Large-Load (Data Center) Electric Cost-Allocation Tariffs: 50-State Survey

PENDING

• PG&E's Electric Rule 30 uniform transmission-interconnection tariff (A.24-11-007) has only interim approval requiring up-front payment; the final decision and refund cost-allocation remain pending.^[1]
• SB 886 would require a dedicated data-center tariff at 25 MW, with full cost responsibility for interconnection upgrades, a 15-year zero-carbon energy contract, and an exit fee.^[2]
• An April 2026 CPUC rate-design rulemaking (implementing SB 57) is examining dedicated tariffs and demand charges for data centers; SB 57 itself directs only a study, due Jan. 1, 2027.^[3]
• Separately, the Imperial Irrigation District (public power) has a Large Load Tariff Schedule.^[4]
• Next expected action: CPUC final decision on PG&E Electric Rule 30 (A.24-11-007, now interim); SB 57 data-center rate-design study due January 1, 2027; SB 886 pending in the Legislature.^[5]

Sources

[1] ('CPUC Weighs Cost Recovery for Interconnection...', by Seth Hilton, Lilly McKenna, Sam Wong, Stoel Rives LLP, Published By JD Supra; 'CPUC Weighs Cost Recovery for Interconnection...', by Seth Hilton, Lilly McKenna, Sam Wong, Stoel Rives LLP, Published By JD Supra)

[2] ('California bills and federal actions focus on...', by Gwen Keyes Fleming, Andrew Brady, Caroline Lee, Katrina Tomecek, DLA Piper, Published By JD Supra)

[3] ('CPUC Will Address Electric Rate Impacts of Data...', by Louise Dyble, Hanson Bridgett, Published By JD Supra; 'California Governor Vetoes Proposed Data Center...', by Alexander Ames, Christopher Powell, Hanson Bridgett, Published By JD Supra)

[4] (DELTa: Database of Emerging Large Load Tariffs at 13)

[5] ('CPUC Weighs Cost Recovery for Interconnection...', by Seth Hilton, Lilly McKenna, Sam Wong, Stoel Rives LLP, Published By JD Supra; 'California Governor Vetoes Proposed Data Center...', by Alexander Ames, Christopher Powell, Hanson Bridgett, Published By JD Supra)

Back to Top

APPROVED + PENDING

• Approved (1): Black Hills Colorado Electric's Economic Development Rate (Proceeding 25A-0500E, C26-0229, April 2026, affirmed C26-0345) — a 10% discount floored at marginal cost, 60 MW cap, with an express commitment that retail customers are not assigned transmission/distribution interconnection or construction costs.^[1]
• Approved (2): Public Service Company's customer-specific QTS Aurora data-center contract (Proceeding 23A-0330E, 2024) — QTS pays 100% of customer-funded transmission (~$28.1M), $1.06M security, 10-year term with clawback.^[2]
• Pending: Public Service's Schedule TL / Large Load Tariff (Docket 26AL-0137E) was suspended and set for en banc hearing by Decision C26-0280 (April 30, 2026) — not approved. It applies to load 50 MW or more, socializes network-transmission reinforcements across the Schedule TL class while direct-assigning customer-specific interconnection facilities, with an 80% minimum bill and 15-year term.^[3]
• Other: two 2026 bills (SB26-102, HB26-1030) failed, and Tri-State's wholesale High Impact Load Tariff was rejected by FERC.^[4]
• Next expected action: En banc hearing on Public Service's Schedule TL (Docket 26AL-0137E), set by Decision C26-0280 (April 30, 2026); the tariff is suspended pending that hearing, the date of which is not stated in the located sources.^[5]

Sources

[1] (In the Matter of the Application of Black Hills Colorado Elec., LLC, for Approval of Its Econ. Dev. Tariff (Edr)., No. 25A-0500E, 2026 WL 1603172 (May 27, 2026); In the Matter of the Application of Black Hills Colorado Elec., LLC, for Approval of Its Econ. Dev. Tariff (Edr)., No. 25A-0500E, 2026 WL 1031938 (Apr. 13, 2026); In the Matter of the Application of Black Hills Colorado Elec., LLC, for Approval of Its Econ. Dev. Tariff (Edr)., No. 25A-0500E, 2026 WL 1031938 (Apr. 13, 2026))

[2] (IN THE MATTER OF APPLICATION OF PUBLIC SERVICE COMPANY OF COLORADO FOR APPROVAL OF A NON-STANDARD EDR CONTRACT, AND FOR DETERMINATION NO CPCN IS NEEDED FOR CUSTOMER-FUNDED TRANSMISSION FACILITIES., No. R24-0168, 23A-0330E, 2024 WL 1236962; IN THE MATTER OF APPLICATION OF PUBLIC SERVICE COMPANY OF COLORADO FOR APPROVAL OF A NON-STANDARD EDR CONTRACT, AND FOR DETERMINATION NO CPCN IS NEEDED FOR CUSTOMER-FUNDED TRANSMISSION FACILITIES., No. R24-0168, 23A-0330E, 2024 WL 1236962; IN THE MATTER OF APPLICATION OF PUBLIC SERVICE COMPANY OF COLORADO FOR APPROVAL OF A NON-STANDARD EDR CONTRACT, AND FOR DETERMINATION NO CPCN IS NEEDED FOR CUSTOMER-FUNDED TRANSMISSION FACILITIES., No. R24-0168, 23A-0330E, 2024 WL 1236962)

[3] (IN THE MATTER OF ADVICE LETTER NO. 2018 - ELECTRIC FILED BY PUBLIC SERVICE COMPANY OF COLORADO TO REVISE COLORADO P.U.C. NO. 8 - ELECTRIC TARIFF TO ADDRESS LARGE LOADS, ADD A NEW SCHEDULE TRANSMISSION LARGE SERVICE (SCHEDULE TL) RATE, ADD A NEW CLEAN TRANSITION TARIFF (SCHEDULE CTT), AND IMPLEMENT CHANGES TO THE TRANSMISSION LINE EXTENSION POLICY, TO BECOME EFFECTIVE MAY 3, 2026., No. 26AL-0137E, C26-0280, 2026 WL 1282969; IN THE MATTER OF ADVICE LETTER NO. 2018 - ELECTRIC FILED BY PUBLIC SERVICE COMPANY OF COLORADO TO REVISE COLORADO P.U.C. NO. 8 - ELECTRIC TARIFF TO ADDRESS LARGE LOADS, ADD A NEW SCHEDULE TRANSMISSION LARGE SERVICE (SCHEDULE TL) RATE, ADD A NEW CLEAN TRANSITION TARIFF (SCHEDULE CTT), AND IMPLEMENT CHANGES TO THE TRANSMISSION LINE EXTENSION POLICY, TO BECOME EFFECTIVE MAY 3, 2026., No. 26AL-0137E, C26-0280, 2026 WL 1282969)

[4] (Tri-State Generation & Transmission Ass'n, Inc., 193 FERC ¶ 61,070, 2025 WL 3127637 (2025))

[5] (IN THE MATTER OF ADVICE LETTER NO. 2018 - ELECTRIC FILED BY PUBLIC SERVICE COMPANY OF COLORADO TO REVISE COLORADO P.U.C. NO. 8 - ELECTRIC TARIFF TO ADDRESS LARGE LOADS, ADD A NEW SCHEDULE TRANSMISSION LARGE SERVICE (SCHEDULE TL) RATE, ADD A NEW CLEAN TRANSITION TARIFF (SCHEDULE CTT), AND IMPLEMENT CHANGES TO THE TRANSMISSION LINE EXTENSION POLICY, TO BECOME EFFECTIVE MAY 3, 2026., No. 26AL-0137E, C26-0280, 2026 WL 1282969)

Back to Top

APPROVED + PENDING

• Approved: the Florida PSC approved Large Load Contract Service tariffs (Final Order PSC-02026-0022-S-EI, Jan. 22, 2026), and SB 484 (eff. July 1, 2026) defines a "large load customer" at 50 MW and requires each to bear its full cost of service.^[1]
• Pending: Duke Energy Florida's proposed Large Load Customer class and LLC-1 rate schedule (Large Load Policy at 100 MW, with minimum term, minimum bill, security, early-termination, system-impact fee, and CIAC up to 100%) was suspended pending review in Docket 20250113-EI (Oct. 14, 2025).^[2]
• Next expected action: Florida PSC review of Duke Energy Florida's suspended LLC-1 schedule (Docket 20250113-EI); SB 484 took effect July 1, 2026. No hearing date for the Duke schedule is stated in the located sources.^[3]

Sources

[1] ('Florida Senate Bill 484: Revisions To Regulations...', by Kenneth Tinkler, Carlton Fields, Published By JD Supra; 'Proposed Florida Legislation Creates New Regulatory...', by D. Bruce May, Blaine Remmick, Holland & Knight LLP, Published By JD Supra)

[2] (In Re: Petition for A Ltd. Proceeding to Approve Large Load Tariff, by Duke Energy Fla., LLC., No. 20250113-EI, 2025 WL 2948054 (Oct. 14, 2025))

[3] (In Re: Petition for A Ltd. Proceeding to Approve Large Load Tariff, by Duke Energy Fla., LLC., No. 20250113-EI, 2025 WL 2948054 (Oct. 14, 2025); 'Proposed Florida Legislation Creates New Regulatory...', by D. Bruce May, Blaine Remmick, Holland & Knight LLP, Published By JD Supra)

Back to Top