Short answer: Yes, under the right conditions, it can even go carbon-negative.

As the hydrogen economy gathers pace, most of the spotlight falls on green hydrogen made by splitting water using renewable electricity. But there’s a quieter, yet worthy contender gaining traction: turquoise hydrogen, produced by methane pyrolysis. And it’s worth paying attention.

What Is Methane Pyrolysis?

Methane pyrolysis splits methane (CH₄) into hydrogen gas (H₂) and solid carbon (C) without emitting CO₂. If powered by renewable electricity (e.g., wind or solar), the process is zero-carbon at the point of production.

When the methane feedstock is renewable natural gas (RNG) from food waste or manure, the process can even become carbon-negative, actively removing greenhouse gases from the atmosphere.

How Does It Compare to Green Hydrogen?

Green hydrogen, produced via water electrolysis, typically requires 50–60 kWh of electricity per kilogram of hydrogen. Its emissions can be near-zero when powered entirely by renewable electricity; however, this depends on the availability and consistency of clean energy. Additionally, green hydrogen production requires significant volumes of water and a stable infrastructure to ensure continuous generation, which may present challenges in regions with water scarcity or intermittent renewables.

Turquoise hydrogen, generated through methane pyrolysis, generally requires 10–30 kWh of electricity per kilogram, indicating lower energy intensity than electrolysis. Instead of emitting carbon dioxide, this method produces solid carbon black, which can be stored or utilized in industrial applications. When renewable natural gas (RNG) is used as the feedstock, the process has the potential to be carbon-neutral or even carbon-negative, depending on system boundaries and emissions accounting. Turquoise hydrogen may also benefit from compatibility with existing natural gas infrastructure.

In terms of cost, some estimates place turquoise hydrogen at approximately $1.6 per kg, making it comparable to grey hydrogen and generally less expensive than current green hydrogen pathways. Part of this cost reduction is attributed to potential revenue from carbon by-products. Reported levelized costs for turquoise hydrogen vary, typically ranging from $1.5 to $2.5 per kg, depending on factors such as pyrolysis method, energy source, feedstock type, and scale.

What Does the Data Say

A recent Life Cycle Assessment (LCA) of thermal plasma methane pyrolysis, specifically at Monolith Materials’ Olive Creek plant provides compelling data in favor of turquoise hydrogen. When using fossil-based natural gas combined with renewable electricity, the carbon intensity (CI) was reported at 0.91 kg CO₂e per kg of hydrogen produced. Remarkably, when 100% renewable natural gas (RNG) derived from food waste was used as the feedstock, the CI dropped to −5.22 kg CO₂e/kg H₂, effectively making the process carbon negative. Compared to conventional steam methane reforming (SMR), this represents an emissions reduction of approximately 88–91%. In terms of energy efficiency, thermal methane pyrolysis also requires significantly less input, 3 to 5 times less than water electrolysis. Notably, even under conservative scenarios that apply a GWP-20 metric and account for high methane leakage, turquoise hydrogen continues to outperform both blue and grey hydrogen, and in many cases, even green hydrogen.

Conclusion

• Energy Efficiency: Electrolysis splits water molecules, which are tightly bound this takes serious energy. Pyrolysis works on CH₄, which is less energy-intensive to crack.
• No Need for CCS: Unlike blue hydrogen (SMR + carbon capture), pyrolysis avoids CO₂ altogether by producing solid carbon. No need to capture or store anything.
• Scalability: It integrates well with existing gas infrastructure, offers co-products like carbon black, and can be deployed faster in many regions.
• Carbon-Negative Potential: With renewable natural gas (RNG), we’re not just looking at a low-carbon energy solution, it has the potential to function as a carbon removal tool. However, its overall climate impact depends heavily on several factors, including the source of the methane and the extent of any leakage during capture and processing. The carbon intensity is also influenced by the electricity mix used in RNG production, especially when considering processes like upgrading biogas. Additionally, the market value of by-products, such as biofertilizers or captured CO₂, can significantly shape the economic and environmental viability of RNG projects.

While turquoise hydrogen presents a promising middle ground between green and grey hydrogen, it also faces several limitations. The technology remains in early stages, with limited commercial-scale deployment, and its economic viability is influenced by demand for solid carbon by-products like carbon black. The pyrolysis process may also introduce residual impurities, and the climate benefits depend on the availability of low-emission energy sources. Despite these challenges, turquoise hydrogen may serve as a transitional option within the broader hydrogen landscape, offering a potentially scalable solution under the right technological and market conditions.