In December, the California Fuel Cell Partnership tallied 8,890 electric cars and 48 electric buses running on hydrogen batteries, which are refillable in minutes at any of 42 stations there. On the East Coast, the number of people who own and drive a hydrogen electric car is somewhat lower. In fact, there is just one. His name is Mike Strizki. He is so devoted to hydrogen fuel-cell energy that he drives a Toyota Mirai even though it requires him to refine hydrogen fuel in his yard himself.

“Yeah I love it,” Strizki said of his 2017 Mirai. “This car is powerful, there’s no shifting, plus I’m not carrying all of that weight of the batteries,” he said in a not-so-subtle swipe at the world’s most notable hydrogen naysayer, Elon Musk.

Strizki favors fuel-cell cars for the same reasons as most proponents. You can make fuel using water and solar power, as he does. The byproduct of making hydrogen is oxygen, and the byproduct of burning it is water. Hydrogen is among the most plentiful elements on earth, so you don’t have to go to adversarial countries or engage in environmentally destructive extraction to get it. The car is as quiet to drive as any other electric and it requires little maintenance.

His infatuation with hydrogen began with cars, but it didn’t end there. In 2006 he made the first house in the United States to be powered entirely by hydrogen produced on site using solar power.

Strizki is using his retirement to evangelize for the planet-saving advantages of hydrogen batteries. He has faced opposition from the electric, oil and battery industries, he said, as well as his sometimes supporter, the Energy Department. Then there is the ghost of the 1937 Hindenburg explosion, which hovers over all things hydrogen. The financial crash of the high-flying hydrogen truck manufacturer Nikola has not advanced his case.

Strizki’s expertise has made him a cult figure in hydrogen circles, where he has consulted on notable projects for two decades. He has worked on high school science projects as well as a new $150,000-ish hydrogen hypercar that claims to get 1,000 miles per fill-up.

“Oh, I know Mike Strizki very well, very well,” said Angelo Kafantaris, chief executive of Hyperion, the company that makes that Hypercar, the XP-1. Using a federal-standard dynamometer test, the XP-1, which claims a 0-to-60-mph time of 2.2 seconds and a top speed of 221 mph, is said to achieve a range of 1,016 miles on a single tank. “I think Mike is an integral part of everything we do at Hyperion,” Kafantaris said.

Strizki, 64, discovered hydrogen power while working at the New Jersey Transportation Department’s Office of Research and Technology. Batteries that powered electric message signs didn’t hold a charge in severe cold. Strizki was tasked with finding a solution. He turned to hydrogen fuel cells such a those NASA used in space.

He left his state job for the private sector where he worked on Peugeot’s hydrogen concept car, a mini fire engine and then a Chrysler hydrogen minivan, the Natrium, which was a modified Town & Country and went zero to 60 in a glacial 16 seconds.

Bringing hydrogen vehicles into wide use on the East Coast strained even Strizki’s talent for invention. For instance, hydrogen is not authorized to travel via bridges and tunnels.

“We wouldn’t want to put out a vehicle that you couldn’t drive into Manhattan,” said Gil Castillo, who tracks regulations at Hyundai Motor North America.

Ever since Musk called fuel cells “staggeringly dumb,” there has been a fierce rivalry between lithium-ion and hydrogen backers. Cooler heads see a place for each. Electric is suitable for people with a garage who travel limited distances and can charge overnight. But for long-haul trucks, hydrogen doesn’t add weight or reduce cargo space the way batteries do. Furthermore, hydrogen tanks can be refueled in minutes.