Why are newer nuclear plants so expensive today?

The clip notes that the newest plants are far costlier than earlier ones, with today’s dollars costing well over five times more than reactors from 50 years ago.

What lesson helps lower nuclear costs in other countries?

The expert argues that practice makes perfect—countries like China standardize two plants and repeatedly build the same design to improve efficiency and reduce costs.

What example illustrates US cost challenges in recent builds?

The Vogtle site in Georgia is used as an example where costs ended up over twice what was promised.

Where can I learn more about this topic?

You can check the latest episode of Ask MIT Climate and visit learn.mmit.edu for more MIT climate content.

Why are nuclear power plants so expensive in the U.S.?

MIT OpenCourseWare

Education4 min read2 min video

Mar 5, 2026|2,782 views|205|8

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Key Moments

TL;DR

US nuclear costs high due to halted builds; standardization could cut costs.

Key Insights

US nuclear construction slowed dramatically after the 1970s, eroding the industry's capability to manage large projects and maintain a skilled workforce.

The Vogtle expansion illustrates how high costs and overruns have become common when new builds restart after long layoffs.

A lack of steady market demand left American suppliers, contractors, and financiers wary, elevating risk premiums and keeping prices elevated.

Other countries with active programs, notably China, cut costs through repeated, standardized builds that improve efficiency over time.

The core lesson is to reestablish consistent demand, standardize designs where possible, and scale up production to realize learning-curve benefits.

COST TRENDS AND CONTEXT

The history of U.S. nuclear power reads like a tale of two eras. In the 1970s, the United States completed nearly 50 reactors, riding a wave of optimism about a carbon-free baseload future. Fast forward to the 21st century, and only a handful of plants have been finished, with the Vogtle expansion in Georgia (two large units) standing out as a stark example. The latest numbers place the Vogtle cost well over what was promised, and in today’s dollars the newest plants have become the most expensive ever built, more than five times the cost of the most expensive reactors built half a century ago. This stark contrast reflects underlying shifts in the market, financing, and the industry’s capacity to execute complex construction projects after long periods without building. The combination of rising project risk, long permitting and procurement timelines, and tighter capital costs all contribute to a higher price tag that’s become normalized in the modern U.S. landscape.

UNDERLYING CAUSES OF HIGH COSTS

A central factor driving today’s high costs is the long hiatus in domestic nuclear construction. For roughly 25 years, there was little to no new build activity, which meant the industry’s muscle for managing large construction sites and its sophisticated, interdependent supply chains atrophied. When a project finally moves forward, the industry must rebuild capabilities from the ground up, facing learning curves that come with unfamiliar permitting nuances, procurement hurdles, and schedule uncertainties. Financing costs rise as risk premiums spike, and any delay or design change reverberates through schedules and budgets. In short, a market that stopped building creates a costly catch-up problem for new projects.

LEARNING CURVE AND THE POWER OF PRACTICE

Professor Yakob Guanjouro emphasizes a straightforward lesson: practice makes perfect. Countries with ongoing nuclear programs maintain a steady stream of builds, allowing their teams to refine every element of the process. Repetition drives improvements in design, project management, supply chain coordination, and quality control. Each successive plant benefits from fewer design changes, shorter procurement cycles, and better error detection, translating into lower unit costs and shorter schedules. The core idea is that continuous practice builds institutional memory, enabling more predictable and cost-efficient construction over time.

STANDARDIZATION AS A COST REDUCTION TOOL

One of the most compelling proof-points in the discussion is the idea of standardization: countries with active programs minimize variation in plant design and layout to accelerate learning. By building essentially the same plant repeatedly, developers avoid repeated design changes, reduce procurement fragmentation, and streamline training and commissioning. The result is improved schedule reliability and lower costs. The lesson is not that one-off special designs are impossible, but that a steady stream of nearly identical projects dramatically lowers risk and expense through repeatable processes and mature supply chains.

CHINA AND THE STANDARDIZATION PLAYBOOK

A concrete example of the standardization principle comes from China, where the deployment of nuclear plants has benefited from a simple yet powerful approach: two primary plant designs are standardized and built repeatedly. This approach creates a robust learning curve, enabling faster construction, better quality control, and significant cost reductions as experience accumulates. While political and regulatory contexts differ, the underlying economics—lower per-unit costs with more repetitions—provide a persuasive case for pursuing similar standardization strategies where feasible and safe.

POLICY LESSONS FOR A LOWER-COST PATH

To bring nuclear costs down, the United States would benefit from policies that reestablish a credible, steady demand for new plants and embrace standards that enable mass production. This could include scaled incentives for multi-unit builds, pre-approved safety cases and modularized designs, and streamlined regulatory processes to reduce permitting times. Strengthening domestic fabrication capacity and securing affordable financing through loan guarantees or private-public partnerships would help lower the cost of capital. The overarching aim is to create the conditions for repeated builds that unlock the learning-curve savings seen in other nations.

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The video states that for about 20–25 years the industry stopped building and the construction ecosystem and supply chains collapsed due to a lack of market demand.