Mountain West Transmission Group Initiative

The Mountain Transmission Group – an informal collaboration of electricity service providers working to develop strategies to adapt to changes in the electric industry – began discussions in 2013 to evaluate a suite of options ranging from a common transmission tariff to regional transmission organization (RTO) participation. The group announced in January 2017 that they would commence discussions with SPP to explore membership in the RTO and its wholesale electricity markets and subsequently announced Sept. 22, 2017, their intent to pursue RTO membership with SPP.

On March 13, 2018, SPP’s board of directors approved the next phase of the continuing effort to integrate Mountain West as RTO members. The board approved a set of policies defining the terms and conditions of Mountain West’s potential membership in SPP. They also directed the organization’s staff and stakeholders to draft amendments to SPP’s tariff, bylaws and membership agreement in support of those policies. This marks a transition in joint efforts by SPP and Mountain West from negotiation toward implementation via SPP’s public and transparent stakeholder process. SPP hosted a March 22, 2018, webinar to discuss in detail the recommendations approved by the board.

The board’s vote was the culmination of more than a year of negotiations regarding the terms and conditions of Mountain West’s proposed membership in the SPP RTO and participation in SPP’s wholesale electricity markets. It represents a vote of confidence in the value of Mountain West’s membership and the benefits it will bring to SPP’s existing members, the Mountain West entities, and the customers served by both.

Xcel Energy-Colorado announced on April 20 that it would exit the Mountain West Transmission Group, but SPP remains committed to working with the other Mountain West entities to pursue an agreement that will be beneficial to all parties involved. 

SPP's governing documents - some of which may be revised to address the terms of Mountain West's potential membership - are accessible in the Document Library’sGoverning Documents” folder. To request additions, edits, deletions or clarifications to governing documents, SPP requires that a revision request (RR) be submitted. The SPP Revision Requests page describes the RR process and links to RR-related forms and other information. SPP will notify stakeholders via email distribution list when governance changes will be addressed in working group meetings. 

Questions about Mountain West’s potential membership in SPP should be submitted through the SPP Request Management System (RMS). The RMS allows anyone to confidentially submit questions; access a knowledge-base of current issues, resolutions, and information, and track the status of submissions. For Mountain West-related submissions, just select “Mountain West Transmission Group (MWTG) Inquiries” from the list of Quick Picks on the Submit Request form. Instructions on will help users quickly and easily create an RMS account to submit inquiries regarding Mountain West and other topics. 

Mountain West Transmission Group email distribution list

SPP communicates with its stakeholders regarding the activities of its organizational groups and other topics via email distribution lists.

If you would like to subscribe to the Mountain West distribution list to receive news and information but do not have an account, you may create one using the Create Account button at the top right.

Registered users who are logged in may subscribe and unsubscribe to exploders via their profile page.

Look for the list called "Mountain West Transmission Group Communications."

Media Contacts:

  • Derek Wingfield (Southwest Power Pool): (501) 614-3394, dwingfield[at]
  • Lisa Meiman (Western Area Power Administration): meiman[at]