Utility tariff database

Search 88 US utilities for the rate schedules, demand charges, and large-load tariff provisions used by the calculator. Each row links to the source document and the date the tariff was last verified. Run the calculator to see how a tariff translates into a household bill impact.

Large Load Tariff Database

Comprehensive database of 88 utility tariffs for large loads (1MW+) across the United States. Includes rate structures, protection mechanisms, and regulatory status.

17 High Protection

7 Mid Protection

64 Low Protection

Data Sources: E3 "Tailored for Scale" study (2025), state PUC tariff filings, utility rate schedules, and ISO/RTO interconnection requirements. Last updated January 2026.