1. ERCOT 2009 Five-Year Transmission Plan Update
Jeff Billo
RPG Meeting
November 13, 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
November 13, 2009
RPG Meeting

3. 2009 Five-Year Transmission Plan Update
Significant project changes since last update
Changed back to addition of second Collin 345/138-kV autotransformer instead of Mustang 345-kV station and autotransformer project
Upgrade required by 2013 summer peak
Mustang project was dependent on Krum West-Anna 345-kV CREZ project which may not be completed by 2013 summer peak
Could not economically justify lower Panhandle project to redirect McAdoo and Whirlwind wind generation to the CREZ
ERCOT cost estimate ~ $66M
Final Annual PC Savings = $4.4M
Capital cost/ Annual PC Savings = 15 > 6
Whirlwind
Spur
Matador ~
Cottonwood
(Pan A-D)
McAdoo
Miscellaneous project changes since last update based on comments from Transmission Owners
See recent 5YTP POI website postings
November 13, 2009
RPG Meeting

4. West/ North Curtailment
2009 5YTP Wind Curtailment
Wind curtailment in latest economic case for each year
Sum of Wind Generated GWh/ Sum of Wind Profile GWh
Note: wind curtailment figures were based on a model with generic wind profiles and are not necessarily a prediction of what the actual wind curtailment will be in future years
2010
2011
2012
2013
2014
West/ North Curtailment
18.4%
17.1%
18.7%
0.66%
0.60%
South Curtailment
0.02%
0.16%
0.07%
0.00%
Total Curtailment
17.3%
15.8%
0.61%
0.55%
November 13, 2009
RPG Meeting

5. Initial reliability analysis done in UPLAN which is DC
2009 5YTP AC Cases
Why create an AC case?
Initial reliability analysis done in UPLAN which is DC
Overloads may exist when VAR flow is added
Voltage analysis required
UPLAN cannot run some contingencies (ie. multi-section line with load throwover)
Other studies use 5YTP cases for analysis
Reliability cases
Start with 5YTP conditioned cases for each year
Add all reliability projects
Run Powerworld SCOPF to create a security constrained dispatch
Add additional projects for unresolvable constraints
November 13, 2009
RPG Meeting

6. ERCOT will use the 5YTP as demonstration of this assessment
2009 5YTP AC Cases
5YTP Voltage Analysis
NERC TPL Standards require the Planning Authority (ERCOT) and Transmission Planner to (summarization):
Annually perform a near term (years one through five) assessment of the transmission system that…
Includes reactive power resources to ensure that adequate reactive resources are available to meet system performance and…
Address any planned upgrades needed to meet the performance requirements of Category B of Table I
ERCOT will use the 5YTP as demonstration of this assessment
November 13, 2009
RPG Meeting

7. Complete feedback from TOs/ Market Participants Documentation
2009 5YTP Next Steps
Finalize AC cases
Complete feedback from TOs/ Market Participants
Documentation
Analyze YTP successes and areas for improvement
Incorporate into YTP
Please send comments to j bill cot.co m
(remove spaces)
November 13, 2009
RPG Meeting

8. Questions?
November 13, 2009
RPG Meeting