Carbon Intensities of Hydrogen – Various ‘Colors’ Ranked – EnergyMINUTE

Hydrogen can be produced using many different methods with multiple feedstocks. The most common today include grey and brown hydrogen, which heat up both natural gas and coal to produce hydrogen with a high carbon intensity. Companies are looking to expand low-emission hydrogen, particularly green and blue hydrogen.

Thermal methods for producing hydrogen include gasification, steam methane reforming, and pyrolysis.

Electric methods include electrolysis and high-temperature electrolysis

Sources:

An Extensive Review of Liquid Hydrogen in Transportation with Focus on the Maritime Sector, 2022

Insights into low-carbon hydrogen production methods: Green, blue and aqua hydrogen, 2021