The present invention concerns a wind power installation comprising a pylon and a pod arranged at the tip of the pylon. The invention further concerns a method of controlling such a wind power installation. In order to prevent a fire from occurring or at least to be able to rapidly extinguish a fire which has occurred, there is provided a first apparatus for producing an inert atmosphere.

An ocean wave generator includes a buoy for floating on the surface of the ocean. A generator is mounted to the buoy. A pulley is mounted on the generator for turning the generator. An anchor cable has a first end wrapped around the pulley and an anchored second end. Upward movement of the buoy and generator due to a wave causes the cable to unwind from the pulley, which turns the generator. A spring connected to the pulley rewinds the anchor cable when the buoy and generator drop into the trough of a wave.

A self-supporting, submersible generating plant for producing electricity from ocean currents, consisting of two counter-rotating, rear-facing turbines with a plurality of rotor blades extending radially outward from two separate horizontal axis that convey the kinetic energy from the two side-by-side, counter-rotating turbine rotors through separate gearboxes to separate generators that are housed in two watertight nacelles that are located sufficiently far apart to provide clearance for the turbine rotors. The two generators and their gearboxes serve as ballast and are located far below a streamlined buoyancy tank that extends fore and aft above and between them. A combination of a leverage system and a pressure-controlled system adjusts the hydrodynamic lifting forces to maintain constant depths. There are systems to purge the ballast water to facilitate the recovery of both individual submersible power plants and a group of many submersible power plants.