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How carbon accounting rules shape incentives for hydrogen production
Gunther Glenk1,2, Philip Holler3, Stefan Reichelstein4,5,6
1Business School, University of Mannheim, Mannheim, Germany. glenk@uni-mannheim.de.
Nature Communications
|August 10, 2026
Summary
Government policies for hydrogen production incentivize investment. Stricter carbon accounting rules for hydrogen offer financial incentives and lower emissions, while less stringent rules increase profitability but also carbon intensity.
Area of Science:
- Energy policy
- Sustainable energy systems
- Carbon accounting
Background:
- Global governments are implementing hydrogen production support programs.
- Policy support levels are often tied to the carbon intensity of hydrogen.
- Power-to-Gas (PtG) systems are crucial for hydrogen production.
Purpose of the Study:
- To compare the financial and carbon emissions performance of PtG systems under different carbon accounting rules.
- To analyze the impact of varying carbon accounting stringency on investment incentives and emissions.
- To inform policy design for hydrogen production support programs.
Main Methods:
- Modeling of Power-to-Gas systems calibrated to US Inflation Reduction Act (IRA) reference plants.
- Analysis of financial incentives and carbon intensity under alternative accounting rules.
- Comparative assessment of policy outcomes based on accounting stringency.
Main Results:
- More stringent carbon accounting rules generally provide sufficient investor incentives for PtG systems.
- Stricter rules can result in carbon intensity levels comparable to natural gas with carbon capture.
- Less stringent rules offer higher profitability and investment incentives but lead to significantly higher emissions due to increased grid electricity procurement.
Conclusions:
- The stringency of carbon accounting rules critically impacts both the financial viability and environmental performance of hydrogen production.
- Policy design must balance investment incentives with the imperative to minimize carbon emissions.
- Even stringent accounting rules may not fully decarbonize hydrogen production compared to other low-carbon alternatives.
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