October 12, 2007ERCOT Regional Planning Group Meeting

RPG-CREZ Task ForceStatus Report

Warren LasherSystem Assessment

2ERCOT Regional Planning Group Meeting

October 12, 2007

Work Accomplished

5 RPG-CREZ Meetings have been held (Aug. 31, Sept. 7, 14, 28, and Oct. 8)

The following issues have been addressed:− Issues List− Generic assumptions for 345-kV transmission

(modeling parameters and costs)− 765-kV transmission technology− HVDC transmission technology− Initial possibilities for CREZ collection lines

3ERCOT Regional Planning Group Meeting

October 12, 2007

Issues List

A list of issues has been developed and has been discussed at several RPG-CREZ meetings.

This list is available at the RPG-CREZ web-page

Now that the Interim Order has been issued, the Issues List will be reevaluated at the next RPG-CREZ meeting (10/19).

4ERCOT Regional Planning Group Meeting

October 12, 2007

345-kV Technology Generic Data

NOTE: IMPEDANCE BASED UPON 100MVA P.U / MILE

1 CKT.

2 CKT.

1 CKT.

2 CKT.

CONDUCTOR

STRUCTURE TYPE R JX B

RATE A

RATE B $M $M

MVA/$M

MVA/$M

2-1590 ACSR

DC LATTICE VERTICAL

2.92E-05

4.61E-04

9.17E-03 1,631 1,631 $1.4 $1.68 1,165 1,942

2-959 ACSS/TW

DC LATTICE VERTICAL

4.78E-05

4.83E-04

8.85E-03 1,969 1,969 $1.3 $1.56 1,515 2,524

2-1433 ACSS DC LATTICE3.00E-

054.70E-

049.02E-

03 2,988 2,988 $1.5 $1.80 1,992 3,320

R JX BRATE

ARATE

B Cost

600 Mva Auto2.50E-

041.90E-

02 0 600 600 $8 M

800 Mva Auto1.80E-

041.60E-

02 0 800 800 $9 M

RING BUS 6 - LINE TERMINALS = $15 M

BREAKER & 1/2 > 6 - LINE TERMINALS = $25 M

5ERCOT Regional Planning Group Meeting

October 12, 2007

765-kV and HVDC Technology

Vendors and stakeholders provided technical discussions of these technologies.

ETT Representatives presented a description of 765-kV transmission.

ABB and GE representatives described classic HVDC technology, “HVDC-Light” technology, and Variable Frequency Transformers.

6ERCOT Regional Planning Group Meeting

October 12, 2007

CREZ Connection Pathways

Preliminary discussions have been conducted regarding possible pathways for connecting CREZ areas to existing ERCOT transmission infrastructure.

Additional discussions will be held at future RPG-CREZ meetings.

7ERCOT Regional Planning Group Meeting

October 12, 2007

Project Timeline

1 2 3 4 5 6 7 8 9 10 11 12

Gridlines Represent 2-Week Periods

Gather Options for Connections in CREZ Areas

Stability Analysis

Evaluate Options for System Connections

Est

ab

lish

Ma

ilin

g L

ist

an

d S

et

Me

etin

g S

che

du

le

Modify Base Case for Higher Wind Scenarios

Incorporate Results of A/S Study

Review Results

Evaluate System Upgrade Options for Higher Wind Scenarios

ERCOT Review and Report

Questions or Comments?