First Nuclear Power Plant Opens
Obninsk Nuclear Power Plant in the USSR became the world's first nuclear power station to generate electricity
June 27, 1954
Turning Atomic Energy Into Electricity
The world's first nuclear power plant to generate electricity for a public grid was the Obninsk Nuclear Power Plant in the Soviet Union, which began operating on June 27, 1954. It had a capacity of just five megawatts — enough to power a few thousand homes — but it proved the concept of civilian nuclear power. In the United States, the Shippingport Atomic Power Station in Pennsylvania came online in December 1957 and was the first large-scale nuclear plant in the West, producing about 60 megawatts.
How Nuclear Power Works
Nuclear power plants use the heat generated by nuclear fission — the splitting of uranium or plutonium atoms — to boil water into steam. The steam drives a turbine connected to a generator, producing electricity. The process creates no carbon dioxide emissions, which is one of nuclear power's biggest advantages in the context of climate change. A single kilogram of uranium fuel contains about three million times more energy than a kilogram of coal, making nuclear power extraordinarily energy-dense.
Promise, Problems, and the Future
Nuclear power expanded rapidly in the 1960s and 70s, and today provides about 10 percent of the world's electricity. Accidents at Three Mile Island in 1979, Chernobyl in 1986, and Fukushima in 2011 damaged public confidence and led to policy reversals in many countries. But the need for carbon-free energy is driving renewed interest in nuclear power, including small modular reactors and fusion energy research. The 1954 Soviet plant was the first step in a technology that remains both promising and deeply debated. See the Three Mile Island story for a pivotal chapter in nuclear history.