Table 1: Hydrogen scales in commonly used units

Units Large electrolyser Small SMR World-scale SMR
Million ft3/d 0.088 4 100
Thousand m3/d 2.5 113 2830
Tonne/d 0.22 10.1 253
GJ/d (HHV) 32 1440 35900
GW (HHV) 0.00037 0.0167 0.416