Southwest Power Pool region (multistate)

Southwest Power Pool: High Impact Large Load study processes accepted by FERC (ER26-247)

Enacted legislation or regulation

In effect This instrument is recorded as currently in effect as of the dataset date.

Summary

On 14 January 2026 the Federal Energy Regulatory Commission accepted Southwest Power Pool tariff revisions, effective 15 January 2026, that add a High Impact Large Load study process and a generation assessment for those loads. The order records that SPP cited a surge in large-load requests from data centers and others. A later order on 9 March 2026 accepted the corrections the Commission had directed. The revisions are to SPP's regional tariff and do not approve any particular project.

Scope

Federal Energy Regulatory Commission order 194 FERC ¶ 61,031 (Docket ER26-247-000) accepts, effective 15 January 2026 and subject to condition, Southwest Power Pool tariff revisions that add a High Impact Large Load study process and a High Impact Large Load Generation Assessment. The tariff definition covers a new or increased commercial or industrial load at a single site of 10 MW or more at 69 kV or below, or 50 MW or more above 69 kV. It sets study and operating requirements for those loads and does not by itself approve any project.

Geographic scope
Southwest Power Pool region (multistate)
Coverage
17 jurisdictions listed, 17 only in part
Jurisdiction
Regional grid
Authority type
Regulator or commission
Issuing authority
Federal Energy Regulatory Commission

Covered jurisdictions

This instrument is stored once. It appears on the policy page of each jurisdiction below in a separate federal and multistate section and is not counted in any jurisdiction's own records, in-effect totals or map shading. Territorial coverage does not establish that an instrument applies to any particular site, utility or project.

How this list was set, checked 3 November 2026: Southwest Power Pool says it serves members in all or part of 17 states, and its Regional State Committee page names commissions from 17 states, which are the states listed here. SPP does not say which are covered only in part, so every listed state is marked as covered in part; that is not a finding that any of them is not wholly covered. The list describes the SPP region as of October 2026, after its April 2026 expansion into the Western Interconnection. Coverage source

Dates

Adopted
14 January 2026
Effective
15 January 2026
Scheduled expiration
No expiration date recorded
Ended
Not recorded as ended
Completion condition
None stated
Source document
14 January 2026
Last checked
3 November 2026

What this does not establish

  • The Commission's order names no list of states. The coverage list comes from SPP's own description of its region and does not establish that the tariff applies to any particular site, utility or project. The order also predates the April 2026 expansion of the SPP region.
  • The tariff text itself was not opened; the provisions are described from the Commission's orders.
  • SPP's High Impact Large Load web page still called these proposed solutions when checked on 3 November 2026. The Commission's order is the controlling record here.

Unresolved questions

None recorded.

Relationships

Supersession means a later instrument replaces the earlier legal effect. Repeal links identify the repeal instrument and the measure it ends. A later implementation or related letter is not treated as a replacement unless the record says so.

Sources

Primary source: Federal Energy Regulatory Commission page on spp.org

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