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Table B.1. Major Disturbances and Unusual Occurrences, Year-to-Date through August 2009 |
| Date |
Utility/Power Pool (NERC Region) |
Time |
Area Affected |
Type of Disturbance |
Loss (megawatts) |
Number of Customers Affected [1] |
Restoration |
| January |
| 1/5/2009 |
Oncor Electric Delivery Company, LLC (TRE) |
5:00 a.m. |
North and Central Texas |
Severe Storm |
N/A |
157,019 |
6:00 p.m. January 06 |
| 1/7/2009 |
Duke Energy Carolinas (SERC) |
5:00 p.m. |
Piedmont of North and South Carolina |
High Winds |
300 |
70,000 |
8:05 p.m. January 07 |
| 1/8/2009 |
Florida Keys Electric Cooperative Assoc. Inc. (FRCC) |
11:46 p.m. |
Florida Keys |
Transmission Equipment Failure |
55 |
31,000 |
11:25 a.m. January 09 |
| 1/17/2009 |
State Line Energy, LLC (RFC) |
8:00 a.m. |
PJM, Indiana |
Fuel Supply Deficiency |
N/A |
N/A |
8:00 a.m. January 25 |
| 1/22/2009 |
Crawfordsville Electric Light and Power (RFC) |
4:00 p.m. |
Crawfordsville, Indiana |
Shed Load |
50 |
9,700 |
5:05 p.m. January 22 |
| 1/27/2009 |
Louisville Gas and Electric/Kentucky Utilities (RFC) |
5:00 a.m. |
State of Kentucky |
Ice Storm |
N/A |
383,000 |
4:30 p.m. January 29 |
| 1/27/2009 |
East Kentucky Power Cooperative, Inc. (SERC) |
5:03 a.m. |
Central and Eastern Kentrucky |
Ice Storm |
600 |
190,000 |
5:15 p.m. January 31 |
| 1/27/2009 |
Big Rivers Electric Corporation (SERC) |
7:10 a.m. |
Western Kentucky and Southern Indiana |
Ice Storm |
350 |
3 |
7:30 p.m. February 04 |
| 1/27/2009 |
Associated Electric Cooperative, Inc. (SERC) |
11:00 a.m. |
South Central and Southeast Missouri |
Winter Storm |
200 |
62,500 |
6:00 p.m. January 30 |
| 1/27/2009 |
Entergy Corporation (SERC) |
1:46 p.m. |
Northern Arkansas |
Ice Storm |
N/A |
111,818 |
5:00 p.m. February 03 |
| 1/27/2009 |
American Electric Power (RFC) |
3:43 p.m. |
CSWS-AEP West |
Ice/Snow Storm |
N/A |
59,402 |
9:00 a.m. January 29 |
| 1/27/2009 |
Arkansas Electric Cooperative Corporation (SERC) |
9:00 p.m. |
Northern Arkansas |
Ice Storm |
600 |
215,700 |
6:00 a.m. January 29 |
| 1/27/2009 |
Tennessee Valley Autbority (SERC) |
9:45 p.m. |
TVA Service Territory |
Ice Storm |
850 |
1 |
10:17 p.m. January 27 |
| 1/28/2009 |
Midwest ISO (RFC) |
12:10 a.m. |
East Central Missouri |
Winter Storm |
300 |
1 |
9:20 p.m. January 30 |
| 1/28/2009 |
Midwest ISO (RFC) |
3:00 a.m. |
Illinois, Indiana, Ohio and Kentucky |
Winter Storm |
N/A |
230,300 |
8:03 a.m. February 13 |
| 1/28/2009 |
Henderson Municipal Power and Light (RFC) |
4:00 a.m. |
City of Henderson, Kentucky and Portions of Henderson County, Kentucky |
Ice Storm |
21 |
3,500 |
5:00 p.m. February 07 |
| 1/28/2009 |
Vectren Energy Delivery of Indiana (RFC) |
6:00 a.m. |
Indiana, Evansville, Metro Area |
Ice Storm |
506 |
75,000 |
6:00 p.m. February 05 |
| 1/28/2009 |
Duke Energy Indiana (RFC) |
7:50 a.m. |
Southern Indiana |
Ice/Snow Storm |
N/A |
53,700 |
8:03 a.m. February 13 |
| 1/28/2009 |
Tennessee Valley Authority (SERC) |
9:00 a.m. |
Northeast Tennessee and Southwest Kentucky |
Ice Storm |
N/A |
109,527 |
8:00 a.m. February 05 |
| 1/28/2009 |
Duke Energy Ohio (RFC) |
10:00 a.m. |
Northern Kentucky and Southwest Ohio |
Ice/Snow Storm |
N/A |
53,600 |
9:20 p.m. January 30 |
| February |
| 2/11/2009 |
CenterPoint Energy (TRE) |
2:30 a.m. |
Houston, Texas |
High Winds |
350 |
64,801 |
12:00 p.m. February 11 |
| 2/11/2009 |
American Electric Power (RFC) |
6:00 p.m. |
Kentucky, West Virginia and Ohio |
Severe Thunderstorms |
N/A |
279,813 |
5:00 p.m. February 13 |
| 2/11/2009 |
Allegheny Power (RFC) |
6:18 p.m. |
Maryland, Virginia, West Virginia and Pennsylvania |
Severe Thunderstorms |
N/A |
374,644 |
8:10 p.m. February 16 |
| 2/11/2009 |
Louisville Gas and Electric/Kentucky Utilities (RFC) |
7:00 p.m. |
State of Kentucky |
Severe Thunderstorms |
N/A |
78,000 |
11:00 a.m. February 12 |
| 2/11/2009 |
Midwest ISO (RFC) |
9:00 p.m. |
Northern Kentucky and Southwest Ohio |
Severe Thunderstorms |
350 |
63,000 |
12:00 p.m. February 12 |
| 2/12/2009 |
Midwest ISO (RFC) |
2:30 a.m. |
Central and Eastern Ohio |
High Winds |
168 |
184,000 |
6:00 a.m. February 12 |
| 2/12/2009 |
Penelec (RFC) |
8:00 a.m. |
Western and North Eastern Pennsylvania |
High Winds |
130 |
132,000 |
10:00 p.m. February 15 |
| 2/13/2009 |
Ohio Edison Company (RFC) |
2:30 a.m. |
Central and Eastern Ohio |
High Winds |
168 |
184,000 |
3:00 a.m. February 15 |
| 2/23/2009 |
Central Maine Power Company (NPCC) |
2:38 a.m. |
Southern Central and Western Maine |
Ice/Snow Storm |
N/A |
131,000 |
1:46 p.m. February 24 |
| March |
| 3/1/2009 |
El Paso Electric Company (WECC) |
12:15 a.m. |
City of El Paso, Texas, County of El Paso |
Transmission Equipment Failure |
250 |
132,000 |
3:00 a.m. March 01 |
| 3/1/2009 |
Southern Company (SERC) |
4:00 p.m. |
Southern Balancing Area |
Severe Weather |
75 |
60,000 |
11:25 p.m. March 01 |
| 3/1/2009 |
Duke Energy Carolinas (SERC) |
8:54 p.m. |
Duke Energy Carolinas Balance Authority |
Ice/Snow Storm |
1,000 |
180,000 |
4:06 p.m. March 03 |
| 3/1/2009 |
Dominion Virginia/North Carolina Power (SERC) |
10:00 p.m. |
Central Virginia - Spotsylvania County |
Winter Storm |
210 |
217,000 |
6:00 p.m. March 03 |
| 3/3/2009 |
New Covert Generating Company, LLC (RFC) |
6:48 a.m. |
Southwest Michigan |
Transformer Faulted/Unit Tripped |
378 |
N/A |
6:05 a.m. April 26 |
| 3/3/2009 |
American Electric Power (REC) |
10:00 p.m. |
Roanoke, Virginia |
Made Public Appeals |
350 |
0 |
8:17 p.m. March 04 |
| 3/8/2009 |
Crockett Cogeneration (WECC) |
10:16 p.m. |
San Francisco Bay Area, California |
Unit Shut Down |
150 |
- |
11:45 p.m. March 08 |
| April |
| 4/6/2009 |
Consumers Energy (RFC) |
1:00 a.m. |
Michigan, Lower Peninsula |
Winter Storm |
75 |
70,793 |
12:00 p.m. April 08 |
| 4/10/2009 |
Southern Company (SERC) |
10:00 p.m. |
Alabama and Georgia |
Severe Thunderstorms |
162 |
56,679 |
2:30 a.m. April 11 |
| 4/23/2009 |
State of California, Department of Water Resources (WECC) |
12:00 a.m. |
Restricted Hydro Electric Capability |
Fuel Supply Deficiency |
- |
- |
Ongoing |
| 4/23/2009 |
Puget Sound Energy (WECC) |
4:25 p.m. |
Skagit County, Washington |
Transmission Tripped |
244 |
93,300 |
12:29 a.m. April 24 |
| 4/23/2009 |
Southern California Edison Co (WECC) |
5:54 p.m. |
Communities of Elsinore, Hemet, Moreno Valley, Perris, San Jacinto and Temecula in the southeastern area of Riverside County in California |
Substation Load Interruption |
512 |
280,000 |
7:58 p.m. April 23 |
| 4/24/2009 |
Constellation Energy (SERC) |
11:09 a.m. |
Ruston, Louisiana |
Complete Electric System Failure |
32 |
11,000 |
11:21 a.m. April 24 |
| 4/25/2009 |
Detroit Edison (RFC) |
2:30 p.m. |
Western Region of Service Territory |
High Winds/Rain |
N/A |
125,000 |
1:00 a.m. April 29 |
| 4/27/2009 |
CenterPoint Energy (TRE) |
3:30 p.m. |
Greater Houston/Galveston Area |
High Winds |
176 |
158,000 |
11:30 a.m. April 28 |
| May |
| 5/8/2009 |
The Empire District Electric Company (SERC) |
7:30 a.m. |
SW Missouri |
Severe Thunderstorm |
266 |
83,000 |
9:00 a.m. May 08 |
| 5/8/2009 |
Ameren (SERC) |
1:30 p.m. |
Southern Illinois |
Severe Thunderstorm |
300 |
68,800 |
11:20 p.m. May 14 |
| 5/29/2009 |
Big Rivers Electric Corporation (SERC) |
9:05 a.m. |
Henderson County, Kentucky |
Transmission Equipment Failure |
342 |
1 |
7:57 p.m. May 29 |
| June |
| 6/5/2009 |
Pacific Gas and Electric (WECC) |
1:38 p.m. |
East of Fresno California |
Electrical System Separation |
1 |
70 |
8:18 p.m. June 05 |
| 6/9/2009 |
Baltimore Gas and Electric (RFC) |
5:25 p.m. |
Central Maryland |
Severe Thunderstorms |
60 |
85,091 |
5:00 a.m. June 11 |
| 6/10/2009 |
Oncor Electric Delivery Company, LLC (TRE) |
6:00 p.m. |
North and Central Texas |
Severe Storms |
N/A |
800,000 |
10:00 a.m. June 14 |
| 6/12/2009 |
Tennessee Valley Authority (SERC) |
4:37 p.m. |
Chattanooga, Tennessee |
Severe Storm |
860 |
136,000 |
6:53 p.m. June 12 |
| 6/12/2009 |
Entergy Corporation (SERC) |
5:45 p.m. |
Arkansas, North Mississippi |
Severe Thunderstorms |
N/A |
81,645 |
11:59 p.m. June 15 |
| 6/12/2009 |
Southern Company (SERC) |
10:00 p.m. |
Georgia |
Severe Thunderstorm |
290 |
102,000 |
6:00 p.m. June 13 |
| 6/16/2009 |
California Department of Water Resources (WECC) |
11:00 p.m. |
A.D. Edmonston Pumping Plant |
Fuel Supply Deficiency |
300 |
0 |
2:00 a.m. June 17 |
| 6/19/2009 |
Consumers Energy (RFC) |
12:01 a.m. |
Michigan Lower Peninsula |
Severe Storm |
75 |
99,000 |
11:00 p.m. June 21 |
| 6/19/2009 |
Exelon Corporation ComEd (SERC) |
1:00 p.m. |
The Entire ComEd Service Territory |
Severe Storm |
N/A |
245,000 |
11:59 p.m. June 19 |
| 6/24/2009 |
SW Louisiana Electric Membership Corp/ Louisiana Generating LLC (SERC) |
1:30 p.m. |
Southwest Louisiana |
Made Public Appeals |
N/A |
N/A |
10:00 p.m. June 24 |
| 6/25/2009 |
ERCOT ISO (TRE) |
3:16 p.m. |
ERCOT Region |
Made Public Appeals |
N/A |
N/A |
7:00 p.m. June 25 |
| 6/25/2009 |
Detroit Edison (RFC) |
3:30 p.m. |
Western Region of Service Territory |
High Winds/Rain |
N/A |
118,000 |
8:00 p.m. June 28 |
| 6/26/2009 |
Duke Energy Midwest (RFC) |
1:00 a.m. |
Southwest Ohio, Northern Kentudky, Central and Southern Indiana |
Severe Thunderstorms |
327 |
85,000 |
9:00 a.m. June 27 |
| 6/26/2009 |
Connecticut Light and Power (NPCC) |
5:00 p.m. |
Central Connecticut |
Severe Thunderstorms |
N/A |
50,752 |
9:00 a.m. June 29 |
| July |
| 7/2/2009 |
ISO New England (NPCC) |
10:44 p.m. |
Northern Maine |
Electrical System Separation |
0 |
0 |
1:25 a.m. July 03 |
| 7/7/2009 |
ERCOT ISO (TRE) |
3:30 p.m. |
San Antonio, Texas |
Made Public Appeals |
N/A |
N/A |
7:00 p.m. July 07 |
| 7/8/2009 |
ERCOT ISO (TRE) |
1:30 p.m. |
ERCOT Region |
Made Public Appeals |
N/A |
N/A |
7:00 p.m. July 08 |
| 7/14/2009 |
AEP West (SPP) |
1:00 p.m. |
AEP SWEPCO/Louisiana Area |
Made Public Appeals |
N/A |
N/A |
6:00 p.m. July 14 |
| 7/15/2009 |
AEP West (SPP) |
1:00 p.m. |
AEP SWEPCO/Louisiana Area |
Made Public Appeals |
N/A |
N/A |
6:00 p.m. July 15 |
| 7/16/2009 |
AEP West (SPP) |
1:00 p.m. |
AEP SWEPCO/Louisiana Area |
Made Public Appeals |
N/A |
N/A |
6:00 p.m. July 16 |
| 7/18/2009 |
CenterPoint Energy (TRE) |
7:00 p.m. |
Houston/Galveston Area |
Thunderstorms |
51 |
73,000 |
9:00 p.m. July 19 |
| 7/20/2009 |
Public Service Company of Colorado (WECC) |
9:50 p.m. |
Metro Denver (Jefferson, Adams, and Arapahoe Counties) |
Severe Thunderstorm |
150 |
86,058 |
7:00 p.m. July 22 |
| 7/21/2009 |
Crockett Cogeneration (WECC) |
5:34 a.m. |
San Francisco Bay Area, California |
Unit Tripped |
136 |
1 |
8:43 a.m. July 21 |
| 7/27/2009 |
Tennessee Valley Authority (SERC) |
5:05 a.m. |
Chattanooga, Tennessee |
Failure of Computer Hardware Used for Monitoring |
N/A |
N/A |
5:47 a.m. July 27 |
| 7/28/2009 |
PacificCorp (WECC) |
8:18 p.m. |
Salt Lake City Utah and Northern Utah |
Loss of Part of Substation |
316 |
N/A |
8:33 p.m. July 28 |
| August |
| 8/2/2009 |
PECO Energy (RFC) |
2:17 a.m. |
Chester, Montgomery, Delaware, Philadelphia and Bucks Counties, Pennsyvania |
Highwinds |
N/A |
70,264 |
1:09 p.m. August 03 |
| 8/4/2009 |
Duke Energy Midwest (RFC) |
1:45 p.m. |
Northern Kentucky, Southwest Ohio and Central and South Indiana |
Thunderstorms |
50 |
63,700 |
9:00 p.m. August 08 |
| 8/5/2009 |
ERCOT ISO (TRE) |
3:00 p.m. |
ERCOT Region |
Made Public Appeals |
N/A |
N/A |
7:00 p.m. August 05 |
| 8/7/2009 |
Detroit Edison (RFC) |
11:00 p.m. |
Western Region of Service Territory |
High Winds and Rain |
N/A |
137,000 |
10:00 p.m. August 11 |
| 8/9/2009 |
Consumers Energy (RFC) |
7:31 p.m. |
Michigan, Lower Peninsula |
Severe Thunderstorms |
N/A |
58,156 |
9:59 a.m. August 10 |
| 8/12/2009 |
CenterPoint Energy (TRE) |
6:25 p.m. |
South Houston Service Area |
Thunderstorms |
491 |
73,000 |
10:00 a.m. August 12 |
| 8/21/2009 |
CenterPoint Energy (TRE) |
7:00 p.m. |
Houston Metropolitan Service Area |
Thunderstorms |
544 |
80,000 |
8:00 a.m. August 22 |
| 8/29/2009 |
Western Area Power Administration Upper Great Plains Region (MRO) |
11:00 a.m. |
Western South Dakota |
Electrical System Separation |
373 |
18 |
2:01 p.m. August 29 |
| 8/29/2009 |
Midwest ISO (RFC) |
10:54 p.m. |
Western South Dakota |
Electrical System Separation |
84 |
0 |
11:53 p.m. August 29 |
| 8/31/2009 |
Los Angeles Department of Water and Power (WECC) |
10:31 a.m. |
City of Los Angeles, California |
Made Public Appeals |
N/A |
N/A |
12:00 a.m. August 31 |