Hydrogen Production
Total Watts/Day Description kWh cuMeter Hydrogen Total cuMeters / Day
57,823,920.00 Watts/cuM Hydrogen 3.5 1 16521.12
Electrolysis at 1.48 volts (corresponding to 3.5 kWh per normal cubic metre of hydrogen) would be 100% efficient in the conventional sense. 
http://www.stuartenergy.com/hydrogen/techreview.asp