CREZ Transmission Optimization Study

August 24, 2007ERCOT Regional Planning Group Meeting

CREZ Transmission Optimization Study

Warren LasherSystem Assessment

ERCOT Regional Planning Group MeetingAugust 24, 2007

Looking for 8

PUC Docket No. 33672• Began in January 2007

• Parties nominated CREZs and demonstrated financial commitment

– Most proposed CREZs based on the areas developed in the AWS Truewind study

• TSPs and potential TSPs put forth alternate transmission solutions

• Hearing on Merits held June 11-15• Decision on CREZ reached in late

July; written order has not yet been issued, so some details are still unclear


Your Mission, If You Choose to Accept It…

Capacity of New CREZ Wind by Scenario (MW)

Wind Zone

Scen. 1

Scen. 2

Scen. JP

Scen. 3

1, 2 1,274 2,917 6,000 4,560

4 1,039 2,380 0 3,720

5, 6 807 1,849 3,000 2,890

9, 10 1,457 3,336 5,000 5,215

19 573 1,312 0 2,051

Total 5,150 11,794 14,000 18,436

Subject To

Change


The Process

• Will be conducted similar to the Regional Planning Group process, on fast-forward

• Frequent meetings will be held to discuss options, modeling, and results

• First meeting is scheduled for August 31 at the MET Center

• The RPG – CREZ mailing list will be used to distribute information associated with the study

• Participants will be expected to propose alternatives and to review each other’s proposed solutions

• Transmission solutions will be developed for the four scenarios outlined in the Interim Order

– Higher-penetration scenario(s) will require some pre-work

• ERCOT will perform the independent assessment


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

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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

Aug. 31 Feb. 15


Project Timeline

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



Stability Analysis


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Review Results



Aug. 31 Feb. 15

Develop and Evaluate Options for Collecting Wind Generation In CREZ Areas

• Survey stakeholders for proposals• Develop multiple collection options for all 4 scenarios• Will require discussion of direct connection issues within a CREZ


Project Timeline

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



Stability Analysis


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Review Results



Aug. 31 Feb. 15

ID Cong-ested Elements

ID Potential System Solutions

Evaluate Solutions

Review results

Revise Solutions

Iterate this process until solutions are optimized

Develop System-Wide Improvements(Scenarios 1, 2, and JP)


Project Timeline

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



Stability Analysis


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Review Results



Aug. 31 Feb. 15

The higher wind scenario(s) may require a modified evaluation process

– May not be sufficient load in 2012 case to absorb the higher scenario(s) level of wind generation

– Review generation operating assumptions


Project Timeline

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



Stability Analysis


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Review Results



Aug. 31 Feb. 15

Draft Results of the Ancillary Services study are expected in

November

Stability studies on scenarios 1 and 2 are expected to take 6

weeks


Base Cases – Strawman Proposal

• Base transmission topology will be developed from the final year (2012) of the current Five-Year Plan– Latest Validated Case available

– Derived from the 2007 SSWG Dataset B case

– System Peak Load of 78,355 MW

• Wind patterns developed from AWS Truewind study• Gas price: $7.00/MMBtu (delivered)• Generation Fleet: Operating units and units with

signed interconnection agreements• As noted, the higher wind scenarios may require a

modified evaluation process. Generation operations assumptions and load levels will be reevaluated for these scenarios.


August 31st Meeting Topics

• Discussion of direct connection and hub(s) placement

• Discussion of alternative “on-ramp” options• List of issues


On Your Mark…

• Sign up for the RPG - CREZ list at http://Lists.Ercot.com.

• Let me know if you have any questions ([email protected])

• Please participate in the process

Questions or Comments?

CREZ Transmission Optimization Study

Documents

Transcript of CREZ Transmission Optimization Study