Daily Grid Operations Report
Wednesday, June 24, 2009

Peak Load 61,641
Peak Hour 17
Planned Peak 62,450
Planned Peak Hour 17

Constraints Encountered During the Day

Start Constraint Reason
00:15 VDI's to McCamey Area Loss of Crane LCRA - Odessa EHV 138Kv overloads Comanche Creek - Fort Stockton 138KV. 
00:30 OOME Bosque down Loss of Tradinghouse SES - Venus Switch 345KV overloads Rogers Hill - Bosque Switch 138KV - 102% of 217 MVA rating.
01:45 Tradinghouse SES - Venus Switch OC3 Loss of Tradinghouse SES - Venus Switch 345KV overloads Rogers Hill - Bosque Switch 138KV - 108% of 217 MVA rating.
11:15 OOMC/OOME Laredo up Loss of Dilley Switch - San Miguel Switch 138KV overloads Derby - Pearsall 69KV - 100% of 40 MVA rating.
11:45 OOME Ferguson up Loss of Kendall 345/138KV transformer T2 overloads Raymond F. Barker 138/69KV Autotransformer - 110% of 45 MVA rating.
12:15 OOMC/OOME Rayburn up Loss of Sam Rayburn Switch 138/69KV transformer overloads Warburton 138/69KV transformer - 106% of 40 MVA rating.
13:15 OOME Deerpark Energy down Loss of Chambers - King & Cedar Bayou - Northbelt 345KV overloads Center  - PH Robinson 345KV - 109% of 1195 MVA rating.
14:45 Temple Pecan Creek - Tradinghouse & Temple Switch - Lake Creek OC3 Loss of Temple Pecan Creek - Tradinghouse and Temple Switch - Lake Creek 345KV overloads Waco West - Waco Woodway 138KV - 102% of 211 MVA rating.
15:15 OOME Odessa Ector down Loss of Morgan Creek - Quail Switch - Longshore Switch 345KV overloads Stanton - Midland East 138KV - 127% of 89 MVA rating.
15:30 North - South OC1 Limit 938, Actual 1031 - 110%.  Loss of Temple Pecan Creek - Tradinghouse and Temple Switch - Lake Creek 345KV overloads Waco Woodway - Waco Atco 138KV.
16:45 OOME Olinger down Loss of Olinger -  Ben Davis & Elm Grove 138KV overloads Olinger - Swindell 138KV - 124% of 218 MVA rating.
18:30 OOME Deer Park Energy Center down Loss of Chambers - King & Cedar Bayou - Northbelt 345KV overloads Center - PH Robinson 345KV - 106% of 1195 MVA rating.

Other Notable Events

Start End Event
00:15 24:00 Physical and Cyber Threat Alert Levels - Elevated (yellow)
15:15 18:00 Deployed Non-Spin Reserve Service in the South Zone due to the depletion of Up Balancing Energy Service.
15:30 18:00 Deployed Non-Spin Reserve Service in the Houston, North and West Zones due to the depletion of Up Balancing Energy Service.