Why Nuclear Plants Cost So Much and Take So Long

The economics of nuclear power - huge upfront costs, long construction, cost overruns and financing - and why interest rates matter so much.

Nuclear power has low fuel costs but very high construction costs.

Upfront costs

A large reactor can cost billions of dollars before producing any electricity.

Long timelines

Construction often takes 7 to 15 years.
Delays are common due to safety requirements and complexity.

Overruns abroad

Hinkley Point C in the UK and Vogtle in the US faced large cost overruns and years of delays.
France’s Flamanville reactor took over a decade longer than planned.

Why financing matters

Because costs come upfront, interest during construction adds a lot. Higher interest rates can make nuclear much more expensive per unit.

Levelised cost

Economists compare sources using the levelised cost of electricity (LCOE): total lifetime costs divided by total output. Nuclear’s LCOE is often higher than solar or wind, but it provides firm, round-the-clock power.

India’s advantage

India’s indigenous heavy water reactors have been built at relatively lower costs than many Western projects.

The interest bill

A reactor takes ten years to build. By completion, interest on loans has added a large share to its total cost, raising the price of every unit it will sell.

Thinking nuclear is expensive because of fuel

Construction and financing costs dominate; fuel is cheap.

Key takeaways

Nuclear has high upfront and low fuel costs.
Construction takes 7 to 15 years with frequent overruns.
Interest during construction raises costs sharply.
India's domestic reactors have been relatively cheaper.