Interconnection queue guide · SPP

SPP interconnection queue

How the DISIS cluster studies, the expedited ERAS round and the new Consolidated Planning Process fit together, and what the public queue record shows at individual points of interconnection.

GridVision AI ResearchPublished September 16, 2026Updated September 16, 2026

SPP at a glance

Cluster process: Definitive Interconnection System Impact Study (DISIS): an 11-month queue cluster window and a one-month review period, then Phase One, Decision Point 1, Phase Two and Decision Point 2.
Current DISIS cluster: DISIS-2024-001: 120 projects and 35,436 MW, with Phase Two in progress on SPP's schedule revised August 21, 2026.
Expedited Resource Adequacy Study (ERAS): A one-time expedited study for projects nominated by load-responsible entities. ERAS-2025-001 lists 36 projects and 13,278 MW, with interconnection agreements in progress.
Consolidated Planning Process: Approved by FERC on March 13, 2026, effective March 1, 2026. SPP's first application window opened in April 2026 and is listed as open on the August 21, 2026 schedule.
Backlog: In September 2025, SPP reported 24 cluster studies completed since 2022, covering 1,652 projects and 340 GW of generation.
Study time: SPP says its average study time is already down to 18 months and anticipates about seven months under the new process, with full implementation beginning in 2027.

Sources: SPP Tariff Attachment V, Generator Interconnection Procedures; SPP Generator Interconnection study schedule, revised August 21, 2026; SPP news release, “SPP board approves expedited generation interconnection process,” May 8, 2025; SPP news release, “FERC approves SPP’s groundbreaking transmission planning proposal,” March 16, 2026; SPP news release, “Southwest Power Pool reaches milestone in acceleration of generation interconnection requests,” September 10, 2025; SPP news release, “SPP Consolidated Planning Process to reduce costs and help meet nation’s growing energy needs,” August 5, 2025.

Facts checked September 16, 2026.

How the SPP process works

SPP's DISIS cluster studies follow this sequence under Attachment V:

01DISIS queue cluster window11 calendar months.
02DISIS review periodOne calendar month.
03Phase OneWithin 60 calendar days after the review period closes.
04Decision Point 1
05Phase TwoWithin 120 calendar days after Decision Point 1 ends.
06Decision Point 2Followed by the remaining steps to an interconnection agreement.

Under the Consolidated Planning Process, SPP's Interconnection Cluster Study is due no later than 180 calendar days after its review period closes, followed by a 20-business-day decision point. The governing tariff controls any live project.

Sources: SPP Tariff Attachment V, Generator Interconnection Procedures; SPP compliance filing implementing the Consolidated Planning Process tariff revisions, April 13, 2026.

What the public record shows at SPP points of interconnection

Across the 3 SPP points of interconnection GridVision has published so far, the Berkeley Lab dataset records 17 interconnection requests filed between 2006 and 2021.

Outcomes of interconnection requests at the published SPP points of interconnection
Outcome	Requests	Capacity (MW)
Reached commercial operation	8	1,173
Withdrew	7	1,257
Still active	2	341
Total	17	2,770

For the requests that were built, the median time from request to commercial operation was 4.5 years. For those that withdrew, the median time from request to withdrawal was 0.5 years.

These 3 nodes are not a random sample of SPP, and a pattern at one point of interconnection does not transfer to another. The dataset records what happened, not why.

Published SPP point-of-interconnection retrospectives
Point of interconnection	State	Requests	Built	Withdrawn	Active
Sweetwater 230 kV	Oklahoma	5	4	1	0
Woodward EHV 345 kV	Oklahoma	5	1	2	2
TUCO 345 kV	Texas	7	3	4	0

Questions to answer before advancing a SPP queue position

Which process is the project in (DISIS, ERAS or the Consolidated Planning Process), and which rules govern its next decision point?
What do your Phase One or Phase Two results assume about other requests in the same cluster?
What is at risk if you continue past the next decision point, and what is forfeited if you withdraw?
Which unknowns could change the answer, who owns each one, and when will it be resolved?

Weighing whether to advance a SPP queue position?

Bring the decision, and get back a management-ready decision record: what is verified, what is assumed, what is still unknown, and what to do next.

Bring One Live Decision

Sources

Facts checked September 16, 2026. Process rules and queue data change; the governing tariff, manuals and study documents control any live project.