Decision IntelGeorgia 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.
What the company’s own filing already carried
Not our reading of a memo. Georgia Power (Southern Company)'s own 10-K, filed 2008-02-25 (11 months before the 2009 decision), was read by the audit engine's deterministic structural layer: the same detectors that run on every audit, with no language model involved. Everything below is drawn from the company's own disclosure, before any knowledge of what followed, and never from the decision itself.
Partly protected: some of the structure would absorb a hit, but the protections do not cover the largest flagged risk.
- Commodity-price-linked cash flowsunprotected
- This reads the company's own 10-K (filed 11 months before the decision), not the decision memo itself, so it can only understate what a full audit of the memo would surface.
- It reads the structure of the situation, not the trigger: whether a shock to the flagged conditions would be absorbed, never that a shock arrives.
- A reading of a dated filing, not a prediction: every condition can be checked against the company's own 10-K.
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
The curated library this case sits in
Across all 155 curated case studies in our library, by documented outcome:
The library is curated toward documented failures, so this split describes the library, not the base rate of deals. The case above is one row in it.
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)
These patterns were flaggable in Georgia Power (Southern Company)'s own record — before the outcome.
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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.