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Western Area Power Administration (WAPA)

Open Access Transmission Tariff (OATT) Revision(s), Status and Postings

Last Update(s): 07/07/2022 (NEW): Stakeholder Meeting Presentation Available (Updated 07/01/2022 Posting)

07/01/2022: Posting of Proposed OATT Revision 22-01 Redline Documents, Start of Informal Comment Period, and Upcoming Posting of Stakeholder Meeting Presentation




Currently planned, active, or completed WAPA OATT revisions:

1. OATT Revision 22-01 (DSW Participation in EIM) (Active)

Completed OATT Revisions



OATT Revision 22-01 (Active) (DSW participation in CAISO EIM) : (FAQs: WAPA-Proposed-OATT-Revision-22-01-FAQs.pdf, Version: 06/02/2022)

07/07/2022: Stakeholder Meeting Presentation Available (Updated 07/01/2022 Posting)
07/01/2022: Posting of Proposed OATT Revision 22-01 Redline Documents
, Start of Informal Comment Period, and Upcoming Posting of Stakeholder Meeting Presentation

WAPA has posted the Proposed OATT Revision 22-01 Redline documents to address
DSW's planned participation in the CAISO EIM below. The proposed OATT revisions will be presented at the the Stakeholder Meeting July 14, 2022 at 10am MDT/9am Arizona Time (via WebEx). Webex Info

WAPA-OATT-Revision-22-01-OATT-Redline--DRAFT.pdf; Proposed redlines to OATT main provisions, including proposed new OATT Attachment T

WAPA-OATT-Revision-22-01-Stakeholder-Meeting-Presentation.pdf (Posted 07/07/2022); WAPA will post the presentation for the July 14th meeting prior to the meeting. The presentation will summarize the proposed OATT revisions, and provide Background Information, Next Steps, Revision Timelines.

This posting begins the 30-day informal comment period.  WAPA invites all interested parties to attend the Stakeholder Meeting, and provide comments.  Please also submit any comments in writing by August 1, 2022, to: tariffcomments@wapa.gov.


06/02/2022: Initial Notification of OATT Revision 22-01 (DSW participation in CAISO EIM), Announcement of Stakeholder Meeting on July 14, 2022:

WAPA has posted notice on its www.wapa.gov website of: (1) the intent of the Desert Southwest Region (DSW) to participate in the the California Independent System Operator's (CAISO) Western Energy Imbalance Market (EIM). Information regarding DSW's plans for participation in the CAISO EIM is available at the following URL: https://www.wapa.gov/regions/DSW/Pages/DSW-EIM.aspx.

WAPA is proposing OATT revisions to address DSW's planned participation in the CAISO EIM on or around April 5, 2023. See announcement here: WAPA-Proposed-OATT-Revision-22-01-Announcement.pdf. WAPA is also providing notice via electronic mail to its customers/stakeholders.

As part of WAPA's process to seek stakeholder comments on the proposed OATT revisions, WAPA will hold a Stakeholder Meeting on July 14, 2022 at 10am MDT/9am Arizona Time (via WebEx) to present its proposed complete set of OATT revisions for OATT Revision 22-01 for DSW's participation in the EIM. WebEx information is here: Webex Info. WAPA's 30-day comment period will begin once WAPA posts its proposed complete set of OATT revisions on its Regional OASIS sites on or about July 1, 2022, ahead of the July 14, 2022, Stakeholder Meeting. WAPA invites all interested parties to attend. In addition to sharing the proposed revisions, WAPA will also outline the expected timeline to respond to stakeholder feedback, complete the OATT revisions, and file the OATT revisions with FERC.

Additional details, including the meeting presentation and redlines of WAPA's proposed OATT revisions, will be posted on this page prior to the July 14, 2022, Stakeholder Meeting.
WAPA will also provide notice via electronic mail of these postings, as needed. 

Please direct questions/comments to your
OATT Regional contact(s).


WAPA OATT Regional Transmission Provider contact(s):

- Desert Southwest Region (DSW): John Steward at 602-605-2774 (steward@wapa.gov)
- Rocky Mountain Region (RMR) and Colorado River Storage Project (CRSP): Sean Erickson at 970-461-7584 (erickson@wapa.gov)
- Sierra Nevada Region (SNR): Cory Danson at 916-353-4402 (danson@wapa.gov) or Ira Witherspoon at 916-353-4659 (withersp@wapa.gov)
- Upper Great Plains Region (UGP): Steve Sanders at 406-255-2807 (sanders@wapa.gov) or Dirk Shulund at 406-255-2840 (shulund@wapa.gov)



Any other questions can be directed to:  Steve Sanders (WAPA-UGP) at 406-255-2807 (sanders@wapa.gov).

Update History:

OATT Revision 22-01 (DSW EIM)
07/07/2022: Stakeholder Meeting Presentation Available (Updated 07/01/2022 Posting)
07/01/2022: Posting of Proposed OATT Revision 22-01 Redline Documents, Start of Informal Comment Period, and Upcoming Posting of Stakeholder Meeting Presentation
06/02/2022: Initial Notification of Planned OATT Revision 22-01 (DSW participation in CAISO EIM), Announcement of Stakeholder Meeting on July 14, 2022: