Jurisdiction: US — Pennsylvania (PJM)
Three Mile Island Unit 1, Londonderry Township, Dauphin County, Pennsylvania (on the Susquehanna River near Middletown, PA). The restarting unit is TMI Unit 1, distinct from the Unit 2 that was involved in the 1979 accident.
Methodology prs-v0.1 · computed · trigger: manual
Each factor below contributed to the current score. Contributions are rubric weights from methodology prs-v0.1; every factor cites the record it is derived from.
|
Dimension
|
Factor
|
Contribution
|
Cites
|
Narrative
|
|---|---|---|---|---|
| Regulatory | staleness decay | -20 | Crane Clean Energy Center | Newest regulatory evidence is 2025-09-01 (freshness window 9 months) — score drifts one rubric level toward the stage-default prior of 50 (§B.4: silence is information). |
| Capital | baseline | 40 | Crane Clean Energy Center | No committed capital evidenced on any entity role — announcement-only anchor region (§B.2.4). |
| Infrastructure | baseline | 70 | Crane Clean Energy Center | No-adverse-evidence infrastructure baseline (disclosed config, scoring.prs.baselines). |
| Infrastructure | prior use interconnection | +8 | Crane Clean Energy Center | Brownfield site — Retired power plant — inherits an existing energized grid interconnection, materially de-risking the scarcest deliverability bottleneck for a new AI/HPC load (§B.2.3). |
| Infrastructure | staleness decay | -25 | Crane Clean Energy Center | Newest infrastructure evidence is 2025-09-01 (freshness window 9 months) — score drifts one rubric level toward the stage-default prior of 50 (§B.4: silence is information). |
| Regulatory | baseline | 70 | Crane Clean Energy Center | No-adverse-evidence regulatory baseline (disclosed config, scoring.prs.baselines). |
| Schedule | baseline | 80 | Crane Clean Energy Center | No-adverse-evidence schedule baseline (disclosed config, scoring.prs.baselines). |
| Schedule | milestone achieved | +5 | Announcement | Milestone "Announcement" achieved on/ahead of its first announced date (2024-09-20). |
| Schedule | staleness decay | -25 | Crane Clean Energy Center | Newest schedule evidence is 2025-09-01 (freshness window 6 months) — score drifts one rubric level toward the stage-default prior of 50 (§B.4: silence is information). |
Energization · Expected:
Announcement · Actual:
Utility approval
No active constraint observations recorded against this project.
|
Entity
|
Role
|
Ownership
|
Committed capital
|
|---|---|---|---|
| Microsoft | — | — | |
| Constellation Energy | — | — | |
| PJM Interconnection | — | — |
Every substantive field on this record is backed by a canonical claim from a cited source document, graded on the E1 (strongest) – E5 (weakest) evidence ladder.
Constellation Energy · Sep 20, 2024 · backs: actual date, capacity mw
https://www.constellationenergy.com/news/2024/Constellation-to-Launch-Crane-Clean-Energy-Center-Restoring-Jobs-and-Carbon-Free-Power-to-The-Grid.html
Constellation Energy · Sep 1, 2025 · backs: expected date, status
https://www.constellationenergy.com/news/2025/09/one-year-later-crane-clean-energy-center-still-in-the-spotlight-and-ahead-of-schedule.html
Utility Dive · Sep 20, 2024 · backs: capex usd
https://www.utilitydive.com/news/constellation-three-mile-island-nuclear-power-plant-microsoft-data-center-ppa/727652/
Recent ingested source documents linked to this project via extracted claims or triage mentions, newest first.
· Constellation Energy
· Constellation Energy
· Utility Dive