How does a nuclear power plant make electricity?

Hook

Why and how does a nuclear power plant make electricity? There's no explosion and no fire. Just about seventy five tons of uranium fuel, its atoms splitting by the trillions every second. In 2025, nuclear plants produced seventeen percent of all the electricity in the United States.

Fission

It starts with fission. When a neutron hits a uranium two thirty five atom, the atom splits into two smaller atoms. That releases a burst of heat, and two or three more neutrons.

Chain

Those new neutrons can split more atoms, which release more neutrons. That's a chain reaction. Inside a reactor, it's kept at a steady, controlled pace, so each fission causes, on average, exactly one more.

Control

Control rods make that possible. They're made of materials that soak up neutrons. Push them in, and the reaction slows. Pull them out, and it speeds up. In an emergency, they're rapidly inserted all the way to shut the reaction down.

Steam

Here's the surprising part. The rest of the plant works a lot like a coal plant. The heat boils water into steam. The steam spins a turbine, and the turbine turns a generator. Nuclear is just a very powerful way to make heat.

Fuel

The fuel is incredibly dense. The US Department of Energy says a single uranium fuel pellet, about the size of a fingertip, holds as much energy as a ton of coal. And reactors run around the clock, producing about ninety one percent of their full power on average in 2025.

Now

That's why nuclear is back in the news. The US has ninety four operating reactors, and big tech companies have signed deals to buy nuclear power for AI data centers that need electricity day and night.

Close

So a nuclear plant splits uranium atoms to make heat, and uses that heat to boil water and spin a generator. ThatsWhyHow.