Oncor Electric Delivery Company LLC

Transmission Construction Clearance Optimization

June 25, 2010Tod Whitley & Jen FiegelERCOTReliability OperationsSubcommittee Meeting

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 2Oncor Electric Delivery Company LLC

What’s Inside / Coming Attractions

Planning Phase

Design Phase

Execution Phase

Q&A

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 3Oncor Electric Delivery Company LLC

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

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 4Oncor Electric Delivery Company LLC

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

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 5Oncor Electric Delivery Company LLC

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 6Oncor Electric Delivery Company LLC

Station G

Station S

GT

Station W (Coop)

Station SS (Coop)

Station SST

XXXXCoop

69kV

138kV

Station WBSE

Station GATStation GE

(Other)

Removable jumper TJ-XXX

XXX

AS xxxAS XXX

XXXXXXXX

AS XXX

N.O. AS XXX

LDB xxx

AS xxx

AS XXX

Sta SLMLDS xxxx

LD xxxx

LDS xxxx

Tie to Station G

Tie to Station SS

Tie to Station W

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)

xxx xxx

N.O. XXX

xxx

Sta P

69kV

Rev 10 3/30/10

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 7Oncor Electric Delivery Company LLC

XXXX

69kV

138kV

TJ-XXX

XXX

AS xxxAS xxx

XXXXXXXX

AS XXX

LDB xxx

AS xxx

LDS xxxx

LD xxxx

LDS xxxx

Black – Energized

Green – De-energized

Red – New

Blue - Remove

September 7-27

Begin setting tangent poles in green field area

xxx

N.O. xxx

xxx

69kV

N.O. AS xxx

AS XXX

Rev 10 3/30/10

Station W (Coop)

Tie to Station G

Tie to Station SS

Tie to Station W

Station G

Station SS (Coop)

Station SST

Station S

GTStation GE

(Other)Station GAT

Station WBSESta SLM

Sta P

Coop

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 8Oncor Electric Delivery Company LLC

xxxx

69kV

138kV

TJ-xxx

xxx

AS xxxAS xxx

xxxxxxxx

AS xxx

LDB xxx

AS xxx

LDS xxxx

LD xxxx

LDS xxxx

Black – Energized

Green – De-energized

Red – New

Blue - Remove

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

1/10

xxx

N.O. xxx

xxx

69kV

N.O. AS xxx

AS xxx

Rev 10 3/30/10

Station W (Coop)

Tie to Station G

Tie to Station SS

Tie to Station W

Station G

Station SS (Coop)

Station SST

Station S

GTStation GE

(Other)Station GAT

Station WBSESta SLM

Sta P

Coop

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 9Oncor Electric Delivery Company LLC

xxxx

69kV

138kV

TJ-xxx

xxx

AS xxxAS xxx

xxxxxxxx

AS xxx

LDB xxx

AS xxx

LDS xxxx

LD xxxx

LDS xxxx

Black – Energized

Green – De-energized

Red – New

Blue - Remove

September 27-30 (4 days)

•Line clearance on 138kV to install anchor bolt foundations for new switch structure

•Set three pole dead-end

1/10

New switch structure foundation

xxx

N.O. xxx

xxx

Three pole dead-end

69kV

N.O. AS xxx

AS xxx

Rev 10 3/30/10

Station W (Coop)

Tie to Station G

Tie to Station SS

Tie to Station W

Station G

Station SS (Coop)

Station SST

Station S

GTStation GE

(Other)Station GAT

Station WBSESta SLM

Sta P

Coop

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 10Oncor Electric Delivery Company LLC

xxxx

69kV

138kV

Remove temporary jumper TJ-xxx

xxx

AS xxxAS xxx

xxxxxxxx

AS xxx

LDB xxx

AS xxx

AS xxx

LDS xxxx

LD xxxx

LDS xxxx

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

xxx

N.O. xxx

xxx

69kV

N.O. AS xxx

Remove and decommission AS xxx

Rev 10 3/30/10

Station W (Coop)

Tie to Station G

Tie to Station SS

Tie to Station W

Station G

Station SS (Coop)

Station SST

Station S

GTStation GE

(Other)Station GAT

Station WBSESta SLM

Sta P

Coop

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 11Oncor Electric Delivery Company LLC

xxxx

69kV

138kV

Temporary Jumper TJ-xxx

(removed)

AS xxxAS xxx

xxxxxxxx

AS xxx

LDB xxx

AS xxx

LDS xxxx

LD xxxx

LDS xxxx

Black – Energized

Green – De-energized

Red – New

Blue - Remove

November 3 (afternoon)

•Place 69kV line back in service with Sta G isolated for conversion work to begin.

xxx

N.O. xxx

xxx

69kV

N.O. AS xxx

Rev 10 3/30/10

Station W (Coop)

Tie to Station G

Tie to Station SS

Tie to Station W

Station G

Station SS (Coop)

Station SST

GTStation GE

(Other)Station GAT

Station WBSESta SLM

Sta P

Coop

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 12Oncor Electric Delivery Company LLC

xxxx

69kV

138kV

TJ-xxx

AS xxxAS xxx

xxxxxxxx

AS xxx

LDB xxx

AS xxx

LDS xxxx

LD xxxx

LDS xxxx

Black – Energized

Green – De-energized

Red – New

Blue - Remove

November 8-11 (4 days)

•Line clearance on 138kV to install switch structure and switches.

•Put 138kV line normal

•Asset Commission and NOMCR

xxx

N.O. xxx

xxx

N.O.LDS xxxx

LS xxxx

LS xxxx

69kV

N.O. AS xxx

Rev 10 3/30/10

Station W (Coop)

Tie to Station G

Tie to Station SS

Tie to Station W

Station G

Station SS (Coop)

Station SST

GTStation GE

(Other)Station GAT

Station WBSESta SLM

Sta P

Coop

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 13Oncor Electric Delivery Company LLC

xxxx

69kV

138kV

Replace TJ-xxx

FID xxx

AS xxxAS xxx

xxxxxxxx

AS xxx

LDB xxx

AS xxx

LDS xxxx

LD xxxx

LDS xxxx

Black – Energized

Green – De-energized

Red – New

Blue - Remove

xxx

N.O. xxx

xxx

LS xxxx

LS xxxx

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

138kV

N.O. AS xxx

N.O.

LDS xxxx

Rev 10 3/30/10

Station W (Coop)

Tie to Station G

Tie to Station SS

Tie to Station W

Station G

Station SS (Coop)

Station SST

GTStation GE

(Other)Station GAT

Station WBSESta SLM

Sta P

Coop

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 14Oncor Electric Delivery Company LLC

GT (138kV)

xxxx

69kV

138kV

AS xxx

xxxxxxxx

LDB xxx

AS xxx

LDS xxxx

LD xxxx

LDS xxxx

Black – Energized

Green – De-energized

Red – New

Blue - Remove

xxx

N.O. xxx

xxx

LS xxxx

LS xxxx

November 17, 2010

Final configuration after tap has been relocated and converted to 138kV operation

xxx

FID xxx

138kV

N.O.

LDS xxxx

Rev 10 3/30/10

Station W (Coop)

Tie to Station G

Tie to Station SS

Tie to Station W

Station G

Station SS (Coop)

Station SST

Station GE (Other)Station GAT

Station WBSESta SLM

Sta P

Coop

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 15Oncor Electric Delivery Company LLC

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

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 16Oncor Electric Delivery Company LLC

Design Phase

Permitting requirements

TXDOT, NTTA, etc.

Railroads

Utilities

City

FAA

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 17Oncor Electric Delivery Company LLC

Transmission Outage Application (TOA)

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 18Oncor Electric Delivery Company LLC

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 19Oncor Electric Delivery Company LLC

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)

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 20Oncor Electric Delivery Company LLC

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 21Oncor Electric Delivery Company LLC

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 22Oncor Electric Delivery Company LLC

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 23Oncor Electric Delivery Company LLC

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 24Oncor Electric Delivery Company LLC

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 25Oncor Electric Delivery Company LLC

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 26Oncor Electric Delivery Company LLC

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 27Oncor Electric Delivery Company LLC

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 28Oncor Electric Delivery Company LLC

Tod Whitley & Jen Fiegel ERCOT ROS Presentation 06/25/2010 29Oncor Electric Delivery Company LLC

Q & A