation apparatus according to one embodiment can comprise: a floating body floating on the surface of the sea; a power transmission part, which is connected to the floating body so as to receive power generated according to the movement of the floating body, and moors the floating body on the surface of the sea; and a mooring angle adjustment module for adjusting the mooring angle of the floating body for the power transmission part according to the state of the waves acting on the floating body.

An apparatus and methods for installation of an offshore platform for supporting equipment installations is provided. The apparatus includes a vertical compression assembly and a counteracting tensioning tendon system. The vertical compression assembly may comprise multiple compression members, a column truss, or other configurations. The methods of fabrication, load out, and installation provide for cost-effective port and installation vessel requirements.

A submersible power plant and a method for providing a submersible power plant. The submersible power plant includes an anchoring provided at a minimum depth and a vehicle including at least one wing. The vehicle is arranged to be secured to the anchoring by at least one tether rotatably attached to the anchoring by an anchoring coupling and attached to the vehicle by at least one vehicle coupling. The submersible power plant is completely submerged in a body of fluid both during operation and non-operation of the submersible power plant and the tether has an unextended tether length between 2-20 times a wingspan of the wing, specifically between 3-12 times the wingspan of the wing, more specifically between 5-10 times the wingspan of the wing.

A retrofitted wind turbine installation for replacing a prior wind turbine installation includes the foundation of the prior wind turbine installation and a replacement wind turbine supported by the foundation, wherein the tower of the retrofitted wind turbine installation is a cable-stayed tower to reduce the bending loads imposed on the foundation. A method of retrofitting an existing wind turbine installation with a replacement wind turbine includes disassembling at least a portion of the existing wind turbine, assembling a replacement tower to a remaining portion of the existing wind turbine installation, attaching a plurality of stay cables between the tower of the retrofitted wind turbine installation and stay cable foundations, and attaching the replacement energy generating unit to the replacement tower.

An anchoring device for adapting to tide level for a wave energy power generation device comprises: a housing, wherein a central main shaft is provided at the center thereof, two ends of the central main shaft are respectively rigidly connected to a volute spring, and the interior of the housing is divided into several independent compartments, including a central compartment accommodating the central main shaft; a shaft lock and a central main gear capable of driving the central main shaft to rotate mounted on the central main shaft; and a plurality of hoisting wheel compartments arranged at equal intervals in a circumferential array around the central main shaft. A hoisting wheel is provided in each of the hoisting wheel compartments, and an anchor chain wound on the hoisting wheel protrudes out of the housing through an opening at the bottom of the hoisting wheel compartment.