Transmission Construction Clearance Optimization June 25, 2010 Tod Whitley & Jen Fiegel ERCOT Reliability Operations Subcommittee Meeting

What’s Inside / Coming Attractions Planning Phase Design Phase Execution Phase Q&A Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Planning Phase Engineering design for minimizing future clearance / outage Two construction seasons (clearance driven) Pre-engineering meeting Access plan / ROW Unit pricing versus time & material Environmental Endangered species USACE property permitting / remediation approval Eng design: DE outside station minimizes station outage for pulling rig. Location of switches in station minimizes outages for future additions. Pre-eng: Constructability versus design. Is design conducive to minimizing clearance. Is it feasible? Does it require a mobile or can we do it without a mobile? Endangered species: ID methods of performing work/seasons allowable. Unique Unit Pricing Contract allows great flexibility with work hours and is an incentive for contractor to work efficiently. Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Design Phase Create work sequence drawings Mobile bypass / line bypass Coordinate with Distribution for load transfer options Continuous vs daily clearance Identify work that can be done without equipment clearance Coordinate Oncor / Contractor work under same clearance. Ex: line rebuild, terminal upgrade Coordinate with City / Municipality events director Identify where a mobile bypass or line bypass will be required or will substantially shorten clearance requirements. Load transfer options with Distribution can drive the timing and sequencing of a project. Continuous clearances generally speed up project due to grounding time. This is a big safety issue. Foundations, assembly, some pole erection Work we cannot do: Set poles in line, wire pulling, repair airswitch Cities will have sporting or other events that prevent weekend work. Work/noise ordinances can affect clearance duration. Exceptions are sometimes granted. Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Conversion of Station G to 138kV operation WA#XXXXXXXX Convert Station G from 69kV to 138kV operation Relocate existing GT from 69kV P-G line Construct new GT on the 138kV P-G line Build 1 mile of new 138kV line Coordinate conversion of Coop Sta SS from 69kV to 138kV operation Rev 10 3/30/10 Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Black – Energized Green – De-energized Red – New Blue - Remove April 1, 2010 Initial configuration after Coop has completed new feeder out of Station W (Final configuration is on the last page) Tie to Station W Tie to Station SS Coop XXXX Station G XXX Tie to Station G Removable jumper TJ-XXX XXXX 69kV XXXX Station SST Station SS (Coop) Station S AS XXX Station GE (Other) GT xxx N.O. XXX Sta P Station GAT AS XXX 69kV AS xxx LDB xxx N.O. AS XXX AS XXX xxx AS xxx Station W (Coop) 138kV LDS xxxx LDS xxxx LD xxxx Sta SLM Station WBSE Rev 10 3/30/10 Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Black – Energized Green – De-energized Red – New Blue - Remove Tie to Station W Tie to Station SS September 7-27 Begin setting tangent poles in green field area Coop XXXX Station G XXX Tie to Station G TJ-XXX XXXX 69kV XXXX Station SST Station SS (Coop) Station S AS XXX Station GE (Other) GT xxx N.O. xxx Sta P Station GAT AS XXX 69kV AS xxx LDB xxx AS xxx AS xxx N.O. AS xxx Station W (Coop) 138kV LDS xxxx LDS xxxx LD xxxx Sta SLM Station WBSE Rev 10 3/30/10 Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Black – Energized Green – De-energized Red – New Blue - Remove 1/10 Tie to Station W Tie to Station SS April 20 (morning) De-energize feed to Sta G and Sta SS for 2 hours Set anchor bolt cage for anchor bolted foundation for structure 1/10 Place 69kV tap back in service after cage has been set Coop xxxx Station G xxx Tie to Station G TJ-xxx xxxx 69kV xxxx Station SST Station SS (Coop) Station S 1/10 AS xxx Station GE (Other) GT xxx N.O. xxx Sta P Station GAT AS xxx 69kV AS xxx LDB xxx N.O. AS xxx AS xxx AS xxx Station W (Coop) 138kV LDS xxxx LDS xxxx LD xxxx Sta SLM Station WBSE Rev 10 3/30/10 Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

New switch structure foundation Black – Energized Green – De-energized Red – New Blue - Remove Tie to Station W Tie to Station SS September 27-30 (4 days) Line clearance on 138kV to install anchor bolt foundations for new switch structure Set three pole dead-end Coop xxxx Station G xxx Tie to Station G TJ-xxx xxxx 69kV xxxx Station SST Station SS (Coop) Station S AS xxx Station GE (Other) 1/10 GT xxx N.O. xxx Sta P Station GAT AS xxx 69kV AS xxx LDB xxx N.O. AS xxx AS xxx AS xxx Station W (Coop) 138kV LDS xxxx LDS xxxx LD xxxx Sta SLM New switch structure foundation Station WBSE Rev 10 3/30/10 Three pole dead-end Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Black – Energized Green – De-energized Red – New Blue - Remove November 3 (morning) Transfer all load at Sta G to Sta Sta WBSE Coop to transfer all load off of Sta G and Sta SS Take 69kV line clearance to remove TJ-xxx Remove high side jumper at Sta S (permanent) Remove and decommission AS xxx at Sta G (permanent) Asset Commission and NOMCR Tie to Station W Tie to Station SS Coop xxxx Station G Remove and decommission AS xxx xxx Tie to Station G Remove temporary jumper TJ-xxx xxxx 69kV xxxx Station SST Station SS (Coop) Station S AS xxx Station GE (Other) GT xxx N.O. xxx Sta P Station GAT AS xxx 69kV AS xxx LDB xxx AS xxx AS xxx N.O. AS xxx Station W (Coop) 138kV LDS xxxx LDS xxxx LD xxxx Sta SLM Station WBSE Rev 10 3/30/10 Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Temporary Jumper TJ-xxx (removed) Black – Energized Green – De-energized Red – New Blue - Remove Tie to Station W Tie to Station SS November 3 (afternoon) Place 69kV line back in service with Sta G isolated for conversion work to begin. Coop xxxx Station G Tie to Station G Temporary Jumper TJ-xxx (removed) xxxx 69kV xxxx Station SST Station SS (Coop) Station GE (Other) GT xxx N.O. xxx Sta P Station GAT AS xxx 69kV AS xxx LDB xxx AS xxx AS xxx N.O. AS xxx Station W (Coop) 138kV LDS xxxx LDS xxxx LD xxxx Sta SLM Station WBSE Rev 10 3/30/10 Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Black – Energized Green – De-energized Red – New Blue - Remove Tie to Station W Tie to Station SS November 8-11 (4 days) Line clearance on 138kV to install switch structure and switches. Put 138kV line normal Asset Commission and NOMCR Coop xxxx Station G Tie to Station G TJ-xxx xxxx 69kV xxxx Station SST Station SS (Coop) Station GE (Other) GT xxx N.O. xxx Sta P Station GAT AS xxx 69kV AS xxx LDB xxx N.O. AS xxx AS xxx AS xxx Station W (Coop) LS xxxx LS xxxx 138kV LDS xxxx N.O.LDS xxxx LDS xxxx LD xxxx Sta SLM Station WBSE Rev 10 3/30/10 Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Black – Energized Green – De-energized Red – New Blue - Remove November 12-17 (6 days) Take 69kV line clearance to set 1/9, 1/10, 2/1, set new wood H-frame, pull rope, pull conductor, replace TJ-xxx Remove existing 69kV switches at existing tap Remove wood structures at existing tap Complete the demolition Sta S Asset Commission and NOMCR Tie to Station W Tie to Station SS Coop xxxx Station G FID xxx Tie to Station G Replace TJ-xxx xxxx xxxx 138kV Station SST Station SS (Coop) Station GE (Other) GT N.O. xxx Sta P Station GAT AS xxx 69kV AS xxx LDB xxx AS xxx N.O. AS xxx AS xxx xxx xxx Station W (Coop) LS xxxx LS xxxx 138kV LDS xxxx N.O. LDS xxxx LDS xxxx LD xxxx Sta SLM Station WBSE Rev 10 3/30/10 Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Black – Energized Green – De-energized Red – New Blue - Remove November 17, 2010 Final configuration after tap has been relocated and converted to 138kV operation Tie to Station W Tie to Station SS Coop xxxx Station G FID xxx Tie to Station G xxxx xxxx 138kV Station SST Station SS (Coop) Station GE (Other) N.O. xxx Sta P Station GAT 69kV AS xxx LDB xxx xxx xxx xxx AS xxx Station W (Coop) LS xxxx LS xxxx 138kV LDS xxxx N.O. LDS xxxx LDS xxxx LD xxxx GT (138kV) Sta SLM Station WBSE Rev 10 3/30/10 Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Design Phase Nodal Market / Network Operations Model Change Request (NOMCR) Pared down version of work sequence submitted Clearance Requests Submission of data for ERCOT model Clearance request (Transmission Outage Application) Clearance Coordinators do the following: Access ERCOT Outage Scheduler (Generator schedules) Access ERCOT Outage Scheduler for other Transmission Service Providers’ schedules Contact TSP’s directly to discuss clearances in detail Check 90 day weather forecast Check load forecast Request Load flow studies On average receive ???? Number or clearancae requests daily/yearly? Important to have all permits identified and secured so as not to delay project. Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Permitting requirements Design Phase Permitting requirements TXDOT, NTTA, etc. Railroads Utilities City FAA Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Transmission Outage Application (TOA) TOA is linked with ERCOT Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Execution Phase Pre-construction meetings On-site Field Construction Coordinator Material availability monitoring Phasing diagrams Night work Manpower amplification Weather conditions (helicopters / bulldozers, skids, mats) Pre-construction meetings identify sensitive issues that could result in delay of project construction FCC coordinates day to day activities Material can be a huge issue if not actively monitored Proper phasing prevents end of construction issues and delays Night work can sometimes be used to improve project delivery Manpower amplification: Can extra manpower be used efficiently to speed up project? Weather conditions can’t be predicted, but methods to accommodate conditions are used. Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Mats in Dallas Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Skid on 345kV ROW Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

A very wet Fall and Spring in Salado Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

A very muddy ROW between Sandow and Elgin Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

When you stick a bulldozer it’s bad. Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Helicopter pulling in pulling rope on Salado-Killeen Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Summary Engineering Design / Constructability Permitting Detailed work sequence drawings ID work not requiring a clearance Coordination of work under one clearance Access ERCOT Outage Scheduler (Generator schedules) Access ERCOT Outage Scheduler for other Transmission Service Providers’ schedules Contact TSP’s directly to discuss clearances in detail Check 90 day weather forecast Check load forecast Request Load flow studies Material monitoring Manpower Weather condition mitigation methods Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Special Considerations For CREZ Projects CREZ Program Management Office to manage projects through the completion Transmission Service Providers coordination of routes, substation termination and system protection Coordinate schedules including clearances Schedules including Planned Outage Schedules published on PUC Webtool Monthly monitoring of project schedule Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010

Q & A Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010