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Amazon pivots from Calvert Cliffs data center to fund nuclear plant expansion

Amazon pivots from Calvert Cliffs data center to fund nuclear plant expansion

Built World

Amazon's $3 billion nuclear pact with Constellation adds 190 megawatts to Maryland's grid and funds relicensing

3 days ago: Amazon and Constellation announce nuclear uprate deal

Overview

Updated 1 hour ago

Amazon abandoned plans for a data center beside Maryland's Calvert Cliffs nuclear plant in August after fierce community opposition. Two months later it signed a deal to spend billions upgrading the plant instead.

Under a 20-year agreement with Constellation Energy, the tech giant is backing roughly $3 billion in plant improvements. They add about 190 megawatts of new capacity for the regional PJM grid between 2030 and 2032, enough to power 147,000 homes. The power does not flow directly to Amazon servers.

Constellation gets revenue certainty to seek a second license renewal, pushing reactor operation into the mid-2050s, and to study building small modular reactors at the site. Amazon gets predictable power costs across its East Coast operations.

Why it matters

The deal tests whether tech firms fund grid-scale nuclear to meet AI demand instead of locking up power for their own data centers.

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Key Indicators

$3 billion
Infrastructure investment at Calvert Cliffs
Constellation's planned upgrades to Maryland's only nuclear plant, enabled by the Amazon agreement.
190 MW
New generating capacity from the uprate
About 10% of the plant's current 1,790 MW; enough for roughly 147,000 homes, online 2030-2032.
690 MW
Power Amazon receives long-term
Includes the 190 MW uprate plus output from Constellation's broader fleet under the 20-year deal.
80%
Share of Maryland's clean energy Calvert Cliffs produces
The plant powers the equivalent of more than 1.3 million homes.

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People Involved

Organizations Involved

Timeline

January 1975 September 2026

8 events Latest: 3 days ago
Tap a bar to jump to that date
  1. Amazon and Constellation announce nuclear uprate deal

    Latest Deal

    20-year agreement funds $3 billion in upgrades, adds 190 megawatts by 2030-2032.

  2. County approves data center moratorium

    Policy

    Commissioners vote unanimously for a six-month moratorium on new data center site plans.

  3. Amazon withdraws data center application

    Reversal

    Amazon walks away, citing development timelines and operational requirements.

  4. Voters oust three commissioners

    Election

    Calvert County voters remove three commissioners who opposed a data center pause.

  5. Amazon proposes data center campus

    Proposal

    AWS proposes Calvert Technology Center, eight buildings needing roughly 500 megawatts.

  6. First license renewal in US history

    Regulatory

    Calvert Cliffs is first US plant to renew licenses, extended to 2034 and 2036.

  7. Unit 2 enters commercial operation

    Infrastructure

    The second reactor opens, completing the plant's two-unit configuration.

  8. Unit 1 enters commercial operation

    Infrastructure

    Calvert Cliffs Unit 1 begins operating, the plant's first pressurized water reactor.

Scenarios

1

Calvert Cliffs uprate wins NRC approval, 190 MW online by 2032

Likely Resolves by End of 2032

Discussed by: Constellation, Baltimore Business Journal, Energy Tech

Constellation expects the 190-megawatt uprate online between 2030 and 2032. It needs NRC approval as an extended power uprate, the largest category, requiring significant equipment modifications. The timeline gives about six years for regulatory review and construction.

2

Constellation commits to small modular reactors at Calvert Cliffs

Possible Resolves by End of 2029

Discussed by: The Banner, Maryland Matters, Southern Maryland Chronicle

Constellation says the Amazon deal gives it revenue certainty to evaluate new small modular nuclear reactors at the site. The company has floated new reactors before. A formal commitment would need years of NRC permitting, so the near-term signal is an announcement, not construction.

3

No new data center for Calvert Cliffs as moratorium lapses

Uncertain Resolves by End of 2027

Discussed by: Southern Maryland Chronicle, Maryland Matters

The county's six-month data center moratorium runs through about February 2027. The new commission is more open to data centers than the ousted one. Constellation says it would consider a large customer only in partnership with the county, and nothing is in the works.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

September 2024

Microsoft funds Three Mile Island restart (2024)

Microsoft and Constellation signed a 20-year power purchase agreement to restart Unit 1 at Pennsylvania's Three Mile Island, shut since 2019. Constellation committed to invest roughly $1.6 billion in the restart, renamed the Crane Clean Energy Center, with a target of online by 2028.

Then

The deal became the template for tech companies funding nuclear power to meet AI data center demand.

Now

It helped spark a wave of nuclear power purchase agreements from Amazon, Google, and Meta.

Why this matters now

Same Constellation and same model: a tech company signs a long-term PPA so the grid gets more clean power, rather than co-locating servers at the plant.

March 2024

Amazon buys Susquehanna data center campus (2024)

Amazon's cloud arm paid about $650 million to acquire a nuclear-powered data center campus at Talen Energy's Susquehanna plant in Pennsylvania, with up to 960 megawatts available. That is the co-location model: the tech giant putting its servers next to the reactor.

Then

The deal showed tech companies' appetite for dedicated nuclear power for data centers.

Now

It also drew scrutiny over whether co-location strains the regional grid by pulling large loads off a small footprint.

Why this matters now

At Calvert Cliffs, Amazon abandoned co-location and instead funded a grid-scale uprate, the opposite approach.

2009-2024

Vogtle expansion (2009-2024)

Georgia Power built the first new US nuclear reactors in over three decades at Plant Vogtle. Originally estimated around $14 billion, the two units cost roughly $35 billion including financing and finished about seven years late, with Unit 3 online in 2023 and Unit 4 in 2024.

Then

Vogtle's cost overruns chilled investor appetite for new large US reactors.

Now

It shifted industry focus to uprates, license renewals, and small modular reactors as cheaper paths to more nuclear power.

Why this matters now

The Calvert Cliffs uprate is a lower-cost alternative to new reactor construction; Constellation's small modular reactor talk reflects where the industry went next.

Sources

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