High-speed (17,791 frames per second) photography of brilliant light-emitting expanding plasma formed from the low voltage, high current detonation of the solid fuel with voltage and current waveforms that show plasma at a time when there was no electrical input power for a fuel having no known energy-releasing chemical reaction. Proof of a new energy source is provided by two otherwise inexplicable observations: (i) The formation of a high-energy hydrogen plasma in the absence of any input electrical power, the nonexistence of any energy releasing chemistry with this fuel, and the further impossibility of known chemistry of this high energy. (ii) The emission of soft X-ray radiation at a voltage far less than that of the light energy produced and the inability of any known chemistry to release such high energy.