What is Blue Hydrogen? How is it produced and what is its role in the energy transition?

What is Blue Hydrogen?

The energy transition is a process of transformation from fossil resources to low-carbon resources to limit global warming. In this process, hydrogen energy is recognized as a critical tool, especially for the decarbonization of industry. However, the environmental value of hydrogen depends on the method of production and the management of carbon emissions.

Blue hydrogen is a hydrogen production technologybased on carbon capture and storage (CCS) technologies that acts as a bridge between the existing infrastructure based on fossil fuels and full clean energy (Green Hydrogen) during this transition.

Definition and Characteristics of Blue Hydrogen

Blue hydrogen is a form of energy that continues to use methods of hydrogen production from fossil fuels in the production process, but where the resulting carbon dioxide (CO₂) emissions are captured and stored instead of being released into the atmosphere. This method aims to achieve low-carbon energy production.

Industrial research and pilot projects have focused on the integration of hydrogen-based production and carbon capture and storage (CCS) technologies. This technology offers a solution, especially in hard-to-abate sectors such as steel, cement and chemicals.

Differences with Gray and Green Hydrogen

The "colors" of hydrogen are distinguished according to the sources of production and carbon density:

Gray Hydrogen:

Usually produced from fossil fuels such as natural gas or coal, and the carbon released during the process is released into the atmosphere. This method creates high carbon emissions.

Green Hydrogen:

Produced using renewable energy sources such as solar and wind and is considered "zero emission". For countries like Turkey, green hydrogen offers the opportunity to create new green industries.

Blue Hydrogen:

Like gray hydrogen, it uses fossil resources but traps emissions through carbon capture and storage technology. This makes it cleaner than Gray, but less sustainable than Green (as it is fossil resource dependent).

How is Blue Hydrogen Produced?

Blue hydrogen production is fundamentally based on the processes of hydrogen production from fossil fuels. However, unlike traditional methods, CCS (Carbon Capture and Storage) units integrated into the production facility come into play.

Resource Utilization:

Production usually starts with hydrocarbon resources such as natural gas.

Carbon Capture:

CO₂ generated during the process is captured by technological filters and chemical processes before being released through the stack.

Storage:

Captured carbon is stored in underground geological formations or stored for industrial use.

This process is of great importance as hydrogen is one of the priority sectors under the Border Carbon Regulatory Mechanism (BCDRM/CBAM). Reducing the embedded emissions (SEE) of exported hydrogen provides a cost advantage in the EU market.

Advantages and Disadvantages of Blue Hydrogen

Blue hydrogen plays a strategic role in the energy transition, but it also brings risks and opportunities.

Advantages:

Emission Reduction:

Thanks tocarbon capture and storage technology, it significantly reduces emissions compared to conventional methods.

Transition Tool:

Provides low-carbon energy using existing natural gas infrastructure until fully renewable infrastructure is in place.

Disadvantages and Risks:

Fossil Fuel Dependency:

Generation is still based on fossil resources. Fossil fuel-oriented investments risk becoming "stranded assets" as regulations tighten.

Full Sustainability Debate:

Green is not fully renewable likehydrogen. The ultimate goal in terms of environmental sustainability is complete independence from fossil resources.

Cost and Regulations:

The cost of carbon capture technologies is high. In addition, emissions (Scope 1 and 2) need to be strictly reported and verified under regulations such as CBAM.

Analogy:

Blue Hydrogen can be likened to a hybrid vehicle. It is not as green as a fully electric(Green Hydrogen) vehicle, but it emits much less emissions than an older model diesel(Gray Hydrogen) vehicle. Like hybrid vehicles, Blue Hydrogen is a temporary but critical bridge technology to get us to the goal until a full clean energy infrastructure is in place.