30 Years After Three Mile Island: Nuclear 'Renaissance'?

Thirty years after the worst nuclear-power crisis in U.S. history, the cooling towers at Three Mile Island look as sleek as ever, seemingly untouched.

And, 30 years later, the ruined reactor inside is still too hot to handle. It is still radioactive, physically and politically.

In all that time, not a single new nuclear plant has been built in the United States, since the March 28, 1979, partial meltdown near Harrisburg, Pa. The Soviet nuclear disaster at Chernobyl in 1986 slowed the industry even more.

But advocates are talking of a "nuclear renaissance." In the past two years, there have been 26 applications to the government to start work on new nuclear reactors, after a 28-year lull.

What has changed? Nothing -- and everything.

Watch the full story on "Focus Earth" on Discovery's Planet Green network this weekend. Check local listings.

"Nuclear will become one of the most important base-load sources of electricity in the world," said Patrick Moore, co-chairman of the CASEnergy Coalition, an advocacy group in Washington, D.C., that touts nuclear technology as a solution to global climate change. "The change in the last three years has been phenomenal."

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There are still 104 reactors in this country, producing 20 percent of our electricity. Of all the major sources of energy in America, it produces no greenhouse gases, which is a subject that has often brought up by President Barack Obama.

"I will invest $15 billion a year in renewable sources of energy, in wind and solar power and the next generation of biofuels," he promised in November. "We'll invest in clean coal technology and find ways to safely harness nuclear power."

Obama says he is "not a nuclear energy proponent," but he does not take it off the table.

Moore of the CASEnergy Coalition, an early leader of Greenpeace, has teamed up with Christine Todd Whitman, the Republican former governor of New Jersey who headed the Environmental Protection Agency for several years under President George W. Bush. They argue that nuclear power is clean, affordable and, Three Mile Island notwithstanding, safe.

They and many U.S. power companies are buoyed by a new Gallup poll, which shows 62 percent of Americans in favor of new nuclear plants. Moore said the closer people are to an existing plant, the more comfortable they are with the idea.

But other people are as uncomfortable with the idea as ever.