gray hydrogen

or grey hy·dro·gen

[ grey hahy-druh-juhn ]

noun

1. hydrogen that is produced by heating a hydrocarbon, especially natural gas, with steam, resulting in the release of carbon dioxide into the atmosphere. Compare blue hydrogen ( def ), green hydrogen ( def ).

Word History and Origins

Origin of gray hydrogen¹

First recorded in 2015–20

Example Sentences

The dirty way is called gray hydrogen.

From Los Angeles Times

Eventually, they’ll have to compete with gray hydrogen on costs, or government subsidies will need to continue forever.

From Los Angeles Times

If fossil fuels are used, the process results in greenhouse gas emissions, and the result is called gray hydrogen.

From New York Times

Although green hydrogen costs about $5 per kilogram to produce — more than twice as much as gray hydrogen — the U.S.

From New York Times

Today, the company uses “gray” hydrogen, which is produced with natural gas.

From Seattle Times