March 14, 2008 TEPPC Mtg WestConnect Subregional Planning Update Jerry D. Smith WestConnect Planning Manager

TEPPC Mtg2 WestConnect Subregional Planning Groups Colorado Coordinated Planning Group Southwest Area Transmission CCPG SWAT SIERRA New Area ? CCPG and SWAT act as WestConnect technical planning work groups for WestConnect planning area Coordinate Base Cases for use by all study participants Define subregional study plans, provide study resources, and perform studies Provide forum for coordination and peer review of planning studies and 10-year plans

TEPPC Mtg WestConnect Subregional Planning Participants 13 WestConnect Project Agreement for Subregional Transmission Planning Members 15 Other Participating Utilities 15 Governmental Entities 29 At large Industry Participants

TEPPC Mtg4 Status of WestConnect Subregional Planning Process 2007 Planning Cycle concluded –Annual Planning Meeting 1/17/08 –Ten Year Plan and Planning Report approved by Planning Mgmt Comm / Steering Comm 2008 Planning Cycle has commenced –2013 & 2018 Base Case being coordinated –Annual Adequacy Study of Plan this summer –Biennial Long Range Study conclude in 2009 –SWAT and CCPG will oversee Other Studies

TEPPC Mtg5

6 WestConnect Annual Adequacy Study Purpose – test the adequacy of most recently published WestConnect Transmission Plan (excluding conceptual projects) A WestConnect-wide study utilizing the 5 th and 10 th year coordinated base cases Perform traditional N-0, N-1 and N-2 contingency outages Establish reliability risk of potential corridor outages with planned transmission projects in 10 th year Complete studies by August joint CCPG/SWAT meeting Deficiencies in plan noted with sufficient lead time for subregional planning participants to investigate solutions for inclusion in the 2008 WestConnect Transmission Plan

TEPPC Mtg7 WestConnect Biennial Long Range Study Purpose – Biennially explore conceptual long range transmission needs within WestConnect Planning Area. A Westconnect –wide study of contemporary issues facing the industry in the 10 th year and beyond. Utilizes the 10 th year coordinated base case with load forecasts and generation scenarios representative of the study time period. Study limited to power flow and only considers N-1 outages. Initial study has two fold objective: –Provide traditional transmission reliability oriented studies in response to the TEPPC economic transmission study results, –Study WestConnect-wide integration of renewable energy projects Complete initial study in 2009

TEPPC Mtg8 Colorado Energy Resource Zones

TEPPC Mtg9 NM Wind Collector System Integrated with HPX

TEPPC Mtg10 Conceptual Transmission for Renewables

TEPPC Mtg Plan Summary Type Project No. Projects Total Miles Estimated Cost (2008 $M) Planned1064,6366,969 Conceptual224,2566,204 TOTAL1288,892$ 13,173

TEPPC Mtg Plan Cost Figure 2 – Cost Distribution by Voltage Class

TEPPC Mtg13 Planned Projects by Year

TEPPC Mtg14 Conceptual Projects by Year

TEPPC Mtg15 Planned Projects by State State No. Projects Total Miles Estimated Cost (2008 $M) Arizona661,4032,331 California107591,593 Colorado161,8922,016 Nevada New Mex Texas55024 Multi-State000 TOTAL1064,636$ 6,969

TEPPC Mtg16 Conceptual Projects by State State No. Projects Total Miles Estimated Cost (2008 $M) Arizona California11827 Colorado000 Nevada13170 New Mex Texas000 Multi-State33,8505,800 TOTAL224,256$ 6,204