Georgia Power (Southern Company)
Vogtle Units 3 & 4 Cost and Schedule Collapse
Estimated impact: ~$21B over the certified budget; seven years late; costs recovered from ratepayers; the completed plant now operates
Georgia Power committed to the first new U.S. nuclear reactors in a generation on a certified budget of roughly $14 billion with in-service dates of 2016 and 2017. The AP1000 first-of-a-kind construction, licensing rework, and the 2017 Westinghouse bankruptcy drove the project to roughly $35 billion and seven years late; Unit 3 entered service in 2023 and Unit 4 in 2024. Unlike V.C. Summer, the owners completed the plant — but only by repeatedly recommitting capital after each overrun, with the cost borne largely by ratepayers through successive rate proceedings. Vogtle is the canonical documented case of nuclear-construction schedule optimism: every interim forecast during 14 years of construction proved too optimistic.
Decision context
Whether to certify and repeatedly recommit to a first-of-a-kind nuclear construction program as costs escalated from ~$14B toward ~$35B — at each review gate weighing the sunk investment and completion optimism against the documented base rate of nuclear megaproject overruns.
Decision anatomy
Red = risk factor present · Green = protective factor present
Biases present in the decision
★ Primary driver · Severity estimated from bias type and decision outcome
Toxic combinations
Reference class base rates
Across all 146 curated case studies in our library:
Lessons learned
- Fourteen consecutive years of too-optimistic interim forecasts on one project is the cleanest documented demonstration that inside-view scheduling does not self-correct — each revision anchored on the previous forecast instead of the reference class.
- The completion-vs-abandonment contrast with V.C. Summer shows the decision that matters is structural: Vogtle’s review gates and deeper owner balance sheet let it absorb overruns that killed the identically-designed sister project.
- A regulated cost-recovery mechanism transfers overrun risk to ratepayers and thereby weakens the owner’s own stop-loss incentive — the capital structure, not the engineering, determined who could survive being wrong.
Source: Georgia PSC Vogtle construction-monitoring dockets and semi-annual Vogtle Construction Monitoring reports (2009-2024); Southern Company 10-K filings (2017-2024); DOE loan-guarantee documentation (SEC Filing)
We caught these patterns in Georgia Power (Southern Company)'s own record — before the outcome.
See the full bias auditwe ran — no login, no card. Then run the same 60-second audit on your own next memo.
Or leave your email, we'll run a strategic memo of your choosing and send the readout within a business day.
Workflows that fire on decisions like Georgia Power (Southern Company)’s
The same Recognition-Rigor Framework that documents this case audits memos in the same shape — before the outcome forces the lesson.