If_Scope2_Is_Dirty,Your_Hydrogen_Isn’t Clean
Dr. Anju Sharma
KtalystInsights™
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Grey hydrogen is the older brother who shows his electricity bill.
e-Hydrogen? Same bill. Better outfit. Louder PR.
This week’s news makes this distinction important:
a Germany_China joint venture announced a large electrolyser manufacturing facility in Germany.
On paper, it’s being celebrated as progress for green hydrogen.
In reality, it’s progress for electrolysis capacity.
And that distinction matters.
Let’s stop debating colours and look at carbon accounting.
KtalystInsights™:
Hydrogen colours don’t describe molecules. They describe who pays for carbon and who postpones it.
Hydrogen types — stripped to facts
1) GreyHydrogen (SMR)
✓ Scope 1: 8–12 kg CO₂/kg H₂
✓ Scope 2: ~0.5–1 kg CO₂/kg H₂
✓ Carbon-heavy, but transparent
2) BlueHydrogen (SMR + CCS)
✓ Lower Scope 1 on paper
✓ Capture efficiency + methane leakage decide reality
✓ Carbon risk is engineering + verification
3) eHydrogen (Grid Electrolysis)
✓ Scope 1: ~0
✓ Scope 2: 15–22 kg CO₂/kg H₂ (EU grid)
✓ Often worse than grey on fossil-heavy grids
✓ Carbon doesn’t disappear — it moves to Scope 2
4) GreenHydrogen (Renewables + Electrolysis)
✓ Scope 1: ~0
✓ Scope 2: ~0
✓ Requires additional, renewable, time-matched power
✓ Still <1% of global hydrogen
5) TurquoiseHydrogen (Methane Pyrolysis)
✓ No CO₂ in reaction (solid carbon instead)
✓ Footprint depends on clean heat/electricity
✓ Promising — but early-stage
The uncomfortable truth
✓ Grey hydrogen owns its emissions
✓ Blue hydrogen promises reduction
✓ e-Hydrogen often outsources carbon to the grid
✓ Green hydrogen earns its colour — only with clean power
✓ Turquoise avoids CO₂ — but Scope 2 still decides
If your Scope 2 isn’t clean, your hydrogen isn’t green.
What cuts through colour codes
✓ Global hydrogen today: ~95–100 Mt/year
✓ >99% is fossil-linked
✓ Grid electrolysis: 15–22 kg CO₂/kg H₂
✓ Grey hydrogen: 8–13 kg CO₂/kg H₂
✓ >60% of hydrogen cost variability now comes from power price + grid carbon
KtalystKlues
Hydrogen won’t turn green through colour labels.
It will turn green when the grid does measurably, hourly, transparently.
Originally published on LinkedIn on 2026-01-03 04:16:28: https://www.linkedin.com/feed/update/urn%3Ali%3AgroupPost%3A1910576-7413070723436462080
