The kinetics of catalytic hydrolysis of stabilized sodium borohydride solutions has been studied for a Ni-metal supported catalyst over a temperature range from 273 to 303 K and a NaBH4 concentration range from 1.34 to 5.44 M. The rate may be represented by the expression: -(dN(NaBH4)/w center dot dt) = k center dot[NaBH4](-0.41)[NaOH](0.13)[H2O](0.68) k = 11579.1 center dot exp(-6269.9/T) The activation energy for the hydrogen generation reaction was determined to be 52 kJ/mol. The factors affecting energy storage density of sodium borohydride based systems and the performance of hydrogen generation reactors are discussed.