Decarbonization›Electrolysis Hydrogen
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Electrolysis Hydrogen

Hydrogen · Alkaline / PEM / SOEC · LCOH · 45V tier

Electrolysis Hydrogen
kWh/kg, water consumption, carbon intensity (by grid mix), and LCOH for alkaline / PEM / SOEC electrolyzers. Includes 45V tax-credit tier classification (post-IRA).

Electrolyzer Tech

kWh/kg
% of stack
L/kg

Power & Cost

g CO₂/kWh
$/MWh
$/kW
%
yr
%
%/yr
$/m³

📚 Learn the Theory

Water electrolysis hydrogen: PEM/alkaline/SOEC technology comparison, energy efficiency, water consumption, and 45V tax credit tier classification.

Read Engineering Guide →

Engineering Basis

  • Theoretical electrolysis: 33.3 kWh/kg HHV (39.4 LHV).
  • Real: PEM 50-55 kWh/kg, alkaline 52-58, SOEC 35-45 (high-T efficiency advantage).
  • Water: 9 L/kg stoichiometric + 1-15 L cooling/process.
  • 45V post-IRA tiers (kg CO₂e/kg H₂): $3.00 ≤0.45, $1.00 ≤1.5, $0.75 ≤2.5, $0.60 ≤4.
  • Standards: ISO 14687, CertifHy, DOE H2A, IRENA, IEA Future of Hydrogen, IRS 45V.

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