Fig. 8: Development pathways for water electrolysis hydrogen production.
From: Economic and environmental competitiveness of multiple hydrogen production pathways in China

a, b Panels are the levelized cost of hydrogen and life cycle carbon emissions, respectively, under scenario 1. c–e Panels are the levelized cost of hydrogen under scenarios 2, scenario 3, and scenario 4, respectively. Key point 1 is the point where the cost of water electrolysis hydrogen production is lower than that of hydrogen production from fossil fuels. Key point 2 is the point where water electrolysis hydrogen production becomes the cheapest pathway to produce hydrogen.