SPP.org 1

Priority Project Update Bruce Rew Vice President, Engineering

SPP.org 3 Priority Project Overview Commitments to Construct have been received from all Transmission Owners Westar Energy, Mid-Kansas Electric Co., and Sunflower Electric Power Corp. propose Novation to Prairie Wind and ITC Great Plains Routing changes surrounding Medicine Lodge  Environmental/ Right-of Way issues Cost Estimate changes  Multiple causes, including re-routing, reactive support, and refining project scope within shared projects

SPP.org 4 Nebraska City - Maryville - Sibley KCPL GMO and OPPD Project Updates  Added reactive support to updated project estimates  Addition of reactive support has caused increase in cost for both KCPL GMO and OPPD  KCPL GMO forecasted contingency for higher labor, material, equipment costs  Estimates are preliminary due to limited design work, siting and procurement activities  OPPD has refined project scope and updated project estimates  Uncertainty of line route and river crossing/ROW issues increases cost estimate

SPP.org 5 Hitchland - Woodward OGE and SPS Project Updates  SPS and OGE divided construction at approximately 30 miles for SPS, 90 miles for OGE  Original OGE estimate contained total 120 miles of project  SPS estimate lower than original OGE estimate for their 30 mile section  SPS estimates are preliminary  Limited experience in double circuit 345kV construction

SPP.org 6 Woodward - Comanche County/Medicine Lodge MKEC and OGE Project Updates  Routing Changes due to environmental concerns  Woodward line proposed to terminate at Medicine Lodge instead of Comanche County  Line to move eastward and increase by approximately 40 miles  Additional line length causes significant cost increase  Proposed Novation of portions of project to Prairie Wind and ITC Great Plains  Prairie Wind will be involved in line construction, ITC Great Plains for substation

SPP.org 7 Spearville - Comanche County - Medicine Lodge - Wichita MKEC, SUNC, and WR Project Updates  Proposed Novation of portions of project to ITC Great Plains and Prairie Wind  Added reactive support to project estimates  ITC GP Substation costs increased with new reactive compensation  ITC GP still optimizing studies  Routing changes for new substation in Wichita  Prairie Wind estimates additional 5 miles of line to substation  Increased cost for additional line and substation

SPP.org 8 NW Texarkana – Valliant  No changes proposed by AEP Tulsa Reactor  No changes proposed by AEP Priority Projects Unchanged

SPP.org Project Cost Summary 9

SPP.org Updated B/C Ratio Original cumulative B/C = 1.78 Based on new cost estimates, Cumulative B/C =

SPP.org Transmission Owner Cost Changes 11

Bruce Rew Vice President, Engineering