A nuclear plant costs $10-30 billion to build and takes 10-20 years. But once running, it produces electricity at $20-30/MWh for 60+ years. Here's the full economics of nuclear power — construction, operation, waste, and the revival happening now.
Educational content only — not personalized financial, legal, or tax advice.
Nuclear power produces approximately 10% of global electricity and 18% of U.S. electricity from 92 reactors — generating more carbon-free electricity than all solar and wind combined in the United States. Nuclear plants run at capacity factors of 90-93% (compared to 25-35% for solar and 35-45% for wind), providing reliable 24/7 baseload power that variable renewables cannot.
Yet new nuclear construction in the West has nearly stopped. The last nuclear plant to come online in the U.S. was Vogtle Unit 4 in Georgia in June 2024 — completed 7 years late and at a cost of approximately $35 billion, more than double the original estimate. In France, the EPR reactor at Flamanville — begun in 2007 — came online in 2024 at a cost of €13.7 billion vs. an original estimate of €3.3 billion.
The nuclear economics paradox: the cheapest electricity to produce, from the most expensive plant to build.
This connects to Tesla's Supercharger Network) and to The $130 Trillion Energy Transition).
A large conventional nuclear reactor (1-1.6 GW) costs $10-30 billion and takes 10-20 years to build in Western regulatory environments. The Vogtle project's economics:
By comparison, a new natural gas combined cycle plant costs approximately $800-1,200/kW. A utility-scale solar farm costs $800-1,100/kW (but requires battery storage for reliability).
The cost drivers: nuclear plants are one-of-a-kind engineering projects built under stringent nuclear regulatory requirements. Each plant requires unique engineering, bespoke component manufacturing, nuclear-qualified labor, and multi-decade regulatory oversight. The West lost its nuclear manufacturing industrial base during the 30-year pause in construction following Three Mile Island and Chernobyl — rebuilding that base is enormously expensive.
Once built, nuclear plants are extraordinarily cheap to operate. The U.S. Energy Information Administration estimates nuclear operating costs at $20-30/MWh (levelized cost of energy, excluding capital costs). For context:
Existing paid-off nuclear plants can produce electricity at $25-35/MWh all-in, making them among the cheapest generators on the grid. The problem is the enormous capital cost that must be recovered before reaching that operating cost advantage.
Uranium cost: Uranium represents only approximately 5-10% of nuclear operating costs (vs. 60-70% of costs for a gas plant). This makes nuclear economics relatively insensitive to uranium price swings — even tripling uranium prices would add only 10-20% to total costs.
Nuclear's liability: radioactive waste management and plant decommissioning.
Spent fuel: A 1 GW nuclear plant generates approximately 30 metric tons of spent fuel per year. The spent fuel is highly radioactive initially, stored in on-site cooling pools for 5-10 years, then typically transferred to dry cask storage. The U.S. has approximately 90,000 metric tons of spent fuel in on-site storage across 75 sites, awaiting a permanent repository. Yucca Mountain was licensed but not opened due to political opposition.
Decommissioning costs: $300-500 million per reactor, funded by operators through the Nuclear Decommissioning Trust (an escrow-like fund built up over the plant's operating life).
Nuclear is experiencing a genuine revival driven by two forces:
AI data center demand: Microsoft, Google, Amazon, and Meta have all announced or explored nuclear power purchase agreements for data centers that need 24/7 carbon-free electricity. Microsoft signed a 20-year PPA with Constellation Energy to restart Three Mile Island Unit 1 — closed in 2019, reopening 2028 as 'Crane Clean Energy Center.'
Small Modular Reactors (SMRs): NuScale, TerraPower, X-energy, Kairos Power, and dozens of others are developing factory-built reactors of 50-300 MW (vs. 1,000-1,600 MW for conventional plants). The premise: factory manufacture eliminates bespoke engineering costs; smaller size reduces financing risk; modular deployment allows incremental capacity addition. NuScale's VOYGR plant (six 77 MW modules = 462 MW) was the first SMR design licensed by the NRC but cancelled its first project in 2023 due to insufficient subscriptions at the projected cost of $89/MWh. The SMR economics promise remains unproven at commercial scale.