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Operations Reports

Daily Grid Operations Report
09/01/2008

Peak Load 53243
Peak Hour 17
Planned Peak 55182
Planned Peak Hour 17

Constraints Encountered During the Day

Start Constraint Reason
00:15 OOMC Stryker Creek 1 Loss of Elkton - Tricorner - Martin Lake 345kV overloads Tyler Northeast - Delek POI 138KV - 115% of 244 MVA rating.
11:15 OOME Stryker Creek 1 up Loss of Elkton - Tricorner - Martin Lake 345kV overloads Tyler Northeast - Delek POI 138KV - 106% of 244 MVA rating.
11:30 OOME Laredo up Laredo Import limit 350 MW, actual 280 MW - 80%
13:00 OOME Decker up Loss of Austrop 345/138KV autotransformer #2 overloads Austrop 345/138KV autotransformer #1 - 104% of 480 MVA rating.
14:15 Odessa EHV Transformer OC3 Loss of Odessa EHV 345/138KV autotransformer T2 overloads Odessa EHV 345/138KV autotransformer T1 - 103% of 520MVA rating.
15:15 Trinidad - Stryker Creek - Mount Enterprise OC3 Loss of Trinidad -Stryker Creek - Mount Enterprise 345KV overloads Southeast  Nacogdoches 345/138KV transformer - 103% of 512 MVA rating.
16:00 OOMC Permian Basin Alert for projected capacity shortage.
17:00 OOMC Handley Alert for projected capacity shortage.

Other Notable Events

Start End Event
00:15 24:00 Alert Level Yellow Elevated
00:15 23:20 Advisory issued due to Hurricane Gustav in the Gulf of Mexico.
10:05 12:05 Operating Condition Notice (OCN) issued due to a projected capacity shortage for hour ending 1600 - 1800.
11:07 11:20 Deployed 323 MW of Responsive Reserve Service from actual adjusted Responsive Reserve of 4372 MW with an obligation of 2300 MW when frequency dropped to 59.908 HZ due to XXXX trip with 300 MW.  ERCOT load 44116 MW.
12:05 17:42  Alert issued due to a projected capacity shortage for hour ending 1600 - 1800.
12:45 17:42 Advisory issued due to adjusted Responsive Reserve below 3000 MW.
15:00 17:00 Deployed Non-Spin Reserve Service in the South and Houston Zones.
17:18 17:23 Deployed 323 MW of Responsive Reserve Service from actual adjusted Responsive Reserve of 3400 MW with an obligation of 2300 MW when frequency dropped to 59.847 HZ due to XXXX trip with 610 MW.  ERCOT load 53169 MW.