The California Hydrogen Highway is a series of hydrogen refueling stations in California. These stations are used to refuel hydrogen vehicles. As of August 2020^[update], there were 42 publicly accessible hydrogen refueling stations in California.^[1]

The California Hydrogen Highway Network (CaH2Net) was initiated in April 2004 by Executive Order (EO) S-07-04 under Governor Arnold Schwarzenegger with the purpose of promoting hydrogen refueling stations in California.^[2]

In September 2006, California Senate Bill 1505 required 33% of hydrogen to come from renewable energy sources,^[3][4] and other initiatives followed.^[5] As of 2007, 25 stations were in operation.^[6] Some of these hydrogen fueling stations completed the terms of their government-funded research demonstration project and were decommissioned.^[7] In 2012, there were 23 hydrogen fueling stations in California,^[8] eight of which were publicly accessible.^[9][10]

In 2013 Governor Brown signed AB 8, a bill to fund $20 million a year for up to 100 stations.^[11][12] As of March 2024^[update], there were 51 publicly accessible hydrogen fueling stations in California (one station in Hawaii was the only other publicly accessible hydrogen station in the US).^[13]

• Hydrogen highway