A leaked draft of Treasury Department rules for hydrogen tax credits in President Joe Biden’s climate law is drawing warnings from advocates that they may stifle the burgeoning industry.

Rolls-Royce Holdings backed away from electric aircraft and said conventional propulsion will remain the mainstay in coming years as hydrogen takes time to mature as an alternative.

Fortescue Future Industries’ Phoenix Hydrogen Hub in Arizona moved another step closer to fruition after it inked a memorandum of understanding with Plug Power for equipment.

Seven regional hydrogen hubs that received the administration’s OK face up to 12 years before achieving commercial output no later than 2035, according to a Department of Energy timeline.

AUSTIN, Texas — Transportation experts agree that there is no single answer for which alternative power source is best to carry the trucking industry to a zero-emission future.

President Joe Biden announced Oct. 13 that seven state-backed regional hubs will receive a total of $7 billion for hydrogen fuel production in his ambitious push for zero-emission green energy.

Truck maker Nikola agreed to sell its Phoenix Hydrogen Hub project to partner Fortescue Future Industries for $24 million, the companies said.

Truck makers and suppliers are taking steps toward developing hydrogen combustion engines on the path to a zero-emission future.

Florida and South Korean officials signed a pact to create a hydrogen research hub, set to break ground next month in Polk County.

Several state consortiums met the April 7 deadline to be among the nation’s first hydrogen hubs as the U.S. Department of Energy begins to evaluate applications for funding.