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Power · Evidence brief

Microsoft anchors Three Mile Island Unit 1 restart

Microsoft + Constellation

Primary sourcePress release only2024-09-20
Deal structure20-year nuclear power purchase agreement
GeographyPennsylvania / PJM
Infrastructure layersPower + data centers
Disclosed scaleApprox. 835 MW carbon-free output from restarted TMI Unit 1 / Crane Clean Energy Center

Why it matters

The strategic read

A landmark AI-era nuclear restart: data-center demand became credit support for bringing retired firm clean capacity back to the grid.

Source-supported terms

What was disclosed

  1. 01

    Constellation signed its largest-ever PPA with Microsoft to restart Three Mile Island Unit 1 as the Crane Clean Energy Center.

  2. 02

    The 20-year PPA supports approximately 835 MW of carbon-free power added back to the grid.

  3. 03

    Microsoft will purchase energy as part of matching its PJM data-center electricity use with carbon-free energy.

Disclosure boundary

What is known—and what is not

Primary announcement; full PPA economics and settlement terms not public.