Green Hydrogen Economics

Grey hydrogen from natural gas costs $1-2/kg. Green hydrogen from renewable electricity costs $4-8/kg. The entire green hydrogen economy depends on closing that gap. Electricity cost is the single largest lever.

Green hydrogen's cost breaks down roughly as: electricity 60-70%, electrolyzer capital 20-25%, and operations 10-15%. At $50/MWh electricity, even a free electrolyzer cannot produce hydrogen below about $3/kg. At $20/MWh (achievable with curtailed solar in favorable locations), the same electrolyzer produces at $3-4/kg. The path to $2/kg requires both cheap electricity ($15-20/MWh) and significant electrolyzer cost reductions (from $1,000-1,500/kW today to $300-500/kW).

Calculate the electricity requirement. Producing 1 kg of hydrogen by electrolysis requires roughly 50-55 kWh of electricity. At $30/MWh: electricity cost alone = $1.50-1.65/kg. At $60/MWh: $3.00-3.30/kg. The sensitivity to electricity price is enormous.

Can green hydrogen use curtailed renewable electricity that would otherwise be wasted?

Utilization vs. electricity cost tradeoff. Running an electrolyzer only during curtailment (cheap or free electricity) minimizes fuel cost but reduces utilization. An electrolyzer running 2,000 hours/year at $0/MWh pays more per kilogram of hydrogen (in amortized capital cost) than one running 6,000 hours at $30/MWh. The optimal strategy balances cheap electricity hours against capital utilization.

Green hydrogen at $2/kg is the target. Current costs are 2-4x higher. The gap is closing but not yet closed.

---