NOVELTY - An energy system includes a fuel cell stack for generating electricity from hydrogen and an oxidant to form a chemical hydride hydrogen generation system including a storage tank for chemical hydride solution; a reactor containing a catalyst; pump for circulating the solution through the storage tank and the reactor; first connection for supplying hydrogen to the fuel cell; and heat transfer circuit including a second connection.    USE - For generating hydrogen for fuel cell stack.    ADVANTAGE - The novel chemical hydride hydrogen generation system provides safe, clean, efficient, and reliable hydrogen generation system. The hydrogen generation system is safe in that low pressure hydrogen is generated and used in the fuel cell instead of highly pressurized hydrogen. It is also environmentally safe in that the reactions are harmless detergent base chemicals. It can operate at -22 degrees C.    DETAILED DESCRIPTION - An energy system includes a fuel cell stack (3) for generating electricity from hydrogen and an oxidant to form a chemical hydride hydrogen generation system including:    (1) a storage tank (5) for storing a chemical hydride solution comprising a solution of a chemical hydride solute in a solvent;    (2) a reactor (20) containing a catalyst for catalyzing reaction of the chemical hydride to generate hydrogen;    (3) a first pump (26) connected between the storage tank and the reactor in a first circuit for circulating the chemical hydride solution through the storage tank and the reactor so that the chemical hydride reacts to generate hydrogen in the presence of the catalyst;    (4) a first connection between the chemical hydride generation system and the fuel cell for supplying hydrogen to the fuel cell; and    (5) a heat transfer circuit including second connections between the chemical hydride generation system and the fuel cell stack for circulation of the chemical hydride solution through the fuel cell stack to effect heat transfer between the fuel cell stack and the chemical hydride solution.    An INDEPENDENT CLAIM is also included for a method of operating a fuel cell stack and chemical hydride hydrogen generation system by:    (1) supplying a chemical hydride solution to the reactor and permitting the catalyst to catalyze reaction of the chemical hydride solution to generate hydrogen;    (2) supplying the hydrogen to the fuel cell stack and supplying an oxidant to the fuel cell stack for generation of electricity; and    (3) circulating the chemical hydride solution through the fuel cell stack and the chemical hydride generation system to effectively transfer heat between them.    DESCRIPTION OF DRAWING(S) - The figure shows the above energy system.    Fuel cell stack (3)    Storage tank (5)    Heat exchanger (14)    Gas and liquid separator (16)    Reactor (20)    Pump (26)