Nuclear power plants are completely safe and produce energy that is 'too cheap to meter.'

The phrase had an elegant precision: energy "too cheap to meter." Lewis Strauss, chairman of the Atomic Energy Commission, used it in a 1954 speech to science writers, describing atomic power's transformative potential in terms that bordered on utopia. No matter that he was speaking generally rather than making a specific engineering promise, the phrase traveled. By the late 1950s and into the 1960s, nuclear power had acquired an almost redemptive character in American popular and educational culture. Clean. Limitless. A second chance after the bombers.

The optimism was not irrational. The physics was real. A small amount of uranium produces an enormous amount of heat through fission, millions of times more energy per unit mass than coal. The first commercial nuclear power plant, at Shippingport, Pennsylvania, came online in December 1957. By 1967, nuclear plants were operating across the United States and Western Europe, and their output was expanding rapidly. Textbooks presented nuclear energy as the obvious future, the solution to both pollution and scarcity. Fuel costs were genuinely minimal compared to fossil fuels. The engineering challenges were acknowledged but treated as solvable problems, not fundamental barriers.

What the optimism elided were the engineering realities that couldn't be designed away. Reactor design required managing enormous energy densities in systems where failure modes could be catastrophic. Control rods had to absorb neutrons precisely. Cooling systems had to work flawlessly, even when power failed. Radioactive waste decayed over geological timescales and had no permanent storage solution. The safety cases assumed everything would work as designed, that operators would make correct decisions under stress, that multiple failures wouldn't compound.

On March 28, 1979, the cooling system at Three Mile Island Unit 2 in Pennsylvania failed. A pressure relief valve stuck open. Instruments gave contradictory readings. Operators, facing confusing data and inadequate training, made decisions that allowed coolant to drain from the reactor core. The fuel rods overheated. Roughly half the core melted. Radioactive gases vented into the atmosphere. No one died immediately, but 140,000 people evacuated the surrounding area. The accident that regulatory frameworks insisted was vanishingly improbable had happened.

Then on April 26, 1986, during a safety test at Chernobyl Unit 4 in Soviet Ukraine, operators disabled safety systems and pushed the reactor into an unstable state. The core overheated, water flashed to steam, and the resulting explosions blew the roof off the reactor building and exposed the burning graphite core to the atmosphere. Thirty-one people died in the immediate aftermath. Radioactive contamination spread across Europe. An exclusion zone remains uninhabitable four decades later. The disaster exposed not just engineering failures but systemic ones: secrecy, inadequate training, pressure to meet targets over safety protocols.

In March 2011, an earthquake and tsunami struck the Fukushima Daiichi plant in Japan. Backup generators flooded. Cooling failed at three reactors. Hydrogen explosions damaged containment buildings. More than 150,000 people evacuated. The disaster demonstrated that even modern reactor designs in a technologically advanced nation with strict safety cultures remained vulnerable to cascading failures.

Together, these three accidents redefined nuclear power's place in the energy landscape. The "too cheap to meter" promise had lasted roughly two decades, long enough to become curriculum, too short to survive contact with reality. Construction costs escalated as safety requirements tightened. Public opposition intensified. No new nuclear plant ordered after 1978 was completed in the United States for more than three decades. Nuclear power remains a low-carbon energy source, and some climate scientists argue it remains necessary. But the redemptive narrative is gone. We understand now that the technology demands perpetual vigilance, accepts no margin for error, and leaves consequences that outlast civilizations.