Common Case Transmission Assumptions Jeff Miller SCG Chair November 2011

Common Case Transmission Assumptions (CCTA) Being prepared for TEPPC to use as their base case transmission assumptions Formally called the Foundational Transmission Project List Projects that have a high probability of being in-service and should be modeled in TEPPC’s base cases. Not a transmission plan. Being on the list and included in the WECC analysis does not mean that the projects are adopted by WECC to be part of a “WECC Plan.”

CCTA

Improvements for this year Refined criteria and improved documentation Addressing comments received from the SPSC and others Used the WECC Project Information Portal for project information Request for additional and updated information was sent to project sponsor

Process

CCTA Selection Process

Project Status Indicators Financial commitment for construction Needs to be more than a financial commitment to develop the project plan and obtain permits Project implementation status Primarily progress in permitting

Changes From Last Year Additions Removals In Service Colstrip Upgrade (western portion) Removals Harry Allen-Northwest-Amargosa Valley Archer Interconnection AESO Projects - pending AESO confirmation In Service Hughes-Wyodak South Northwest to BC Uprate Path 36 TOT3 Upgrade

Comments due November 14