Specifications include, but are not limited to: 1. Operate using a proton exchange membrane. 2. Produce between 200 and 300 SCF/h of 99.999% (or better) Hydrogen @ a pressure between 200 and 250 psig (without mechanical compression). 3. Include integrated cooling. 4. Powered by 480V, three phase, 60Hz electrical power. 5. Fully automated with an emergency stop. 6. Size of electrolyzer must be less than 120 cubic feet in volume. 7. Weight must be less than 2000 lbm (907 kg). 8. Noise must be less than 85 dB @ 1 meter. 9. System must be designed for use in unclassified space, and must not change the hazard rating of the space where installed. 10. System must have continuous and automatic turndown capability in the range of 100% to 0% net product output. 11. System must include on-board leak detection. 12. System must a reverse osmosis deionized water system. 13. Gas generation system must include a calibration system.