NOVELTY - A hydrogen storage system comprises: (i) hydrogen storage container(s) disposed in a confined area; (ii) a vent line extending from the storage container(s) to a location outside and having an operable valve; (iii) sensor(s) disposed in the confined area for detecting unsafe conditions; and (iv) actuator(s) in communication with the sensor for actuating the operable valve of the vent line.    USE - For use in a power system for providing back-up power to a facility (claimed).    ADVANTAGE - The assembly provides an alternative to diesel and other forms of fuel for back-up electrical power systems. The stored hydrogen can be used for other purposes provided that the storage maintains a minimum desired amount for providing the back up power system functionality.    DETAILED DESCRIPTION - A hydrogen storage system comprises hydrogen storage container(s) disposed in a confined area; a vent line extending from the storage container(s) to a location outside the confined area and having an operable valve; sensor(s) disposed in the confined area for detecting predetermined unsafe conditions relating to the storage of hydrogen in the confined area; and actuator(s) in communication with the sensor for actuating the operable valve of the vent line to release hydrogen from the hydrogen storage container to a location outside of the confined area at a minimum predetermined release rate in response to a signal received from the sensor relating to a sensed unsafe condition.    An INDEPENDENT CLAIM is also included for a power system for providing back-up power to a facility comprising a generating system disposed at the facility having hydrogen generator(s) and hydrogen powered electrical generator(s); a storage system disposed at the facility having storage container(s) for receiving hydrogen from the hydrogen generator; a conduit for hydrogen from the hydrogen generator(s) to the storage system; a conduit for supplying hydrogen from the storage system to the electrical generator(s); a sensor for sensing the supply of electric power from a primary electric power source; and an actuator in communication with the sensor for actuating the electrical generator(s) to generate electricity in response to a signal from the sensor indicating an interruption in the supply of electricity from the primary electric power source.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a power system with a hydrogen storage system.