This apparatus stores natural energies available on and/or under the surf of the world's oceans. Such energies include solar energy, wave energy, wind energy, as well as energy stored in the heat of the sea water. The energy extracting and storing equipment is installed on a floating vessel or raft. The energy storing equipment includes flywheel type rollers or cylinders driven by electric motors energized by electric generators which in turn receive their energy from the energy extracting equipment. The flywheel type rollers or cylinders include a supporting hollow cylinder having a relatively thin wall onto which there are wound fibers impregnated or embedded in a synthetic resin.