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Large Load Tariff Tracker 
New  July 23 2025    |    Total  35 Tariffs   39M Customers Served 

Large load tariffs are specialized electricity rate structures designed for customers whose power demand is significantly higher than typical residential, commercial, or small industrial users. These tariffs are used to allocate costs more equitably based on usage, ensure grid stability, and manage the financial risks associated with serving very large, often system-altering, loads—such as data centers, industrial facilities, or other hyperscale users.

Common thresholds for categorizing "large load" customers vary by jurisdiction but typically range from 1 MW to 100 MW or higher. Halcyon’s Large Load Tariff Library allows users to rapidly understand the varied landscape across key dimensions.
 
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Data Center Developers
Understand current and future market conditions to find the most affordable places to build

 

 

Utilities
Follow and analyze approved tariffs nationwide to stay competitive and grow revenue

Policy Analysts
Monitor state-level approaches to attract large industrial loads

Consultants
Identify supply/demand mismatches to inform modeling and cost/benefit analysis

Data Preview (showing 3 of 35 Utilities)

 

Data Methodology

Halcyon’s Large Load Tariff Library allows users to rapidly understand the varied landscape across Utility Data (42 data points), Numeric Data (6 Related Tariff details), and Market Context (A deeper exploration of 14 legislative drivers of the tariff proposals). A detailed list of data items below.

The tracker will be updated on a monthly basis to incorporate new tariffs and back fill those at other entities (large municipalities, cooperatives, federal power authorities) as information is available. Quarterly refreshes will update the full dataset.

Utility Data

Field

Description

Utility

Investor Owned utilities over TK MWh served

DBA

Tradestyle/does business as names of the utility subsidiary or other business unit

State

State this tariff is active in

Docket

Identifier used by state PUC

Docket Name

Name of docket (Petition for approval of "Large load rate")

Status

Flag for whether this docket active/open/ongoing

Tariff Name

Name of plan offered to customers ("Large load rate")

Description (From Docket Profile Page)

Halcyon generated summary of the docket proceedings

Docket Start date

First document publication data

MW Threshold for Data Centers

Megawatt threshold at which the highest load is served for each utility

Voltage Threshold (kV)

Kilovolt threshold at which the highest load is served for each utility

Active date

Start date of tariff for customers

MW threshold for Crypto and/or mobile applications

Megawatt threshold specified for crypto and/or mobile applications (if specified)

Minimum demand threshold / Load Factor

% of maximum load that the facilities has to maintain (if specified)

Long term contract requirements

Duration of contract in years

Rules on Renewals and amendments

Any rules specified in the tariff

Minimum Monthly Demand Payments

Minimum payments (if required)

Exit Fees

Payments required from a developer to a utility if a datacenter does not meet its contractual obligations

Collateral requirements

Posting requirements for

Riders

Riders

Proposed Timeline

The timeline of events proposed by the utility to see a decision on the tariff

List of Commenting Organizations

List of Commenting Organizations

List of Intervenors

List of Intervenors