Michigan Data Center Power Rules: Large-Load Tariffs and State Law

Utilities

Michigan utilities and their large-load rules.

• Indiana Michigan Power

  IN, MI · PJM · AEP

  ●ApprovedFeb 2025

  Large load tariff settlement (IURC Cause No. 46097)

  Indiana regulators approved terms requiring large new I&M customers to sign 12-year contracts and pay for at least 80% of contracted demand.

  • Applies to: 70 MW+ at one site or 150 MW+ in aggregate
  • 12-year minimum contract
  • Pays at least 80% of contracted demand each month
  • Higher collateral requirements
  • Exit fee capped at five years of minimum charges
  • Planned cuts of more than 20% of contracted capacity need regulator review

  Sources: Renewable Energy World, Midwest utility gets regulatory approval for large load tariff settlement (2025); American Electric Power, Indiana Michigan Power Receives Order in Large Load Settlement (2025); Utility Dive, Indiana Regulators Approve Large Load Interconnection Settlement With AEP, Amazon, Google (2025)

• Consumers Energy

  MI · MISO · CMS Energy

  ●ApprovedNov 2025

  Large data center terms of service (Case U-21859)

  Michigan regulators approved Consumers Energy terms requiring data centers of 100 MW or more to sign 15-year contracts with an 80% minimum bill.

  • Applies to: 100 MW+, or 100 MW aggregated across sites of 20 MW+ under common ownership
  • 15-year minimum contract
  • Pays at least 80% of contracted demand
  • Ramp period of up to five years
  • $100,000 project proposal fee
  • Collateral equal to half the exit fee, as cash or letter of credit

  Sources: Michigan Public Service Commission, MPSC approves terms of service between Consumers Energy and data centers (2025); Varnum LLP, MPSC Approves Consumers Energy Tariff for Large Data Centers (2025)

• DTE Electric

  MI · MISO · DTE Energy

  ◌In reviewDec 2025

  Very large load tariff (Case U-22061); Saline Township special contracts approved

  Michigan approved DTE's special contracts for a 1,383 MW campus and ordered a general very-large-load tariff, which was still in review.

  • Approved special contracts: 19-year minimum term
  • Approved special contracts: pays at least 80% of contracted demand
  • Termination payment of up to 10 years of minimum bills
  • Data center load reduced before other customers in an emergency

  Sources: Michigan Public Service Commission, MPSC approves DTE Electric energy contracts for data center (2025); T&D World, Michigan Regulators Approve DTE Data Center Power Contracts with Added Ratepayer Protections (2025); Earthjustice, Michigan's Public Service Commission Grapples with AI Data Center Load (2026)