Power project
Crane Clean Energy Center restart
Londonderry Township, Pennsylvania · Generation
Restart preparations
Constellation reported interconnection-rights and fuel-license progress in August 2026, with restart still targeted for 2027.
Former Three Mile Island Unit 1. The Microsoft agreement is a power-purchase contract; this is not a claim the plant is already generating or is a dedicated on-site data-center supply.
Last documented milestone:
Sources checked: September 7, 2026
- Developer / operator
- Constellation
- Technology
- Nuclear restart
What the equipment is rated to do
Capacity is not annual energy output or guaranteed availability. MW and MWh describe different quantities.
The documented hurdles
- Grid connection / market accessHistorical hurdle
The operator reports that a waiver addressed a capacity-interconnection-rights requirement.
- Permitting / licensingFurther steps required
Restart remains a future milestone despite the reported licensing progress.
The dated trail
Restart plan and power contract announced
Constellation announced a 20-year agreement with Microsoft supporting the proposed restart.
Connection and licensing milestones reported
The operator reports a FERC waiver to transfer capacity interconnection rights and an NRC fuel-license amendment; it still targets 2027 operation.
Open the supporting records
1. Operator announcement · Constellation
Crane restart and Microsoft power-purchase agreement
A power-purchase agreement is not a dedicated physical wire to a particular data center; restart remained conditional.
Publication: 2024-09-20 · Checked: 2026-09-07
Source record: crane-restart-plan
Location in source: Restart scope, approximately 835 MW and 20-year Microsoft agreement2. Operator financial release · Constellation
Crane restart: interconnection and fuel-license milestones
Reports regulatory milestones and a 2027 restart target, not operating output or a guarantee of completion.
Publication: 2026-08-06 · Checked: 2026-09-07
Source record: crane-2026-update
Location in source: Recent Developments: Crane Clean Energy Center paragraph