Curated reference and analysis. Last full review: July 9, 2026
Verify all figures against ISO sources before relying on them for project decisions.
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U.S. ISO / RTO Large-Load Positioning
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Exhibit 2 · Project signal

Amazon AWS Rainier (Project Rainier)

Data Center · Under Construction
ISO/RTO:PJMConfidence:High
Status
Under Construction
State
IN
County
St. Joseph County
Nearest city
New Carlisle
ISO / RTO
PJM Interconnection
Utility
Indiana Michigan Power (AEP)
Developer / owner
Amazon Web Services; compute for Anthropic
Estimated load
2,200 MW
Estimated generation
Not disclosed
Reported capex (as cited)
Multi-billion, part of Amazon's large Indiana investment
Announced
2024
Expected COD
Phased; partial operation underway
Public summary
A large AWS campus near New Carlisle running training and inference for Anthropic. Crossed 1 GW of facility power January 2026 (Epoch AI); Anthropic's primary training campus. Seven data centers operate of roughly 30 planned, drawing about 2.2 GW at full build.
Grid relevance
The clearest one-tenant PJM-footprint gigawatt campus. State officials opened an inquiry into whether construction dewatering dried local wells, showing water and community impact becoming a constraint alongside power.
Last updated
2026-06-17
Sources
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