Leah Stokes, professor of environmental politics at U-C, Santa Barbara, in New York Times, The Big Threat Has Been Climate Change. Now Comes A.I., Sept. 22.

I composed this essay over much of 2026, as I was writing Beyond Vogtle — my detailed study (co-authored with James Boucher) of U.S. nuclear costs from the 1980s post-Three Mile Island reactors to the Vogtle 3 and 4 units completed earlier in this decade. It traces my journey from nuclear power doubter to proponent.

My story is both general and personal: what was changing in the wide world of nuclear power, energy policy and climate; and how I viewed those changes. I  hope this mode of story-telling resonates with a wide audience and also provide a backdrop to “Beyond Vogtle.”

It’s in three parts.

Detail from 1979 rally poster. Full poster appears below.

The first installment begins at the big Washington rally called to mark the Three Mile Island reactor accident, and covers the recession of nuclear dread, the advent of virtually always-on reactor operation, and nuclear’s status as the least carbon-emitting energy supply technology. 

Installment #2 begins with the failure (to date) of carbon tax advocacy — “A Climate Cure No One Wanted” — and continues with the closure of Indian Point and the concurrent slow dissolve of my dream that renewable energy could do it all.

The third and final installment begins with a slight detour in which I contrast the appalling human damage from automobility with nuclear power’s increasingly remote dangers, and then return to energy policy with a fresh way to regard nuclear power’s potential contribution to decarbonizing U.S. grids.

Thank for reading. Enjoy. And be sure to look at Beyond Vogtle: What History Tells Us About the Cost of New Nuclear (yes, that’s the full title).

  — C.K.

*  *  *  *  *  *  *  *  *

I’m pro-nuclear power. Big time.

I don’t just want the U.S. to keep running its 95 extant reactors. I want us to build more. Lots more. Hundreds.

I’m not alone. Public opinion is shifting toward nuclear power. But I came to that conclusion after spending years arguing the other side. From the mid-1970s to the late 1980s, I published a raft of critical analyses that got a good deal of public attention ― and even some traction within the nuclear industry itself. My core argument was that the cost of building nuclear plants was rising much faster than the costs of competing sources of energy. The main driver, I said, was a cascade of safety-requirement changes triggered by widespread fears of reactor accidents.

Here’s the full poster.

That work earned me a speaking spot at the massive May 6, 1979 rally in Washington demanding a halt to reactor construction in the wake of the March 28 meltdown at Three Mile Island in Pennsylvania. In the weeks before the rally, my research was cited in hundreds of news stories. At the Capitol, I stood alongside consumer advocate Ralph Nader, the leading figure in the U.S. antinuke movement; actress Jane Fonda, whose new film, “The China Syndrome,” had eerily foretold the Three Mile Island meltdown; and folk-rock icon Jackson Browne. I told the cheering throng that nuclear power was finished.

Cost overruns and canceled reactor projects were putting billions of dollars on the line, and I spent much of the next decade in courtrooms all over the country, explaining patiently to utility regulators why investors, not customers, should bear those losses. I eventually moved on to other public policy work, sparking big-city bicycling and helping bring congestion pricing to New York. But I kept watching nuclear power and the broader energy landscape. Over time, what I saw led me to turn from skeptic to supporter. Here’s why, in eight parts.

1. Fear and Dread Recede

Ask 100 random people today what “TMI” means, and at least 90 will say “Too Much Information.” Maybe one will mention the 1979 accident at Three Mile Island.

That’s a real shift.

The 1970s were commercial nuclear power’s first decade, and the Three Mile Island accident brought it to a terrifying close. Sixty hours into the slow-unfolding crisis, as fears grew that a “hydrogen bubble” in the reactor might explode and rupture the containment dome, CBS Evening News anchor Walter Cronkite captured the nation’s dread: “The world has never known a day quite like today. It faced the considerable uncertainties and dangers of the worst nuclear power plant accident of the atomic age. And the horror tonight is that it could get much worse.”[1]

The stricken reactor was eventually stabilized. But a combination of soaring costs and public apprehension brought an end to nuclear power’s rapid expansion in the United States.

Cronkite’s warning was about Three Mile Island itself, but it seemed to foreshadow more disasters to come. Yet since 1979, the U.S. nuclear industry has accumulated nearly 20 times as much reactor operating experience as it had built up in its entire history before the meltdown, without a sequel.[2] Like the dog that didn’t bark, this quiet fadeout of reactor calamities is an overlooked shift ― and it is prompting a rethink of long-held certitudes about nuclear power.

With each passing year there are fewer people who grew up with dread from Cold War-era A-bomb drills and weapons test fallout that got bundled into nuclear power. There are more young people like Zeke, a Brooklyn high-schooler who in 2019 went to Battery Park City to greet climate activist Greta Thunberg after her sail-powered trans-Atlantic voyage, but who this past May called fears about nuclear power “over-exaggerated.”[3] (Thunberg herself has said that Germany made a mistake by phasing out its nuclear plants, since it led to a sharp rise in coal-fired electricity.)

I’ve heard the same sentiment in hundreds of casual conversations over the past decade ― at climate rallies and on Trader Joe’s checkout lines, in California and in New York. These conversations suggest that the oppositional currents that once compelled federal nuclear regulators to keep piling on costly new safety requirements are losing force.

2. Permanent Peak Performance

Even before construction costs began to soar in the 1970s, nuclear power had another Achilles heel: spotty operating performance.

Throughout the 1970s and 1980s, the U.S. nuclear power sector struggled to maintain even a 60 percent “capacity factor” ― a measure of how much of a plant’s potential output it generates. That’s a dismal rate for equipment that’s expensive to build. I know this because I researched and wrote the first full-length study of shortfalls in U.S. nuclear plant performance, in 1976.[4]

That started to change in the mid-1980s. Plants finished safety upgrades required after Three Mile Island. The industry began sharing best practices ― and mistakes to avoid. Economic incentives helped too, as utility earnings became tied to how often plants actually ran.

A remarkable turnaround, though seldom credited in climate and nuclear discourse.

The turnaround has been dramatic. Since 2000, U.S. nuclear plants have averaged 90 percent capacity factor ― a huge leap from the earlier 60 percent. In effect, downtime has dropped four-fold, from 40 percent of the time to just 10 percent. Repair jobs and retrofits that used to drag on are now precision-scheduled like the train heist in “Breaking Bad.”

The higher reliability brings a huge symbolic benefit. In the 1970s, U.S. reactors seemed to stumble from one fiasco to the next. In Alabama, a technician using a lit candle to locate an air leak started a fire that burned through a thousand cables and knocked two brand-new reactors offline for 19 months. At some ocean-cooled plants, saltwater corroded delicate heat-transfer tubes, forcing protracted repairs. Profits and industry morale took a beating, and nuclear power became a punchline on “The Simpsons.”

Those days are long past. Nuclear power, uniquely, has blossomed into both grid bulwark and climate hero. Thanks to those higher ― much higher! ― capacity factors, each nuclear plant now displaces 50 percent more carbon-emitting power generation than it used to.[5] In fact, at a 90 percent capacity factor, a kilowatt of nuclear power delivers double or triple the climate benefit of a kilowatt of wind power (which averages 30 to 40 percent capacity factor) and roughly five times that of solar (15 to 20 percent) ― a crucial distinction that’s often missing from gushing coverage of renewable energy.

3. Climate to the Fore

Nuclear power’s newfound operational mastery would matter much less but for the urgency of the climate crisis and the persistence of U.S. and global carbon emissions. Like wind and solar, nuclear power generates electricity without burning carbon.

Squint to see that nuclear lifecycle greenhouse gas emissions range from 5.1 to 6.4 (in g CO2 equivalent per kWh); analogous range for solar-PV is 7.4 – 83.0; wind, 7.8 – 23.0. Source, Dinon et al., in report linked in this section’s second paragraph.

It is true that fossil fuels are implicated in nuclear power’s supply chain. Uranium mining uses petroleum, and enriching nuclear fuel requires electricity. But even counting upstream carbon, nuclear power’s climate footprint is smaller than that of wind, solar or hydropower, according to an authoritative 2022 analysis by a multinational team for the UN Economic Commission for Europe. (Their finding matched that of the similarly comprehensive 2018 report by the UN-chartered Intergovernmental Panel on Climate Change.[6])

That’s another big change. In nuclear power’s early years, uranium fuel enrichment was so energy-intensive that the three U.S. “gaseous diffusion” plants were said to consume 10 percent of all electricity used by American factories. But diffusion enrichment has given way to gas centrifuges and, more recently, laser isotopic separation ― methods that use 20 times less energy to isolate fissile U-235 from U-238.

The bottom line: kilowatt-hour for kilowatt-hour, nuclear-generated electricity is at least as effective as solar and wind at cutting climate pollution. Meanwhile, Hurricane Katrina, Superstorm Sandy, “heat domes” and wildfires, and, in August, the first Himalayan glacial collapse, have made once-hypothetical climate death and disruption a daily reality. More than rising electricity demand from A.I., it’s the climate crisis that’s driving renewed interest in nuclear power.

Click here for the second installment, Why I’m Pro-Nuke Now: Beginning.

[1] Quoted passage is from a local (PA) news site, though the an archived Channel 2 broadcast it cited is no longer on line.

[2] The sole “near-miss,” and a major one, was the 2002 discovery by operators at the Davis-Besse nuclear plant near Toledo, OH of extensive corrosion of the reactor vessel head — a vital barrier against loss of coolant and release of radiation. The U.S. General Accounting Office sternly rebuked the Nuclear Regulatory Commission for failing to identify and prevent the corrosion. See GAO, Nuclear Regulation: NRC Needs to More Aggressively and Comprehensively Resolve Issues Related to the Davis-Besse Nuclear Power Plant’s Shutdown, GAO-04-415, May 2004.

[3] In-person conversation at People’s Policy Conference at the New School for Social Research in New York, May 2, 2026.

[4] C. Komanoff, Power Plant Performance: Nuclear and Coal Capacity Factors and Economics (15 MB pdf), Council on Economic Priorities, 1976.

[5] Dividing today’s 90% uptime by the former 60% yields 1.50, indicating 50 percent more kilowatt-hours per kW.

[6] IPCC Annex III report, Technology-Specific Cost and Performance Parameters, 2018. See table on p. 1333.

This is the second part of a three-part post. It begins with the failure of carbon tax advocacy and continues with the closure of Indian Point and the concurrent dissolution of my dream that renewable energy could do it all. Part I, “Beginning,” started with the Three Mile Island accident and covered the decline of nuclear dread, the advent of splendidly reliable reactor operation, and nuclear’s climate-hero status. It’s available here. — C.K.

4. A Climate Cure No One Wanted

Nuclear fission, wind turbines, solar panels. Each is a kind of miracle, creating electricity from sunlight, air currents, or the splitting of atoms rather than by setting things on fire. But to economists focused on decarbonization, a greater miracle would have been the widespread adoption of carbon taxes, or, as some prefer to call it, a “price on carbon” — a fee added to fossil fuels’ market price based on their carbon content. Such a tax would shift incentives across the economy away from using fossil fuels, cutting production of the main greenhouse gas, carbon dioxide.

Economists trace the carbon tax idea to the early 20^th century British economist Alfred Pigou and his conception of “externalities” ― social costs, like pollution, that aren’t reflected in market prices, and are dumped on communities “external to the process.” My interest dates to the early 1970s, when I was a fledgling environmental analyst in New York City government. I had a front-row seat as an ingenious “sulfur surcharge” eliminated the price advantage of dirty, high-sulfur fuel oil, foiling an eleventh-hour attempt by the oil industry to undercut a groundbreaking clean-air regulation.

Much later, in 2007, I co-founded the Carbon Tax Center, an organization built around the idea of taxing fossil fuels by their carbon content. We proposed a national carbon tax starting at $15 per ton of CO2 and rising in annual steps to $100 within a decade. Our modeling suggested that by then, the myriad changes driven by the financial rewards for burning less carbon would be cutting U.S. emissions by nearly a third ― far more than conventional energy-efficiency standards or clean-energy subsidies.

To be clear, this wasn’t an either-or choice. A carbon tax was unusual in that it reinforced nearly every other decarbonization measure rather than competing with it. But what really set carbon pricing apart was its reach. Carbon taxes would reward every action that reduced fuel use ― not just buying more fuel-efficient cars, but driving less overall; not just laws mandating energy-efficient buildings, but reforming zoning to let new homes be built in town instead of spreading into sprawl; and, in the power sector, switching from higher-carbon coal to lower-carbon gas and from gas to virtually zero-carbon solar, wind, and nuclear power.

A carbon tax would have worked something like New York’s congestion pricing program, which last year began charging drivers $9 a day to enter Manhattan south of 60^th Street. Congestion pricing hits gridlock with a one-two punch. The first punch is the price itself: faced with the toll, enough car owners find driving no longer worth it, that traffic actually drops. The second punch is the steady stream of subway improvements funded from the toll revenue — station elevators, real-time train signals, new lines — which pull still more commuters out of cars. Just so, the “stick” of a price and the “carrot” of better alternatives reinforce each other.

I took part in the 20-year campaign that pushed congestion pricing across the finish line. Its advent — and survival — in Trump’s second term is heartening. But it also highlights, by contrast, how little headway has been made toward a U.S. carbon price.

That failure constitutes a tragically missed opportunity for nuclear power, given how much a $100-per-ton carbon price could strengthen its economics. Compared with burning natural gas, the dominant source of U.S. electricity today, a $100/ton CO₂ price would give nuclear roughly the same competitive edge as shaving 40 percent off the cost to build new reactors. Or, put another way, that carbon price would be like doubling or tripling what gas-fired power plants pay for pipeline fuel — pushing prices back to pre-fracking scarcity levels.[7])

5. Losing Indian Point

In the spring of 2020, with the COVID-19 pandemic raging, my wife and I fled the city for our cabin in the Adirondacks. One morning I was outside the general store, loading groceries onto my bicycle, when my phone started buzzing. It was Dietmar Detering, someone I knew slightly as leader of the advocacy group Nuclear NY, calling from Queens. I picked up and said hello.

“You call yourself a climate activist,” Dietmar began, his voice sputtering with anger. “Indian Point is being taken apart, and you haven’t said a word to stop it. How dare you?”

I vaguely knew that a 2017 deal ― pushed by the self-proclaimed environmental group Riverkeeper and brokered by then-Gov. Andrew Cuomo ― was about to shut down the Indian Point nuclear plant, located on the Hudson River 35 miles north of midtown Manhattan. The older of its two reactors unit would (literally) get the chop within a week; its twin would follow in a year. Both reactor vessels would be cut to pieces and their radioactive components chemically dissolved. Once that process began, there’d be no turning back.

I stood there holding my phone, stunned. A near-stranger was berating me! I would have hung up, but there was something raw in his voice that I couldn’t ignore. I don’t remember exactly what I said ― probably some version of “don’t blame me.” After all, the carbon tax I’d spent years advocating would have made Indian Point too valuable to shut down. Then I offered what I thought was my strongest point: soon enough, Indian Point’s carbon-free electricity would be replaced by zero-carbon wind and solar anyway, so little harm would be done.

Then Dietmar lowered the boom.

“You don’t get it, do you?,” he said, his voice now cold. “Even if all those new solar panels and wind turbines get built, they won’t displace fossil fuels. They’ll just be replacing carbon-free nuclear electricity that was already protecting the climate. They can’t do both.”

“Wait. What? Say that again.”

“Think of it this way,” Dietmar said. “When new renewables have to replace an existing power source that was already displacing fossil fuels, like Indian Point, their net climate benefit is zero. The renewables you’ve been counting on to push out fossil fuels can’t do that job as long as they’re having to take the place of nuclear plants that were already doing the decarbonizing.”

Full disclosure: those aren’t Dietmar’s exact words. They’re actually mine, drawn from articles I later wrote for Gotham Gazette and The Nation, and from a letter I co-wrote with futurist Stewart Brand, yes, the “Whole Earth Catalog” guy, urging California Gov. Gavin Newsom to halt the planned closure of the Diablo Canyon reactors along his state’s coast. But they capture Dietmar’s central point: shutting down a working nuclear power plant ― or any large source of carbon-free electricity ― nullifies the climate benefit that new replacement wind and solar projects are supposed to provide.

Six years later, Indian Point’s closure still haunts me. Why didn’t I speak up? It’s how I imagine I’d feel if a climbing partner had died because of some mistake I made. In New York, where I live, I measure every increment of renewable energy against the carbon benefit we threw away when Indian Point was shut down and dismantled.

By that gauge, wind and solar look mediocre. Take those 42-inch square “balcony solar” arrays that Germans are buying like hotcakes ― they’re a neat idea, but it would take 50 million of them to match the carbon reduction Indian Point provided, as I wrote here in June. Or consider a rooftop solar setup for the City Island boathouse where my ecologically minded physicist pal stows his sailboat ― fine on its own, but matching Indian Point’s climate value would require solarizing 600,000 similar buildings across the state.[8]

Underneath these daunting numbers is Dietmar’s deeper point: all of this new renewable capacity should have been added on top of Indian Point, not built to replace it.

6. Renewables in a Dimmer Light

Solar and wind power were guiding passions of my adult life. From the 1970s onward, I savored every news story about the latest gains in solar efficiencies and blade lengths. Wind turbines especially stirred me, with their kinetic kinship to bicycles and futuristic look.

Befitting my mathematical bent, I would calculate how much fossil fuel each new wind farm would keep in the ground. For Cape Wind, intended as the first U.S. offshore wind farm, near Cape Cod, I consulted a digest of ballpark dimensions to illustrate how much coal the project would displace each year: enough to cover the entire playing field at Boston’s Fenway Park — foul territory included — in a pile three times the height of the park’s famed “Green Monster” outfield wall.[9]

While I was playing with those numbers, a Stanford mechanical engineering professor named Mark Z. Jacobson was launching a stream of papers spelling out just how many wind turbines and solar panels ― on land, at sea, on rooftops, on farmland or rangeland ― would be required to satisfy the energy needs of different states and countries.

A table in Jacobson’s paper for New York helpfully broke down how much energy had to come from each source. Offshore wind was his largest category, charged with supplying 40 percent of New York State’s energy year-round. The number of turbines: 12,700.

That figure should have given me pause. Filling that quota meant building a hundred Cape Wind projects in the waters off Long Island, even as well-heeled locals including Riverkeeper figurehead Robert F. Kennedy Jr. (yes, that Kennedy) and Walter Cronkite (yes, that Cronkite) were NIMBYing the actual Cape Wind project to death. Ditto, wind projects proposed for the next county over from our cabin in the Adirondacks.

None of those projects were ever built — not just because of local opposition, but also because of a lack of full-throated support from environmentalists who should have championed them for their climate value. Especially in liberal Northeastern states, it seemed impossible to build anything that asked property owners to tolerate construction disruption or changed views, decarbonization be damned.

You might expect the outlook for Jacobson’s all-renewables vision for New York to be improving. Wind turbines are now so prodigious that he can propose 8,000 15-gigawatt turbines instead of 12,700 5-gigawatt ones.[10] And solar power has captured the public’s imagination in a way wind power has not — it’s no accident that climate activist (and Jacobson acolyte) Bill McKibben titled his 2025 call-to-action book, “Here Comes The Sun.”

Nevertheless, the carbon-free electricity lost when Indian Point closed has gone almost entirely unreplaced. Nearly nine-tenths of the power it generated is being made up by burning natural gas — not due to corporate chicanery but because no other source has stepped up. (See chart below.)

And dreams of an all-renewables grid still have to contend with an intrinsic fault ― one even more disabling than the NIMBY opposition sparked by the projects’ thirst for land. That weakness is intermittency: the fact that wind and solar output varies not just day to day, but moment to moment, at the mercy of the weather.

Jacobson has doggedly calculated how many megawatt-hours of wind and solar would be needed to match New York’s ― and other states’ ― total annual energy use. But neither his nor anyone else’s atmospheric models are detailed enough, meteorologically, to verify that a 100% wind-water-solar grid could keep the power on continuously ― hour by hour, year in and year out. Building in extra capacity doesn’t solve this problem. Compensating for weather’s unpredictability by deliberately oversupplying wind and solar, or backing them up with batteries, may look good on paper. But either approach would be punishingly expensive and probably insufficient as well, without ample supplies of reliable, dispatchable power such as nuclear. If there’s no wind, having twice as many turbines won’t help.[11]

In New York, the political fallout from losing Indian Point’s copious ’round-the-clock carbon-free electricity is landing on Cuomo’s successor. With the plant’s closure having pushed New York’s carbon-reduction targets out of reach, Gov. Kathy Hochul this year bowed to reality and froze a 2019 law tying New York’s climate and energy future to renewables. Forces ranging from standard-issue Democrats to grassroots greens are pillorying Hochul as a sellout to Big Oil, though her proposal to add five large reactors across the state — she dubs it her Nuclear Reliability Backbone — is almost certainly a more assured path to decarbonization than the fashionable all-renewables approach.

Click here for the final installment, Why I’m Pro-Nuke Now: Conclusion.

[7] The two representations in the text of carbon pricing’s boost to new reactors’ economics are derived and sourced in my Sept. 2026 paper with James Boucher, Beyond Vogtle: What History Tells Us About the Cost of New Nuclear.

[8] Comparisons in this paragraph employ: 2,028 MW capacity and 90% capacity factor for Indian Point; 220 W capacity and 15% CF for balcony solar. 17 kW capacity and 20% CF for boathouse solar. 10 MW and 40% CF for each wind turbine.

[9] Cape Wind assumptions: 130 3.6-GW turbines and 40% capacity factor yield 1,641 GWh/year. Coal assumptions: 9,800 Btu/kWh, 11,500 Btu/lb of coal, 1.32 coal specific gravity, 62.4 lb of water per cubic foot. Calculations yield 132-foot-high coal pile covering Fenway Park’s 128,000 sq ft surface (est’d from http://www.baseball-statistics.com/Ballparks/Bos/index.htm). That is 3-4x Green Monster height of 37 feet, 2 inches, per Wikipedia.

[10] While Jacobson’s new offshore wind configuration would outproduce its predecessor by nearly two to one, he has also upped his forecast for total required energy, leaving constant offshore wind’s share 40 percent share.

[11] To take a recent example: at the onset of a late June – early July 2026 heat wave, New York State’s wind farms collectively were producing less than one percent of their rated 3,000-megawatt capacity. See my “Beyond Vogtle” report (FN 46) referenced in Footnote 7.