System for storing compressed fluid

A method for producing of a storage system for storing compressed fluid, comprising:

• providing an excavation in a ground having a shape of an inverted rectangular trapezoidal prism;
• providing a balloon arrangement and mounting the balloon arrangement within the excavation, the balloon arrangement comprising:
• a rebar cage arranged within the excavation;
• and
• an inflatable balloon arranged within the rebar cage and configured for storing the compressed fluid, said inflatable balloon having a middle portion and two end portions, one end portion of said two end portions includes a balloon inlet port for providing access to an inner volume of the inflatable balloon, whereas the other end portion includes a balloon outlet port for releasing the compressed fluid from the inner volume;
• providing a filling material and placing the filling material within a volume between the inflatable balloon, bottom and walls of the excavation to extend from the bottom up to a top of the excavation, thereby to fully surround the inflatable balloon;
• said filling material being in a rigid and immobile state, and configured for providing further reinforcement in conjunction with the rebar cage to the inflatable balloon, and for anchoring the inflatable balloon to the excavation;
• providing a gas pipe assembly comprising an inlet gas pipe configured for filling the inflatable balloon with the compressed fluid and an outlet gas pipe configured for releasing the compressed fluid;
• and
• coupling the inlet gas pipe to the balloon inlet port and the outlet gas pipe to the balloon output port.