Always touted as the fuel of the future but never the present, the age of hydrogen is about to start.
Billions of dollars of federal subsidies are part of a massive industrial policy pushing the energy source. The Department of Energy is pouring $7 billion into a series of regional hydrogen production hubs to make sure that it's available for transportation and heavy industry. It also plans to subsidize the price of hydrogen when produced with green technologies.
By subsidizing the production of clean hydrogen, the government is encouraging its use by the steel, cement, iron, ammonia, petrochemical and specialty-fuel industries.
But policymakers need to make sure the methods used to produce hydrogen are clean. Nearly all the hydrogen currently produced in the U.S. requires carbon-emitting energy sources.
Automakers have spent years developing hydrogen fuel cell passenger cars only to discover there's almost no consumer interest. New-car buyers loo…