Utility’s Perspective Of Future Transmission September 23, 2008

2 Key Operational Facts: F≈ 667,000 customers FMore than 6,100 MW of generation – 2006 reserve margin 12% F11,000 sq mile service territory F33,000 miles of T & D F2,100 employees FKansas retail market remains fully regulated Vertically Integrated Kansas Utility

3 Westar’s Transmission 4300 miles of transmission > 60 kV Member of Southwest Power Pool (SPP) FSPP Transmission Tariff Member FSPP Regional Entity Member for Reliability 2008 Transmission Construction budget - $150 million Two Major 345 kV projects FWichita to Hutchinson to Salina 345 kV line FWichita to Oklahoma 345 kV line 4300 miles of transmission > 60 kV Member of Southwest Power Pool (SPP) FSPP Transmission Tariff Member FSPP Regional Entity Member for Reliability 2008 Transmission Construction budget - $150 million Two Major 345 kV projects FWichita to Hutchinson to Salina 345 kV line FWichita to Oklahoma 345 kV line

4 Current Transmission Projects Wichita to Hutchinson FApproximately 40 miles Hutchinson to Salina FApproximately 60 miles Wichita to Oklahoma FApproximately 50 miles Other significant projects “inside regional footprint” Wichita to Hutchinson FApproximately 40 miles Hutchinson to Salina FApproximately 60 miles Wichita to Oklahoma FApproximately 50 miles Other significant projects “inside regional footprint”

5 Current Transmission Projects Wichita to Hutchinson to Salina 345 kV Project FWichita to Hutchison (Reno) line to be completed by the end of 2008 FReno to Salina (Summit) line to be completed by the end of 2009 Wichita to Oklahoma 345 kV project FProject to be completed by the end of 2010 These Projects eliminate two of the most highly active constraints in the SPP system Wichita to Hutchinson to Salina 345 kV Project FWichita to Hutchison (Reno) line to be completed by the end of 2008 FReno to Salina (Summit) line to be completed by the end of 2009 Wichita to Oklahoma 345 kV project FProject to be completed by the end of 2010 These Projects eliminate two of the most highly active constraints in the SPP system

6 Prairie Wind Transmission Joint venture between Westar and Electric Transmission America (ETA) ETA is owned 50/50 by AEP and Mid American AEP is the only utility in nation that has 765kV in operation AEP has designed, constructed and operated 765kV for almost 40 years Joint venture between Westar and Electric Transmission America (ETA) ETA is owned 50/50 by AEP and Mid American AEP is the only utility in nation that has 765kV in operation AEP has designed, constructed and operated 765kV for almost 40 years

7 Prairie Wind Transmission Prairie Wind was formed to design, construct and operate the first 765kV transmission west of the Mississippi SPP’s consultant Quanta identified the Prairie Wind project as the logical first step in building a 765kV overlay in the SPP Coupled with the Tallgrass Project announced by Oklahoma Gas & Electric and ETA, substantial progress will be made in realizing a transmission “interstate highway” in the SPP Prairie Wind was formed to design, construct and operate the first 765kV transmission west of the Mississippi SPP’s consultant Quanta identified the Prairie Wind project as the logical first step in building a 765kV overlay in the SPP Coupled with the Tallgrass Project announced by Oklahoma Gas & Electric and ETA, substantial progress will be made in realizing a transmission “interstate highway” in the SPP

8 Prairie Wind Transmission Prairie Wind Project

9 Benefits of Prairie Wind Project Enables substantial renewable wind development in western Kansas Provides substantial economic development benefits to Kansas via jobs for construction of line and wind farms and royalty payments to landowners Enables broader opportunities for energy markets in Kansas thereby lowering power supply costs Substantial environmental benefits Lower voltage lines will be unloaded Using 765kV technology results in substantially lower losses on the transmission system and improved reliability Enables substantial renewable wind development in western Kansas Provides substantial economic development benefits to Kansas via jobs for construction of line and wind farms and royalty payments to landowners Enables broader opportunities for energy markets in Kansas thereby lowering power supply costs Substantial environmental benefits Lower voltage lines will be unloaded Using 765kV technology results in substantially lower losses on the transmission system and improved reliability

kV Value Proposition FAdvanced six-conductor bundles for higher capacity, lower line losses and reduced noise FFiber-optic shield wires for better protection and control FWide-area monitoring, control, and remote diagnostics FIndependent-phase operation for improved line performance FLine design and right-of- way usage for least environmental impact FAdvanced six-conductor bundles for higher capacity, lower line losses and reduced noise FFiber-optic shield wires for better protection and control FWide-area monitoring, control, and remote diagnostics FIndependent-phase operation for improved line performance FLine design and right-of- way usage for least environmental impact Advanced Technology Environmental Stewardship More capacity on less land

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