Energy companies are betting hydrogen can become a cleaner fuel [Video]

JEFFERSON COUNTY, Texas — This is the first of a three-part series on emerging energy sources and Texas’ role in developing them. Part two, on geothermal energy, publishes Tuesday, and part three, on small nuclear reactors, will publish on Wednesday.

JEFFERSON COUNTY — A concrete platform with fading blue paint marks the birthplace of the modern oil and gas industry in southeast Texas. Weather-beaten signs describe how drillers tapped the Spindletop oil well in 1901, a discovery that launched petroleum giants Texaco, Mobil and Gulf Oil.

Nearby, a red pipeline traces a neat path above flat, gravel-covered earth. French company Air Liquide started building this unassuming facility, with a wellhead and other machinery, on the iconic site in 2014 to store what it believes will be key to an energy revolution: hydrogen.

The ground that once released millions of barrels of oil now holds some 4.5 billion cubic feet …