april 16, 2010 rpg meeting lamesa area upgrades ercot independent review jeff billo
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April 16, 2010
RPG Meeting
Lamesa Area UpgradesERCOT Independent Review
Jeff Billo
RPG Meeting April 16, 2010 2
Lamesa RPG Review History
• Three wind plants totaling 588 MW capacity signed IAs to interconnect to the 186 MVA Lamesa-China Grove 138-kV line between Q3 2007 and Q1 2009
• Gunsight wind plant signed IA to interconnect 120 MW to Ackerly Vealmoor-Getty Vealmoor 138-kV line in Q4 2007
RPG Meeting April 16, 2010 3
Lamesa RPG Review History
• Oncor submitted upgrade project to RPG in Q4 2007 to relieve congestion
– ERCOT analysis did not show enough economic benefit to justify cost of upgrades pre-CREZ
– Concluded that project should wait until more known about CREZ and how to integrate with CREZ
– Oncor withdrew project from RPG review
• Two of the three wind plants on the Lamesa-China Grove line cancelled IAs leaving only the 180 MW Bull Creek plant which is currently interconnected at the Willow Valley station
• Oncor resubmitted the Tier 1 RPG project with CREZ integration in Q4 2008
• ERCOT recommended Ackerly Vealmoor-Lamesa 69-kV line be upgraded and 138-kV double circuit capable as a reliability upgrade as part of the Permian Basin RMR exit strategy in Q3 2009
• ERCOT analyzed during the 2009 5YTP but did not see enough economic benefit to justify cost of additional upgrades
• ERCOT continued to analyze alternative upgrades after the 2009 5YTP
RPG Meeting April 16, 2010 4
Lamesa Area Upgrades – ERCOT Independent Review
• ERCOT analyzed submitted project and alternatives using 2009 5YTP final 2014 case
– Removed Bluff Creek-China Grove 138-kV line upgrade
• Leading alternate proposal– Concept:
• Reconfigure Willow Valley station to direct power from Bull Creek plant onto CREZ system
• Add Ackerly Vealmoor-Lamesa 138-kV circuit to complete 138-kV loop and relieve congestion on Ackerly Vealmoor 138/69-kV transformer
– Rebuild portion of Willow Valley-Lamesa 138-kV line (from Willow Valley to point where Long Draw-Grelton 345-kV CREZ line crosses the line) as double circuit 138-kV line
• Create 138-kV circuit from Willow Valley to Long Draw by utilizing new double circuit and the open position on the Long Draw-Grelton towers
– Reconfigure Willow Valley substation so that Gail-Exxon Sharon 138-kV line no longer passes through station
– Add 138-kV bus and 345/138-kV autotransformer at Long Draw
– Add Lamesa-Ackerly 138-kV circuit to to-be rebuilt 69-kV line
RPG Meeting April 16, 2010 5
Lamesa Area Upgrades Alternative Proposal
RPG Meeting April 16, 2010 6
Willow Valley Reconfiguration - Conceptual
To Bull Creek
To Exxon SharonTo Gail
Before
To Bull Creek
To Exxon SharonTo Gail
After
To Long Draw
RPG Meeting April 16, 2010 7
Lamesa Area Upgrades – Performance
• Production Cost Savings– Submitted project: $2.35 M
– Alternate project: $6.51 M
• Estimated Capital Cost
– Submitted project: $65 M (after taking into account already approved projects)
– Alternate project: $31.9 M
• Capital cost to Annual Production Cost Savings Ratio
– Submitted project: 27.7 – does not pass economic criteria
– Alternate project: 4.9 – passes economic criteria
RPG Meeting April 16, 2010 8
Lamesa Area Upgrades
• Other considerations
– Alternative project does not change the interconnection of Bull Creek plant but will change how power from Bull Creek plant flows on system
• Project justification is based on societal benefit
– CREZ Long Draw-Sand Bluff 345-kV towers may be lower cost compared to Long Draw-Grelton towers for Willow Valley-Long Draw 138-kV circuit
• At time of analysis Long Draw-Sand Bluff 345-kV line routing options were not public
• ERCOT IR will leave this option open to Oncor and WETT
• Next Step
– Finalize ERCOT Independent Review Report and prepare Recommendation Letter
• Final project will be Tier 2
RPG Meeting April 16, 2010 9
Questions?
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