sced re-runs: before and after non-spin deployment on july 13 & july 18
DESCRIPTION
SCED Re-Runs: Before And After Non-Spin Deployment on July 13 & July 18. John Dumas Director Wholesale Market Operations. Outline of Presentation. Additional Data from July 13 & 18 Non-Spin Deployment. Results of SCED Re-Run for different “floor” scenarios. Limitations of the SCED Re-Run - PowerPoint PPT PresentationTRANSCRIPT
August 8, 2011
Reliability Deployments Task Force Meeting
SCED Re-Runs: Before And After
Non-Spin Deployment on July 13 & July 18
John DumasDirector Wholesale Market Operations
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Outline of Presentation
• Additional Data from July 13 & 18 Non-Spin Deployment.
• Results of SCED Re-Run for different “floor” scenarios.• Limitations of the SCED Re-Run
• QSE actions to submit EOC with floor for Non-Spin
• Summary of the SCED Re-Run
• Observations
August 8, 2011
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Additional Data from July 13 Non-Spin Deployment.
July 28, 2011
@14:35 LSL Non-Spin Responsibility“ON” Non-QSGR 2247 649
“OFFNS” Non-QSGR 104 251
“ON” QSGR 433 844
“OFFNS” QSGR 219 291
“OFF” Non-QSGR that came online by 14:55
56 0
“OFF” QSGR that came online by 14:55
144 0
•Note 1: All are telemetry values at 14:35 (before Non-Spin Deployment)
•Note 2: Load increase from 14:35 to 14:55 = 540 MW
•Note 3: LSL injection from OFFNS resources from 14:35 to 14:55 =
219 (“OFFNS” QSGR) + 104 (“OFFNS” Non-QSGR) = 323 MW•Note 4: The total HSL from “OFF” Generation Resources that came online = 248 MW
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Additional Data from July 18 Non-Spin Deployment.
July 28, 2011
@14:35 LSL Non-Spin Responsibility“ON” Non-QSGR 1636 738
“OFFNS” Non-QSGR 116 358
“ON” QSGR 258 536
“OFFNS” QSGR 288 368
“OFF” Non-QSGR that came online by 14:55
0 0
“OFF” QSGR that came online by 14:55
0 0
•Note 1: All are telemetry values at 15:20 (before Non-Spin Deployment)
•Note 2: Load increase from 15:20 to 15:55 = 507 MW
•Note 3: LSL injection from OFFNS resources from 15:20 to 15:55 =
288 (“OFFNS” QSGR) + 116 (“OFFNS” Non-QSGR) = 404 MW
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Scenarios for SCED Re-Run with different “floors”
August 8, 2011
• For “ON” Generation Resources (QSGR and Non-QSGR), change HASL/HDL calculation to give SCED ability to ALWAYS use capacity reserved for Non-Spin.
• Re-Run SCED with modified EOC for Generation Resources having Non-Spin Responsibility as per the following:
Low FLoor Medium-1 Floor
Medium-2 Floor
High Floor
ONLINE Non-QSGR:HASL to HSL
18*FIP
July13=$79.38July 18=$80.01
$500 $1000 $3000
ONLINE QSGR:(HSL-Non-Spin) to HSL
18*FIP
July13=$79.38July 18=$80.01
$500 $1000 $3000
OFFNS (QSGR & Non-QSGR):LSL to HSL
15*FIP+$120
July13=$186.15July 18=$186.675
$500 $1000 $3000
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Results of SCED Re-Run for different “floor” scenarios
August 8, 2011
July 13: FIP=4.41 July 18: FIP=4.445
System Lambda@14:35 Before Non-Spin Deployment
System Lambda@14:55 - After Non-Spin Deployment
System Lambda@15:20 Before Non-Spin Deployment
System Lambda@15:55 - After Non-Spin Deployment
Sum(HDL)-GTBD=459 MW (New)= -7 MW (Original)
Sum(HDL)-GTBD=505 MW (New)=505 MW (Original)
Sum(HDL)-GTBD=335 MW (New)=280 MW (Original)
Sum(HDL)-GTBD=1149 MW (New)=1149 MW(Original)
Original – No change
$2999.99 $76.79 $267.75 $63.35
Original – Only online HASL/HDL changed, NO floor
$92.88 $76.79 $62.54 $63.35
Low Floor $81.28 $83.61 $85.08 $80.92
Med Floor-1$500
$500 $500 $475.57 $80.92
Med Floor-2$1000
$1000 $1000 $968.96 $80.92
High Floor$3000
$3000 $3000 $2968.95 $80.93
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Results of SCED Re-Run for different “floor” scenarios
• July 13 : 13:00 – 20:00
August 8, 2011
@14:35GTBD=62261 MW
orig=$2999.99HASL=$92.88low=$81.28med-1=$500med-2=$1000high=$3000
@14:55GTBD=62801 MW
orig=$76.79HASL=$76.79low=$83.61med-1=$500med-2=$1000high=$3000
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Results of SCED Re-Run for different “floor” scenarios
• July 18 : 13:00 – 20:00
August 8, 2011
@15:55GTBD=61677 MW
orig=$63.35HASL=$63.35low=$80.92med-1=$80.92med-2=$80.92high=$80.93
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Limitations of the SCED Re-Run
August 8, 2011
• In Production, the additional EOC available to SCED after Non-spin deployment pushed down the output of other Generation Resources not carrying any Non-Spin Responsibility.
• The SCED re-runs used the Production telemetered MW. The telemetered MW would have been different if the floor were applied ALL of the time.
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QSE actions to submit EOC with floor for Non-Spin
• No change to QSE process of submitting EOC and AS offers to DAM
• No change to QSE process of submitting AS offers to SASM
• QSE will update EOC to incorporate floor before the end of the Adjustment Period.
– With the ability provided by NPRR 321 “Allow Change to Energy Offer Curve MW Amounts in the Adjustment Period”,
August 8, 2011
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Summary of the SCED Re-Run
• After Non-Spin deployment, if the “floored” EOC segments are marginal, then the LMPs will be at the floor – i.e. LMPs are administered - by the value of the floor.
• After Non-Spin deployment, if none of the “floored” EOC segments are awarded, then the Generation Resources providing Non-Spin will be at risk of being price-takers at their LDL.
• Floors over or under compensate relative to prices without Non-Spin deployment.
August 8, 2011
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Observations
• ERCOT did not over deploy Non-Spin on July 13 and July 18.– Sum(HDL)-GTBD <200– Load growth exceeded the remaining Non-Spin deployed
• Is the impact to the Day-Ahead and Real-Time energy price convergence because of permanently allowing SCED to use Non-Spin capacity mitigated by the floor on the Non-Spin segment of the EOC?
• ERCOT procedure to deploy Non-Spin will need to be reviewed if the Non-Spin capacity is permanently made available to SCED.
August 8, 2011