The number of people graduating with nuclear engineering degrees has more than tripled since a low point in 2001, and many are passionate about their motivation.
"I'm here because I think I can save the world with nuclear power," Leslie Dewan told the crowd at a 2014 event as she pitched her company's design for a new kind of reactor.
Dewan says climate change, and the fact that nuclear plants emit no greenhouse gasses, is the big reason she became a nuclear engineer. And she's not alone.
"The reason that almost all of our students come into this field is climate change," says Dennis Whyte, head of the Department of Nuclear Science and Engineering at the Massachusetts Institute of Technology.
The surge in new engineers comes as the nuclear industry, just like coal, is struggling to compete against cheaper natural gas and renewable energy. The Nuclear Energy Institute estimates that more than half of the nation's 99 nuclear reactors are at risk of closing in the next decade.
President Trump has ordered Energy Secretary Rick Perry to take steps to help financially troubled coal and nuclear power plants, though he's cited the reason as grid resilience and national security.
But nuclear plant operators are echoing young engineers like Dewan as they lobby for public subsidies to keep reactors open.
"If you are concerned about climate change, or concerned about the environment, you should be very concerned about the future of TMI [Three Mile Island]," says David Fein, Exelon's senior vice president of State Governmental and Regulatory Affairs.
Parent company Exelon announced last year it will close Three Mile Island Unit 1 in 2019 unless there are policy changes that would make the plant profitable again. A different reactor on the site near Middleton, Pa. — Unit 2 — was involved in the country's worst nuclear accident in 1979.
Fein is among those who argue that nuclear plants should be recognized as clean energy, and paid for the public benefit of not emitting greenhouse gasses or other pollutants. It's a strategy that's worked in other states: Illinois, New York and — most recently — New Jersey.
In Pennsylvania's capitol in Harrisburg, opponents of new subsidies include anti-nuclear activist Eric Epstein with the watchdog group Three Mile Island Alert.
"If you consider nuclear green then you have to ignore high-level radioactive waste," he says.
The federal government still doesn't have permanent storage for that waste, and Epstein says there are the environmental costs of uranium mining to consider as well.
Others question giving nuclear plants public money that could be used for renewable energy instead.
"It really is this sort of philosophical battle: are we building the energy economy of the future? Or are we just, sort of, keeping with the status quo?" says Abe Silverman Vice President for Regulatory Affairs Group and Deputy General Counsel for NRG, which has opposed state subsidy proposals.
The nuclear industry thinks it has a good chance of convincing people to support its side of this debate.
Ann Bisconti does opinion research for the industry and says a lot fewer people oppose nuclear energy now than just after the Three Mile Island accident.
"People have moved, very much, into middle positions — they're very mushy on nuclear energy," Bisconti says. And she says that creates an opportunity to win them over by talking about the need for nuclear to limit the effects of climate change.
"You can't get there without nuclear in the fuel mix," says Chris Wolfe, who works as a generation planning engineer at South Carolina Electric and Gas and is on the board of of North American Young Generation in Nuclear.
Despite the industry's struggles, the U.S. still gets a fifth of its electricity from nuclear, and there are jobs to be had.
The number of nuclear engineering degrees awarded each year peaked in the late 1970s. Then it dropped steadily amid the Three Mile Island partial meltdown in Pennsylvania and the Chernobyl disaster in the former Soviet Union. Numbers started to climb again in 2001 as talk of climate change increased. That left an age gap in the nuclear workforce with many now ready to retire.
"Baby boomers are leaving the industry so there are a lot of job opportunities," says Wolfe.
Wolfe chose to work at a utility for job security, but she's cheering on nuclear entrepreneurs like Leslie Dewan, who co-founded a start-up business called Transatomic Power. She says the company has raised about $6 million from investors.
"We're adapting something that's called a molten salt reactor that was first developed in the very, very early days of the nuclear industry--back in the 1950s and 1960s," Dewan says. With modern materials and a few changes she believes such a reactor can be financially viable today.
Her company's first design aimed to use spent nuclear fuel to generate electricity. But it turned out some of the calculations were wrong.
Still, she says this new design would produce about half the waste of existing nuclear plants. And Dewan says it's safer because the effects of a meltdown would be limited to the plant site.
"Part of why we started this company is that we wanted the type of nuclear reactor that people would want to have in their communities," says Dewan.
That's a hard sell to anti-nuclear activists like Epstein, of the watchdog group Three Mile Island Alert.
"I'm seeing the same arrogance I saw in the '70s," he says. "I think the new generation is like the old generation, in that they view themselves as flawless high priests of technology."
Dewan sees that skepticism as a legacy her generation will have to address. But she thinks the problem of climate change is too important to give up on nuclear energy now.
Molly Samuel of WABE contributed to this report.
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