Low-carbon hydrogen: the key concepts explained
Low-carbon hydrogen is emerging as a key solution for reducing emissions in hard-to-abate sectors such as industry, transport and energy. This glossary explains the main production methods, regulatory frameworks and applications supporting the development of a lower-carbon hydrogen economy.Low-carbon hydrogen: the key concepts explained
Low-carbon hydrogen is emerging as a key solution for reducing emissions in hard-to-abate sectors such as industry, transport and energy. This glossary explains the main production methods, regulatory frameworks and applications supporting the development of a lower-carbon hydrogen economy.
Key takeaways
- Low-carbon hydrogen is produced while generating significantly lower greenhouse gas emissions compared with conventional fossil-based hydrogen.
- It relies on specific production methods and carbon intensity thresholds defined by regulations.
- It has a key role to play in industrial decarbonisation and synthetic fuels, as well as net-zero strategies.
- UK and EU standards define how low-carbon hydrogen is classified and certified.
- Deployment depends on available technology, the cost of electricity, available infrastructure and public policy.
Low-carbon hydrogen: definition and characteristics
Hydrogen is a gas widely used in industry and is mainly produced from fossil fuels. This means that conventional production generates high carbon emissions.
Low-carbon hydrogen, on the other hand, generates less greenhouse gas emissions per unit of hydrogen produced.
Low-carbon hydrogen can take different forms depending on the production method used and the emissions profile achieved. The definition given by regulators focuses on lifecycle emissions rather than colour labels.
In addition, certification frameworks play a key role in ensuring that hydrogen production complies with sustainability and carbon-intensity criteria. They provide transparency on the origin and environmental performance of hydrogen while helping project developers and investors demonstrate compliance with regulatory requirements.
Production methods and technology involved
There are two main production methods.
Renewable or low-carbon electricity electrolysis
Electrolysis uses electricity to split water into hydrogen and oxygen. When powered by renewable electricity, the emissions footprint is significantly reduced.
Production costs depend heavily on the cost of electricity and overall system efficiency. Over the long term, scaling up electrolysis facilities may reduce costs through technology learning effects.
Fossil-based hydrogen with carbon capture and storage (CCS)
Hydrogen can also be produced from natural gas combined with CCS. When produced in this way, CO₂ is captured before release, thereby lowering greenhouse gas emissions.
The final carbon intensity depends on capture rates and infrastructure performance.
Both production processes require industrial facilities and integration with existing energy networks.
Potential applications across sectors
Low-carbon hydrogen has multiple uses across various sectors.
Different users across transport sectors and industry require special infrastructure and regulatory compliance.
Standards and regulations in the UK and EU
Regulation is central to the use of hydrogen.
In the EU, specific laws and sustainability guidelines set out criteria for hydrogen criteria and emissions thresholds. Meanwhile, in the UK, government frameworks specify carbon intensity benchmarks.
These regulatory standards have a direct influence on:
- Access to subsidies
- Project financing
- Commercial viability
- Market transparency
Given the scale of investment required, regulatory clarity obviously reduces uncertainty for companies and investors.
Environmental sustainability and net zero targets
Low-carbon hydrogen has a key role to play in supporting national and international climate policy by reducing greenhouse gas emissions in those sectors where decarbonisation is challenging. In particular, it has a part to play in:
- Net zero strategies in Europe and the UK
- Lower carbon footprint across industrial value chains
- Reduced dependence on fossil fuels
However, sustainability performance depends on renewable energy sources and CCS, as well as a lifecycle approach to planning and accounting.
Hydrogen should be seen as just one component of a broader energy transition strategy rather than a standalone solution.
Key questions about low-carbon hydrogen
- High production costs
- Infrastructure investment needs
- Technology scaling challenges
- Regulatory complexity
Commercially viable hydrogen projects require stable demand and policy support.
- Industrial decarbonisation
- Development of new hydrogen production facilities
- Growth in synthetic fuels markets
- Increased energy security
Over time, technology improvements and larger facilities may lower costs and strengthen competitiveness.
