October 16, 2009

RPG Meeting

ERCOT 2009 Five-Year Transmission Plan Update

Jeff Billo

RPG Meeting October 16, 2009 2

2009 Five-Year Transmission Plan: Where we’re at

  2014 2013 2012 2011 2010

Conditioned Case          

N-X Analysis          

G-1 + N-X Analysis          

TO/ MP Input          

Reliability Project Backout          

Reliability AC Case          

Economic Analysis          

AC Case with All Upgrades          

= Complete = In Process = Not Started

RPG Meeting October 16, 2009 3

2009 Five-Year Transmission Plan Reliability Analysis

• Two significant project changes since last update– Changed Alliance 345/138-kV autotransformer project to Hicks 345/138-kV

autotransformer project – Changed addition of second 345/138-kV autotransformer to Mustang 345-kV

station and autotransformer project

• Miscellaneous reliability project changes since last update based on comments from Transmission Owners

RPG Meeting October 16, 2009 4

Hicks 345/138-kV autotransformer project

• Reliability Issue: One Roanoke 345/138 kV autotransformer overloads for the loss of the other Roanoke 345/138 kV autotransformer in 2013 and 2014

• Not feasible to replace both Roanoke autotransformers or add a third autotransformer

• Additional need to add transmission southwest of Roanoke for load growth needs

RPG Meeting October 16, 2009 5

Hicks 345/138-kV autotransformer project

• Two options studied:1. Build new 345/138 kV station near Alliance; construct double circuit 138 kV line

from new station to new load serving stations to Elizabeth Creek• Cost = $21.5M + cost of new 138 kV double circuit

2. Construct a 138 kV bus at the new Hicks CREZ station and install a 345/138 kV autotransformer, construct double circuit 138 kV line from Hicks to new load serving stations to Elizabeth Creek• Cost = $11.0 M + cost of new 138 kV double circuit

– Length of new 138 kV double circuit roughly the same for both options so cost assumed to be the same

• Both options tested in 5YTP 2014 economic case with and without CREZ generation– Hicks option resulted in production cost savings of $2.12M in 2014 economic

benchmark case– Hicks option resulted in production cost savings of $3.75M in 2014 economic case

with CREZ generation– Savings resulted from reduction in congestion on the Hicks-Alliance 345 kV line

for the contingency of Hicks-Roanoke 345 kV line• Option 2 (Hicks) recommended as preferred option

RPG Meeting October 16, 2009 6

Mustang 345 kV station project

• 2014 Reliability Issues: – Collin 345/138 kV autotransformer overloads for the contingency loss

of Collin-Carrollton Northwest 345 kV line– Low voltages on Kruegerville-Frisco 138 kV line for the contingency

loss of Collin-Frisco 138 kV line– Existing series reactor at Collin (SPS) does not relieve overload in 2014

RPG Meeting October 16, 2009 7

Mustang 345 kV station project

• Two options studied1. Add second 345/138 kV autotransformer at Collin, install shunt capacitors on

Kruegerville-Frisco line– Existing stations on Kruegerville-Frisco line not sized for capacitor bank additions– Cost ~ $11-12M

2. Create a 345 kV bus at Mustang, loop one circuit the Anna-Krum West 345 kV CREZ line into Mustang, install a 345/138 kV autotransformer at Mustang– Cost ~ $18.5M

• Other considerations– High load growth area– Mustang option (Option 2) provides support to east side of Denton loop

• Mitigates the need to reconductor Pockrus-Denton Steam 138-kV line (<$1M)

• Option 2 recommended as preferred option

RPG Meeting October 16, 2009 8

2009 Five-Year Transmission Plan Economic Analysis

2014 Economic Projects

RPG Meeting October 16, 2009 9

2009 Five-Year Transmission Plan Economic Analysis

• 2014 Changes since August RPG Meeting– Various model corrections and updates (see posted spreadsheet: “2009 5YTP

Economics 2014 Project Set 09182009.xls”)– Changed Horse Hollow 3 to inject into Kendall (via NextEra private 345 kV

line)• To relieve congestion due to contingency loss of one Bluff Creek 345/138

kV autotransformer overloading the other Bluff Creek autotransformer• Not economic to switch more Horse Hollow generation to Kendall due to

congestion near Kendall– Ten economic projects:

Upgrade the Alvin Tie Sw Station (39015) – Alvin Sub (39030) and the Hastings Sub (39010) – Friendswood Sub (38980) – Seminole Sub (38990) - Magnolia Sub (38950) 138 kV lines from 190/190/190 to 326/326/326 MVA

Add a 345/138 kV autotransformer at Panhandle A_D (99104) and rebuild Matador-Spur as a double circuit line with one side operated at 138 kV and the other side operated at 69 kV. Connect McAdoo and Whirlwind to the 345/138 kV autotransformer via 138 kV lines. The 138 kV circuit will not be connected to the load serving system. The 69-kV circuit will be connected only to the load serving system.

Add a second circuit to Oasis (43035) – South Alvin (43030), 345 kVUpgrade the 345/138 kV autotransformer at Greens Bayou from 400 to 600 MVA

Upgrade the Midland East (1023) – Stanton West (1326) 138 kV line from 84/84/84 to 394/394/394 MVA

Build a second Kenedy Switching Station #1 (8184) – Kenedy (8188) 69 kV with a different right of way

Upgrade the Round Rock (3668) – Round Rock Northeast (3670) 138 kV line from 214/214/214 to 326/326/326 MVA

Upgrade the Seagoville (3076) – Kleberg Tap (3077) 138 kV line from 214/214/214 to 326/326/326 MVA

Upgrade the Hidalgo (8963)-Monte Cristo (8708)-Aderhold Substation (8754) 138 kV line to 365/365/365 MVA

Add a 1.2-ohm series reactor at the terminal of the South McAllen (8371) – Las Milpas Substation (8758) 138 kV line

RPG Meeting October 16, 2009 10

2009 Five-Year Transmission Plan

2014 Economic Analysis

Select Projects

RPG Meeting October 16, 2009 11

Alvin area projects

• New 345/138 kV station and autotransformer scheduled to be constructed at Meadow (formerly South Alvin) in May 2010

• Congestion expected on 138 kV lines exiting Meadow towards the east for contingency loss of Meadow-PH Robinson 345 kV line

• Congestion expected on Oasis-Meadow-PH Robinson 345 kV line for contingency loss of Cedar Bayou-Chambers/ Cedar Bayou-North Belt 345 kV double circuit and n-0

RPG Meeting October 16, 2009 12

Alvin area projects

• CenterPoint has TPIT project to uprate Oasis-PH Robinson 345 kV line by end of 2009

• 5YTP economic recommendations:– Add second circuit to Oasis-Meadow 345 kV line

• Cost = $4.9M• 2014 PC Savings = $2.8M • Ratio = 1.75 < 6

– Upgrade Alvin Tie (Meadow)-Alvin and Alvin Tie (Meadow)-Hastings-Friendswood-Seminole-Magnolia• Cost = $21.2M• 2011 PC Savings = $5.2M• Ratio = 4.08 < 6

*Alvin Tie (Meadow)-Hastings 138 kV line upgrade is a reliability project in 2014

RPG Meeting October 16, 2009 13

Lower Panhandle Project

• Congestion on lines exiting the Whirlwind and McAdoo wind generation plants– Daily Operations– 5YTP models

Whirlwind – 60 MW

McAdoo – 150 MW

RPG Meeting October 16, 2009 14W

hirl

win

d

Spur

Matador

Lower Panhandle Project

• 5YTP Solution – Construct project to separate wind power from load serving system and instead inject to CREZ system

• Waiting for cost estimates to determine if economic

~

~

Cottonwood(Pan A-D)

McA

doo

RPG Meeting October 16, 2009 15

2009 5YTP Next Steps

• Finish Analysis by October 30

• Report First Draft by November 13

RPG Meeting October 16, 2009 16

Questions?