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Large Load Tariff Tracker
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State-level market intelligence on how utilities are engaging with data centers and other large load customers
LAST UPDATED *
Mar 13, 2026
RECENT UPDATES
3 new tariffs,
6 new proceedings,
3 new column added
TOTALS
132 tariffs covering data centers, telecom infra, and crypto-miners
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| Utility | Name | Type | Regulatory Body | Parent | DBA | EIA Utility ID | State | BA Code | Total Megawatt Hour Sales | Utility Customer Count | Docket Number | Halcyon Docket Profile | Docket Name | Docket Status | Description | Docket Start Date | Proposal Date | Active Date | Status | Update Type | Revisions | Filing Link | Qualifying Demand Threshold (MW) | Voltage Threshold (kV) | MW Threshold for Crypto and/or Mobile Applications | Minimum Load Factor | Long Term Contract Years | Ramp Period | Long Term Contract Requirements | Rules on Renewals and Amendments | Minimum Monthly Demand Payments Flag | Minimum Monthly Demand Payments Details | Contribution in Aid of Construction (CIAC) Flag | Contribution in Aid of Construction (CIAC) Details | Exit Fee Details | Exit Fee Time Period (Months) | Collateral Requirements Details | Collateral Requirements Calculation | Collateral Calculation Method | Study Requirements | Riders | Pre-Existing Tariffs | Recent Legislative Driver (TRUE / FALSE) | Legislation Details | Load Flexibility Flag | Load Flexibility Details | Behind-the-Meter / Co-Located Resources | Offsite Dedicated Resources | Expedited Interconnection / Fast Lane Flag | Expedited Interconnection / Fast Lane Details | Time to Power | Power Factor % | Power Factor Details | Timeline | Number of Comments |
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| Union Electric Company | Large Load Customer Service (LLCS) | Tariff | Missouri Public Service Commission | Ameren | Ameren Missouri | 19436 | MO | MISO | 30,764,248 | 1,264,469 | ET-2025-0184 | https://app.halcyon.io/processes/b43b1c01-62be-40a2-9cdb-013f755400f4 | In the Matter of the Application of Union Electric Company d/b/a Ameren Missouri for Approval of New Modified Tariffs for Service to Large Load Customers | Open/Active | The LLCS program creates a new tariffed Large Load Customer Service allowing very large customers (≥75 MW peak or expansions adding ≥75 MW) to take service under long-term written service agreements that include contract capacity, ramp periods, and automatic five-year extensions. It offers optional renewable energy subscriptions (RSP-LLC), clean capacity... | Dec 12, 2024 | May 14, 2025 | Dec 4, 2025 | Confirmed | New | - | https://app.halcyon.io/documents/9f478bcc-bdc5-4504-b98c-00b69154395c/attachment | 75 | 115 | - | 75% | 15 | 5 | Large load customers shall enter into one or more electric service agreements (ESAs). The term equals the ramp period plus at least twelve years after the end of the ramp period such that the total is at least fifteen years; the ramp period may be up to five years. | - | Yes | 80% of contracted capacity | Yes | Prospective LLCS customers must prepay estimated construction costs for transmission extensions and all appurtenant facilities; customers are responsible for nonrefundable charges for infrastructure that would not have been constructed but-for their service and for refundable charges that may be reimbursed during the five years following completion. Refunds to initial funding... | If a data center (large load customer) terminates its contract early, it must provide 24 months' written notice and pay substantial termination payments. These payments are calculated as follows: - During the ramp period: Payment covers all minimum demand charges for the remainder of the ramp period. - After the ramp period: Payment covers the lesser of five years... |
Lesser of five years or remaining months |
Customers must meet certain credit ratings (at or above A- from S&P Global Ratings and A3 from Moody's) and liquidity requirements (10x 50% of the customer's minimum capacity and clean energy commitments for remaining term of service), or else post collateral such as cash, a letter of credit, or a guaranty from a creditworthy affiliate. The required collateral is based on the... | Minimum non-fuel bill for remaining months | Minimum demand charge | - | - Renewable Solutions Program – Large Load Customers (Rider RSP-LLC) - Clean Capacity Advancement Program (Rider CCAP) - Nuclear Energy Credits (Rider NEC) - Clean Energy Choice (Rider CEC) 2. |
Large load customers (100 MW or more) would be served under the existing Large Primary Service (LPS) tariff, specifically within a new subclass of the LPS tariff that would be subject to new terms and conditions only for large load customers. The LPS tariff reflects the embedded cost of service and applies to large retail customers prior to the establishment of a specialized large load... | True | The proposal is directly driven by recently enacted legislation—specifically, Missouri Senate Bill 4 (SB 4). SB 4 requires that electric utilities serving more than 250,000 customers develop and submit tariff schedules for customers projected to have annual peak demands of 100 MW or more. The legislation mandates that rates for such customers reflect their representative share of incurred... | Not Required | - Large load customers must not exceed their maximum contract capacity; if they do and such exceedance threatens system integrity or reliability, they are required to reduce load to or below the maximum capacity within 15 minutes of notice from the company. - There is no explicit mention of penalties for failing to shed load... |
- | Customers are given the option to take part in the Renewable Solutions Program, which allows them to subscribe to their preferred wind and/or solar resources, as well as the Nuclear Energy Credit Program, which provides customers with ownership of nuclear energy credits associated with the Company's own nuclear generation. | No | - | Utilities face challenge of "building enough generation in a timely manner to provide capacity and energy to reliably serve all customers while meeting the timelines for ramping up to full demand that the new customers desire." No specific numeric time-to-power or speed-to-power for new applications under LPS is provided. | - | - | - May 14: Application and testimony were due. - June 13: The Commission scheduled a prehearing Webex procedural conference. - June 23: Deadline for parties to file a proposed procedural schedule and for Ameren Missouri to respond to Evergy Metro and West’s intervention request... |
7 |
| AEP Ohio | Schedule DCT (Data Center Tariff) | Tariff | Public Utilities Commission of Ohio | American Electric Power (AEP) | - | 14006 | OH | PJM | 44,314,671 | 1,523,794 | 24-0508-EL-ATA | https://app.halcyon.io/processes/f86744b3-4727-49ef-a830-591988aee2f6 | ATA-Application for tariff approval | Open/Active | The docket concerns AEP Ohio's proposal to create a new customer classification and tariff structure specifically for large data centers. Key issues addressed include: - AEP Ohio’s request for new tariff terms for large loads, especially data centers, proposing requirements such as long-term contracts, minimum demand provisions, exit fees, and higher... |
May 13, 2024 | May 13, 2024 | Jul 23, 2025 | Confirmed | New | - | https://app.halcyon.io/documents/c6a05869-c40b-4e51-a77b-2e6968c8c97d/attachment | 25 | - | 25 | 85% | 8 | 4 | 8 years plus a 4 year maximum load ramp allowed. Load ramp as minimum % of final capacity is defined | Contracts remain in effect unless terminated by either party with written notice no less than 3 years prior to termination date. New contracts required fo rload additions in excess of 100kW. | Yes | The greater of 85% of highest previously established monthly billing demand over prior 11 months, or customer's Minimum Demand calculation based on named capacity, with some variation for capacity between 25MW and 75MW, and above 75MW. | Yes | The schedule states that a customer must sign a letter of agreement for network and customer-specific investment prior to energization or a contribution in aid of construction agreement for customer-specific investment. Collateral and financial-security requirements (guarantee or collateral equal to 50% of total minimum charges for the full term if credit/liquidity thresholds not... | Exit fee equal to three years of minimum charges if the customer terminates after five years following the load ramp period. Early termination is prohibited during the first five years after the load ramp period. The exit fee is credited for the benefit of ratepayers. Customers may assign up to 25% of contract capacity to another data center customer in lieu of paying some or all of the exit fee.... | 36 | Data centers (or their financial sponsor) with credit ratings below A- from S&P or A3 from Moody’s are required to provide either a parent company guarantee or collateral such as a letter of credit or cash. The security must equal 50% of the minimum demand charge for the full contract term, based on AEP Ohio’s rates at the time the electric service agreement is signed. Acceptable forms... | 50% minimun demand charge for contract period | Minimum demand charge | Under the approved stipulation process, customers must first submit a request and pay a one-time load study fee ranging from $10,000 to $100,000, depending on the scale and complexity of the request. These studies are completed in-house by AEP Ohio’s transmission planning team rather than being outsourced to third-party engineers. The process includes a second step where AEP... | Monthly charges computed under Schedule DCT are adjusted in accordance with commission-approved riders on sheet number 104-1 that apply to demand metered commercial and industrial service. Nothing in this tariff excepts eligible customers from other riders or applicable tariffs. | - The primary pre-existing tariff for large loads is Ohio Power's General Service (GS) tariff, under which customers enter into one-year electric service contracts, though Ohio Power has the option to require a longer initial term. The GS tariff requires contracts to specify a 'contract capacity' (the maximum power delivered to the customer) and imposes a minimum demand charge set at 60% of... | False | The process motivating these tariffs is rooted in regulatory proceedings before the Public Utilities Commission of Ohio, rather than any specific new legislation. The cited statutes (e.g., R.C. 4903.221) pertain to intervention rights in commission proceedings, not direct legislative mandates for the tariff itself | Required for BTM Generation | The Schedule DCT/MDC/FLT materials include terms requiring customers with behind-the-meter generation to have equipment that can "instantaneously curtail load equal to or greater than the behind - the - meter generation output" and require customers to attest they will follow applicable technical operating requirements (including not cycling load in a way that creates unacceptable... | Schedule DCT allows customers the right to net behind-the-meter generation (onsite generation) against contract capacity, provided certain conditions are met. | - | No | - | Schedule DCT allows for a load ramp period of up to four years, commencing upon energization, to reach full contract capacity. There is also a provision allowing customers to petition the commission for adjustment if electric infrastructure is not in place by the estimated in-service date | - | - | - May 13, 2024: AEP Ohio filed its application to establish new tariffs for data centers and mobile data centers (cryptocurrency miners). - June & July 2024: Multiple parties, including Walmart, intervened and filed initial and reply comments. - July 11, 2024: The Public Utilities Commission of Ohio... |
203 |
| Appalachian Power Company | Schedule L.P.S. (Large Power Service) | Tariff | Virginia State Corporation Commission | American Electric Power (AEP) | - | 733 | VA | PJM | 14,307,492 | 549,270 | PUR-2025-00057 | https://app.halcyon.io/processes/9f42cb63-d33c-49bf-b952-55ebd7bb2ada | Appalachian Power Company - Petition for approval of Revisions to the Terms and Conditions of Rate Schedules L.P.S. | Open/Active | Appalachian Power Company proposed significant revisions to its existing Schedule L.P.S. (Large Power Service) tariff for new large load customers, such as data centers, involving loads greater than or equal to 100 MW at an individual site or 150 MW on an aggregated basis. The proposed changes include a 12-year initial contract term, a five-year notice period to discontinue or modify... | Mar 24, 2025 | Mar 24, 2025 | - | Anticipated | Revision | Revises terms and conditions of existing Schedule L.P.S. to add specific large-load provisions: increases initial contract term to 12 years (after any ramp period), allows a load ramp period up to 5 years, raises enhanced requirements for new/expanded large loads (≥100 MW single site or ≥150 MW aggregated), clarifies 42-month notice timing so termination/reduction cannot take effect until 8.5... | https://app.halcyon.io/documents/7bc6533c-d181-4bf6-8652-177f2da5eea3/attachment?page=29 | 100 | - | 100 | - | 12 | 5 | New large load customers (over 100 MW at a site or 150 MW aggregated) must enter into a contract with an initial term of at least 12 years, which begins after an optional ramp period of up to 5 years. The contract includes requirements for a minimum billing demand, collateral, and an exit fee for early termination. | After the initial 12-year term (plus any ramp period), contracts remain in effect until cancelled or modified according to the tariff terms. Customers must provide at least 42 months' written notice to reduce capacity or terminate the contract, but may not do so during the first 5 years of the initial term. Amendments or reductions in capacity are limited to after the first 5 years, with a... | Yes | The customer is subject to a minimum monthly charge equal to the sum of the basic service charge, the product of the demand charge and the monthly billing demand, all applicable adjustments, and the product of the base billing energy and the monthly base energy charge. The monthly billing demand is not less than 80% of the greater of the customer's on-peak contract capacity or... | Conditional | Schedule L.P.S. does not fully address upstream transmission upgrade costs in its current line extension policy; the company can impose contribution in aid of construction or an advance-and-refund line extension agreement to recover costs upfront if it deems appropriate, but the tariff as described assesses only local facility costs and does not indicate that upstream/network... | A large load customer may terminate or reduce its contract capacity beyond 20% (after the first five years of the initial contract term) by giving at least 42 months' written notice prior to the PJM delivery year for which the reduction/termination is sought, subject to payment of an exit fee. The exit fee is calculated as the nominal value of the remaining minimum charge for the... | Lesser of five years or remaining months but not less than one year | Customer must provide collateral in a form acceptable to the company based on creditworthiness. The amount is equal to 24 times the customer's previous maximum monthly non-fuel bill (or for the first year, the maximum expected bill). This is recomputed annually and updated if the value increases by 10% or more. | 24 months of maximum non-fuel bill | Maximum non-fuel bill | - | Each kilowatt-hour of energy and each kilowatt of demand billed is subject to all applicable riders and surcharges, in addition to base rates and demand charges. | - Schedule L.P.S. (Large Power Service): Large loads would be served under Appalachian Power Company's existing Schedule L.P.S. This tariff is available to customers with large loads and was deemed sufficient for high load factor customers, including data centers, prior to the proposed modifications. The main distinction between the proposed changes and the pre-existing tariff relates... | False | APCo proposed revisions to its existing 'Schedule L.P.S. (Large Power Service)' to address new large load customers (e.g., data centers) with aggregated loads of 150 MW or more, or 100 MW at an individual site. The proposal was made pursuant to sections 56-236 and 56-237 of the Code of Virginia. The motivating factors include the growing interest from very large load customers and... | Not Required | - | All other customers having sources of electrical energy supply other than the Company shall take service under Schedule S.B.S. | Customers with cogeneration and/or small power production facilities shall take service under Schedule COGEN/SPP or by special agreement with the Company. All other customers having sources of electrical energy supply other than the Company shall take service under Schedule S.B.S. | No | - | - | - | - | - March 24, 2025: Appalachian Power Company (APCo) files a petition with the Virginia State Corporation Commission (SCC) for approval of revisions to the terms and conditions of Rate Schedule L.P.S. (Large Power Service), applicable to new large load customers (≥100 MW at a site or ≥150 MW aggregated). No new 'Schedule K.P.S.' is proposed; the revisions are to existing... | 30 |
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