Aurora 69 kV (Sub-Transmission) Line Addition Project

Presentation to:Aurora City Council

Mike Hasenkamp, Sr. Project Manager, NPPD;Stan Clouse, Account Manager, NPPDSeptember 25, 2012

Presentation Overview: Why This Project? Description of 69 kV (Sub-

Transmission) line Project Scope Six Parts

Project Timeline Summary Questions?

Aurora 69 kV Project Will: Enable the area’s electric system to meet

existing and projected load growth Coincide with multi-utility plans to convert

entire area to 69 kV operations Complete an NPPD plan to maintain and

increase sub-transmission system reliability Provide Aurora with multiple voltage sources

– from two different 115 kV substations Enhance reliable delivery of electric energy

to end-use customers

Photo depicts existing 69 kV line in an urban

setting (with electric distribution system

underbuild and cable TV).

69 kV Sub-Transmission Line

Six-Part Project1. Refurbish 34.5 kV line from former Downtown

Substation south along 12th Street2. Build two miles 69 kV line northeast of Aurora3. Install 69 kV switch and interconnect with

Southern Public Power District near 1st and A4. Reconfigure NPPD 115 kV substation north of

Aurora5. Change out transformer in Aurora South

Substation6. Remove six miles of old 34.5 kV line northeast

of Aurora

Aurora 69 kV ProjectBy the Numbers

Part 1:The former Downtown Substation was removed as part of the just completed Aurora Conversion Project.

Work to begin in early October 2012.

Part 2:Construct two miles of new 69 kV sub-transmission line, beginning approximately one mile north of Hwy 34, northeast of Aurora.

Work to begin mid-October 2012.

Part 3:Create an interconnection with Southern Public Power District’s existing 69 kV line. Will include approximately 500 ft. of underground line.

Work to begin in January 2013.

Part 4:Modify existing NPPD 115 kV substation one mile north of Aurora airport by switching bays for two circuits coming into substation, will include building some new line and installing some underground around the substation.

Work to begin in March 2013.

Part 5:Remove a 34.5 kV 10/12.5 MVA transformer from Aurora South Substation and install a 69 kV 10/12.5 MVA transformer.

Work to begin in April or May of 2013.

Part 6:Remove two miles of 34.5 kV line north and east of Aurora, also removing an additional four miles of 34.5 kV line running between Aurora and Hampton.

Work to begin during the second quarter of 2013.

Project Timeline (work to begin on or around)

1. Downtown Substation – October 2012

2. Northeast of Aurora – mid-October

3. 69 kV switch and Southern interconnect –January 2013

4. Reconfigure NPPD substation – March

5. Aurora South Substation – April and May

6. Northeast of Aurora – Second Quarter 2013

Project complete – mid-year 2013

In Summary The Aurora 69 kV Project will enable the

area’s electric system to meet existing and projected load growth, increase the sub-transmission system’s reliability and enhance the reliable delivery of electric energy to end-use customers.

It will be completed in six parts.

Work will begin on the project in early October 2012 and conclude approximately midway through 2013.

Questions?