An approach for supplying hydrogen and/or deuterium to LENR and E-Cat based energy generating systems includes receiving a source material that is rich in hydrogen and/or deuterium. A gaseous form of at least one of those elements is extracted from the source material via electrochemical dissociation, hydrocarbon recovery, or a suitable mechanical process. The gaseous form of the element is preferably filtered to remove water vapor and other impurities before being pressurized and supplied to the energy generating system. Advantages of the approach include enhanced safety and system portability due to elimination of a need for pressurized gas storage tanks.