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December 5, 2025

SPP Tariff attachment Z2

© RTO Insider
SPP Ponders Congestion Rights as Z2 Solution
SPP stakeholders are pondering the use of incremental long-term congestion rights to help solve some of the complexity with the RTO’s Z2 crediting process.
SPP Board Lets Action on Z2 Stand; Litigation Likely
The Southwest Power Pool Board of Directors and Members Committee decided to take no further action on the contentious Z2 crediting issue.
© RTO Insider
MOPC Rejects Z2 Waivers; Task Force Seeks Changes
SPP stakeholders once again took up the issue of Z2 waivers at last week's MOPC, and once again, the discussion was lively.
SPP Briefs
Southwest Power Pool (SPP) stakeholders have recommended the RTO’s leadership reject $114 million in remaining waiver requests for Z2 transmission upgrades.
Preliminary Z2 Bills Released; Task Force Develops Options for Waiver Requests
An SPP task force hopes to recommend one of six options for handling $114 million in upgrades under Tariff Attachment Z2 to the Markets and Operations Policy Committee next month.
New SPP Task Forces Looking at the Future — and Past
The two newest SPP stakeholder groups are taking a look at the future, while also stepping almost a decade into the past to resolve the sticky issue of Tariff Attachment Z2.
Board Approves Z2 Timeline Extension, Creates Task Force for Further Study
The SPP Board of Directors agreed to give transmission customers an extra 50 months to pay their Z2 bills while also creating a new task force to address complaints of members.
SPP Z2 Project Faces Further Hurdles, Possible Delay
SPP’s Z2 crediting project may now stretch into 2017 after the Board of Directors sided with stakeholders and delayed a vote on waiver requests.
SPP Sets Z2 Review Session for June 28-29
SPP will hold a two-day review session for the Attachment Z2 credit-settlement system June 28-29 at its Little Rock headquarters.
SPP Markets and Operations Policy Committee Briefs
A summary of issues discussed by the SPP Markets and Operations Policy Committee on April 12 to 13.

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