NOVELTY - The system has an energy storage and power generating unit (12c) anchored to a sea floor and adapted to tether a buoyant structure to the unit, where the unit includes an internal chamber into which water flows through a hydroelectric turbine to generate energy. A pump is powered by energy from a floating structure machinery to evacuate water from the unit. A control system is used to direct power from the machinery to pump water out of the unit when desired and to allow water to flow into the chamber through the turbine to generate energy when desired.    USE - System for harvesting, storing and generating energy e.g. electrical and hydraulic energy (all claimed), from wind and ocean in off shore region. Can also be used for harvesting, storing and generating energy from onshore dams and under water use.    ADVANTAGE - The system provides offshore energy storage and electric power generation system structure that can moor offshore energy harvesting machines such as wind turbines, water turbines, and wave energy machines, and provides energy storage capability. The system provides energy storage capacity with a large chamber deep below the surface of the ocean into which water can flow past hydro turbines to generate electricity when the amplitude of wind, currents, and/or waves is low in order still to generate electricity continually. The system uses a heavy ballasted structure to anchor the energy harvesting structure to the sea floor by virtue of mass. The system holds the structure in place on the sea floor by piles, grouting, or suction anchors. The system uses a central energy storage/generating chamber to serve the needs of multiple surrounding wind, ocean current and/or wave energy harvesting machines. The system uses load-level on-shore power plants for increased overall efficiency, reduced emissions, and reduced fuel usage. The system stores hydrocarbons in the vicinity of undersea wells during hurricane shut-in procedures and during potential well leaks, and allows more rapid retrieval of the hydrocarbons once oil platform operations are allowed to continue safely.    DETAILED DESCRIPTION - The pump is the hydroelectric turbine or a positive displacement pump. The internal chamber is in spherical shape. An INDEPENDENT CLAIM is also included for a hydrocarbon storage system comprising a storage unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a single floating structure with a wind turbine and ocean current turbine.    Floating wind turbines (8)    Catenary line (9)    Wind turbine (10)    Energy storage unit (12c)    Electrical cabling system (14)