The Role of Hydrogen in Climate Mitigation
By Tianyi Sun, Senior Climate Scientist & Stephane Sartzetakis, Senior Research Analyst, Environmental Defense Fund
Hydrogen has significant potential to cut climate emissions in some of the hardest-to-abate sectors. However, simply increasing hydrogen production will not guarantee global climate benefits. Using hydrogen in areas where electrification is feasible may also undermine potential benefits. This is highlighted in a recent climate impact assessment by the Environmental Defense Fund, published in Frontiers.
Key Findings of the Climate Impact Assessment
The assessment explored hydrogen’s climate advantages across 57 decarbonization pathways and 11 uses, comparing renewable hydrogen, fossil-fuel derived hydrogen with carbon capture, hydrogen-based fuels, and direct electrification. The results emphasize a practical approach to carbon reduction:
- Electrify with Clean Energy Where Possible: Electrification should be prioritized where it can be effectively implemented.
- Use Hydrogen for Unique Needs: Hydrogen should be deployed in contexts where its specific characteristics are essential.
- Demonstrate Climate Performance: Projects utilizing hydrogen must provide proof of their climate benefits from production through usage.
The conclusion is clear: hydrogen is not a universal solution or a significant threat—it is the method of production, application, and lifecycle management that determines its climate impact.
Best Applications for Hydrogen
Renewable Hydrogen as Industrial Feedstock
Renewable hydrogen serves as an excellent industrial feedstock, particularly noteworthy in steel and fertilizer production, delivering the most substantial climate benefit per unit of renewable electricity among all hydrogen applications.
Hydrogen in Sectors with Electrification Limits
In sectors such as shipping and aviation, hydrogen and its fuels become essential where direct electrification encounters constraints. However, for applications like home heating, direct electrification provides 8 to 16 times greater climate benefit per unit of renewable electricity than converting it to hydrogen.
The Importance of Energy Management
Every kilowatt-hour of clean electricity comes with an opportunity cost, prompting the need for policymakers and companies to assess the most effective use of this energy to minimize pollution.
Comprehensive Measurement of Hydrogen’s Climate Footprint
Lifecycle Considerations
The production and lifecycle of hydrogen significantly influence its climate impact. Losses during production, storage, transport, and usage can lead to increased warming:
- Each additional 1% loss of hydrogen reduces near-term climate benefits by approximately 3%.
- Fossil-fuel derived hydrogen with carbon capture could yield considerable benefits, but is heavily reliant on managing methane emissions and verifying carbon capture efficiencies.
Policy and Market Recommendations
The study stresses the significance of accurate and transparent measurement of emissions throughout the hydrogen supply chain. Here are key recommendations:
- Reward Verified Emissions Reductions: Policy frameworks should incentivize genuine reductions in emissions.
- Operational Priorities: The hydrogen industry must prioritize the management of hydrogen and methane leaks.
- Evaluate Electricity Supply and Usage: Investors should scrutinize both the source and intended application of hydrogen alongside its production capacity.
Conclusion
Hydrogen holds a crucial role in transitioning to a cleaner economy but must be part of a well-managed energy strategy to achieve its climate benefits. The most effective projects will clearly demonstrate genuine climate value and reliability in emissions reductions.
