2000 Reliability Report from PG&E

General

This is the 2000 Reliability Report for Pacific Gas & Electric Company as required by Decision 96-09-045. It includes four sections:

1. System Indices For The Last 10 Years (1991-2000)

2. Significant Outage Events Of 2000

3. Customers Experiencing >12 Sustained Outages In 2000

4. Historical (1991-1999) Outage Information From Prior Reports

PG&E maintains historical account specific information for customers affected by recorded outages in the Outage reporting system (OUTAGE). This system tracks outages at the generation, transmission, substation, primary distribution, and individual transformer levels. Additionally, OUTAGE models the actual electric switching during the circuit restoration process (which is useful for determining customer outage minutes for calculating SAIDI). PG&E used this data, and information from other data bases, to compile the information contained in this report.

System Indices (1991-2000)

Table 1 lists the required final SAIDI, SAIFI, and MAIFI values for 2000 in accordance with Appendix A of Decision 96-09-045, in addition to the previously reported SAIDI, SAIFI, and MAIFI values from the prior nine years. It should be noted that electric outage notification (EON) devices were installed during 1994-95 to obtain momentary outage information on automatic non-SCADA sectionalizing devices. This deployment accounts for much of the MAIFI increase noted after 1994.

Table 1 - System Indices (1991-2000)

Major Event Included

Major Events Excluded

YEAR

SAIDI

SAIFI

MAIFI

SAIDI

SAIFI

MAIFI

1991

150.1

1.65

1.34

150.1

1.65

1.34

1992

143.3

1.61

1.37

143.3

1.61

1.37

1993

176.7

1.74

1.36

151.6

1.61

1.31

1994

157.7

1.76

1.46

152.9

1.57

1.39

1995

572.4

2.63

1.71

164.9

1.55

1.27

1996

322.5

2.37

6.52

167.5

1.62

6.30

1997

170.6

1.70

4.37

160.9

1.63

4.25

1998

317.3

2.13

3.49

180.1

1.66

3.11

1999

157.3

1.48

2.59

156.8

1.48

2.58

2000

166.9

1.39

2.24

166.4

1.39

2.24

Included in this annual report is supplemental information noted in Tables 2 and 3 representing the corresponding indexes separated for both the distribution and transmission systems. It should be noted that the totals from these two new tables will not exactly match Table 1 for the following reasons:

(a) Generation related outages are included in Table 1;

(b) Table 1 reflects the data available during the preparation of the previous annual reports whereas Tables 2 and 3 reflects the current database.

(c) There are database limitations related to the major event exclusion process when separating the transmission and distribution systems.

Please also note, the MAIFI information is not included in these tables since the existing automatic recording (EON) devices do not distinguish between the two systems.

Table 2 - Distribution System Indices (1991-2000)

^{(Excludes transmission and generation related outages)}

Major Event Included

Major Events Excluded

YEAR

SAIDI

SAIFI

SAIDI

SAIFI

1991

144.6

1.55

144.6

1.55

1992

131.2

1.40

131.2

1.40

1993

159.2

1.54

136.8

1.42

1994

136.4

1.38

136.5

1.38

1995

507.4

2.34

144.8

1.36

1996

188.2

1.59

154.0

1.50

1997

157.4

1.57

148.5

1.51

1998

245.3

1.81

157.4

1.49

1999

145.1

1.33

144.8

1.32

2000

152.0

1.29

151.5

1.28

Table 3 - Transmission System Indices (1991-2000)

^{(Excludes distribution and generation related outages)}

Major Event Included

Major Events Excluded

YEAR

SAIDI

SAIFI

SAIDI

SAIFI

1991

5.2

0.04

5.2

0.04

1992

12.0

0.15

12.0

0.15

1993

17.1

0.13

14.5

0.12

1994

20.5

0.29

17.6

0.15

1995

63.3

0.22

19.9

0.15

1996

133.9

0.71

13.5

0.12

1997

14.0

0.14

13.3

0.13

1998

72.0

0.32

22.6

0.17

1999

12.2

0.16

11.9

0.16

2000

14.8

0.10

14.8

0.10

Significant Outage Events During 2000

Table 4 lists the ten largest outage events experienced during 2000. PG&E interprets this reporting requirement as the ten days (or in some cases consecutive days) with significant number of customer interruptions in the system or portion of the system. These events are listed in order of customer interruptions. As can be seen, all of the ten significant events in 2000 were related to weather conditions. None of these events however met the CPUC definition of a major event.

Table 4 - Ten Largest 2000 Outage Events

Rank	Description	Date	Number of Customers Affected	Longest Customer Interruption (Hours)	Number of People Used To Restore Service	CPUC Major Event?
1	A series of intense storms brought gusty southeast winds, low snow levels, and heavy rain into the Service Area. Wind gusts of 54 mph, 60mph and 74 mph were recorded in Chico, Morro Bay, and Lake Tahoe, respectively.	February 11 - 14	381,581	90	Not requested	No
2	A heat wave coupled with gusty north and northeast winds was experienced during this three-day period. Maximum temperatures on the 14^th included 103 Deg F in downtown San Francisco, 100 Deg F in Oakland, 105 Deg F in Sacramento, 109 Deg F in San Jose, and 115 Deg F in Paso Robles.	June 13 - 15	354,452	97	Not requested	No
3	A strong cold front pushed through the Service Area on Friday, October 20^th. North and Northeast winds developed on Saturday October 21 and Sunday October 22. Gusts in excess of 40 mph occurred in the Central Valley and gusts up to 70 mph occurred in the East Bay hills early Sunday morning.	October 21 - 22	290,777	42	Not requested	No
4	An intense cold front moved through the Redwood Region, Northern Interior, and Bay Area. Numerous showers and thundershowers developed on the 26^th. A funnel cloud was sighted in Richmond, CA on the afternoon of the 26^th.	October 25 - 26	112,426	18	Not requested	No
5	A storm system moved through northern and central sections on January 31^st. Gusty north and northeast winds developed over the Bay Area, Redwood, Northern Interior, and Central Interior in the days after the storm system with the strongest northeast winds occurring overnight from February 2 into the morning of the 3^rd. A gust of 53 mph was reported in Grass Valley and a gust of 41 mph was reported in Bakersfield.	February 03	106,915	17	Not requested	No
6	A storm system brought heavy rain and gusty southeast surface winds to Redwood and the Northern Interior. A gust of 56 mph was recorded at Redding. A gust of 47 mph was recorded at Red Bluff.	January 10 -11	100,236	17	Not requested	No
7	A cold front pushed through Northern and Central Sections on February 18^th. High pressure building into the Great Basin resulted in gusty northeast winds over the coastal hills and the East Bay hills overnight from the 19^th through the morning of the 20^th. Widespread gusts of 35 to 50 mph were recorded including 49 mph at Bakersfield and 40 mph at Fresno and Visalia.	February 20	89,985	24	Not requested	No
8	A cold front affecting principally central and southern zones brought rain and gusty southwest winds to the Service Area. 24-hour precipitation totals included 1.60" at Blue Canyon; 0.86" at Monterey; 0.95" at Fresno. Thunderstorms, accompanied by gusty winds, hail, lightning, and heavy downpours, developed over the Central and Southern San Joaquin Valley.	October 09 - 10	89,288	19	Not requested	No
9	An early season cold front moved through California. Gusty southerly winds with speeds up to 40 mph preceded the frontal passage on September 1. 24-hour precipitation totals set new calendar day records for the date. Totals included 0.99" at Blue Canyon and 2.01" at Redding. Thunderstorms, accompanied by gusty winds, hail, lightning, and heavy downpours, developed over the Central San Joaquin Valley.	September 01	87,250	27	Not requested	No
10	A cold front moved through northern and central portions of the Service Area on the 15^th. Forty-four inches of new snow was reported at Mammoth Lakes. Following frontal passage, northwest winds developed on the 16^th across Redwood, Northern Interior, and Central Interior with gusts exceeding 40 mph. A wind gust of 52 mph was recorded on the 16^th in Humboldt County.	January 16	66,199	16	Not requested	No

Note: Values exclude single distribution line transformer and planned outages

Customers Experiencing > 12 Sustained Outages During 2000

Table 5 lists all circuits where one or more customers on a circuit that experienced more than 12 sustained outages in 2000. Please note, this list does not mean all the customers on the circuit experienced more than 12 outages.

PG&E is addressing the necessary portions of these circuits as part of the overall service reliability improvement plans.

Table 5 - Customers Experiencing > 12 Sustained Outages During 2000

Division

Feeder Name

# Customers

Experiencing > 12 Outages

CENTRAL COAST

WATSONVILLE 2101

1

NORTH VALLEY

CHALLENGE 1101

139

NORTH VALLEY

ESQUON 1101

1

NORTH VALLEY

ESQUON 1102

3

PENINSULA

ALPINE-MENLO 1103

20

SACRAMENTO

GRAND ISLAND 2222

72

SIERRA

ECHO SUMMIT 1101

7

STOCKTON

FROGTOWN 1702

3

YOSEMITE

CANAL 1103

5

YOSEMITE

EL NIDO 1103

22

Total - 273

Historical (1991-1999) Outage Information From Prior Reports

For easy reference, Attachment 1 contains copies of service reliability report information previously submitted for 1991 through 1999.

Attachment 1

Historical (1991-1999) Outage Information From Prior Reports


	Major Event Included			Major Events Excluded
YEAR	SAIDI	SAIFI	MAIFI	SAIDI	SAIFI	MAIFI
1991	150.1	1.65	1.34	150.1	1.65	1.34
1992	143.3	1.61	1.37	143.3	1.61	1.37
1993	176.7	1.74	1.36	151.6	1.61	1.31
1994	157.7	1.76	1.46	152.9	1.57	1.39
1995	572.4	2.63	1.71	164.9	1.55	1.27
1996	322.5	2.37	6.52	167.5	1.62	6.30
1997	170.6	1.70	4.37	160.9	1.63	4.25
1998	317.3	2.13	3.49	180.1	1.66	3.11
1999	157.3	1.48	2.59	156.8	1.48	2.58
2000	166.9	1.39	2.24	166.4	1.39	2.24

Division	Feeder Name	# Customers Experiencing > 12 Outages
CENTRAL COAST	WATSONVILLE 2101	1
NORTH VALLEY	CHALLENGE 1101	139
NORTH VALLEY	ESQUON 1101	1
NORTH VALLEY	ESQUON 1102	3
PENINSULA	ALPINE-MENLO 1103	20
SACRAMENTO	GRAND ISLAND 2222	72
SIERRA	ECHO SUMMIT 1101	7
STOCKTON	FROGTOWN 1702	3
YOSEMITE	CANAL 1103	5
YOSEMITE	EL NIDO 1103	22