measuring electric service...

Measuring Electric Service

Reliability

Office of Public Accountability/

Ratepayer Advocate City of Los Angeles

[email protected] tel. 213-978-0220

July 24, 2018

Typical Utility Definitions of Service Reliability

• To track system performance, the electric utility industry has developed standard measures of reliability: – SAIFI (system average interruption frequency index)

• Represents the number of times the utility’s average customer experienced a sustained power interruption (over five minutes) in a given year.

– SAIDI (system average interruption duration index) • Measures the number of minutes of sustained interruptions (in

minutes) the utility’s average customer experienced in a given year. – CAIDI (customer average interruption duration index)

• Measures the average interruption duration that any given customer would experience. CAIDI can also be viewed as the average restoration time.

– MED (major event days) • Some days are selectively excluded from SAIFI, SAIDI, and CAIDI

statistics in some versions of reporting, based on the severity of outages on specific “Major Event Days”.

SAIFI (times per year) from LADWP 2017-18 Power Infrastructure Plan

DWP chart, 2018

SAIDI (minutes per year) from LADWP 2017-18 Power Infrastructure Plan

DWP chart, 2018

EIA Summary of US Power Service Interruptions

Source: U.S. Energy Information Administration, Annual Electric Power Industry Report (EIA-861 data file) Note durations (SAIDI) are shown in hours, not the IEEE standard of minutes

Summary of 2016 Best & Worst States for Power Service Interruptions

SAIFI: Frequency of Interruptions

SAIDI: Duration of Interruptions

Data Source: U.S. Energy Information Administration, Annual Electric Power Industry Report (EIA-861 data file)

LADWP Reliability Trends: SAIFI, SAIDI, and CAIDI

Data Source: U.S. Energy Information Administration, Annual Electric Power Industry Report (EIA-861 data file); CAIDI calculated SAIDI/SAIFI.

Observations

• Trends: – Restoration times (CAIDI) need improvement versus

California peers; in the middle nationally – Continued, consistent, pro-active PSRP investments

are needed to improve long-term trends – Distribution automation is expected to help

• Areas for improvement – Better communication on pre-warning (a DWP “Flex

Alert”) and on restoration progress – Increased field staffing levels needed, along with

adapting constraints keeping apprentice count low

APPENDIX

EIA 2016 Data on US Utilities over 1 Million Customers` Utility Name Ownership

SAIFI with MED

SAIDI with MED

CAIDI withMED

Number of Customers

Pacific Gas & Electric Co Investor Owned 1.102 121.9 110.6 5,481,869 Southern California Edison Co Investor Owned 1.100 134.5 122.3 5,060,528 Florida Power & Light Co Investor Owned 1.090 412.4 378.3 4,861,990 Commonwealth Edison Co Investor Owned 0.856 97.0 113.3 3,903,478 Oncor Electric Delivery Company LLC Investor Owned 1.720 202.0 117.4 3,377,896 Georgia Power Co Investor Owned 1.630 580.1 355.9 2,420,797 CenterPoint Energy Investor Owned 1.830 225.6 123.3 2,417,035 Public Service Elec & Gas Co Investor Owned 0.850 69.0 81.2 2,311,838 DTE Electric Company Investor Owned 0.986 238.0 241.4 2,187,144 Duke Energy Carolinas, LLC Investor Owned 1.370 338.0 246.7 1,940,614 Consumers Energy Co Investor Owned 1.151 284.0 246.7 1,806,540 Duke Energy Florida, LLC Investor Owned 1.570 362.0 230.6 1,748,864 PECO Energy Co Investor Owned 1.020 114.0 111.8 1,620,919 Niagara Mohawk Power Corp. Investor Owned 1.187 172.1 144.9 1,614,518 Los Angeles Department of Water & Power Municipal 0.820 116.6 142.1 1,596,912 Ohio Power Co Investor Owned 1.292 189.9 147.0 1,461,766 San Diego Gas & Electric Co Investor Owned 0.673 85.5 127.1 1,435,814 PPL Electric Utilities Corp Investor Owned 0.796 95.8 120.4 1,411,897 NSTAR Electric Company Investor Owned 1.080 171.4 158.7 1,395,146 Public Service Co of Colorado Investor Owned 1.230 156.5 127.2 1,355,869 Duke Energy Progress - (NC) Investor Owned 2.570 1790.0 696.5 1,353,328 Baltimore Gas & Electric Co Investor Owned 1.060 119.0 112.3 1,263,263 Connecticut Light & Power Co Investor Owned 1.080 204.2 189.1 1,260,086 Northern States Power Co - Minnesota Investor Owned 1.050 214.3 204.1 1,250,205 Ameren Illinois Company Investor Owned 1.360 239.0 175.7 1,239,428 Union Electric Co - (MO) Investor Owned 1.130 294.0 260.2 1,219,406 Arizona Public Service Co Investor Owned 0.910 119.0 130.8 1,204,345 Puget Sound Energy Inc Investor Owned 1.630 391.0 239.9 1,126,181 Wisconsin Electric Power Co Investor Owned 0.691 95.0 137.5 1,117,621 Jersey Central Power & Lt Co Investor Owned 1.646 228.6 138.9 1,104,469 Entergy Louisiana LLC Investor Owned 1.747 400.4 229.2 1,087,838 Ohio Edison Co Investor Owned 1.006 108.8 108.1 1,036,048 Salt River Project Political Subdivision 0.662 46.4 70.2 1,003,510

Customers total in Utilities Over 1M 64,677,162 Share of US Customers 46%

LADWP percentile rank in utilities over 1 M customers 90% 76% 43% 26%


EIA 2016 Data on California Utilities


Utility Name OwnershipSAIFI

with MED

SAIDI with MED

(m)

CAIDI with MED

(m)Number of Customers

Pacific Gas & Electric Co Investor Owned 1.102 122 111 5,481,869 Southern California Edison Co Investor Owned 1.100 134 122 5,060,528 Los Angeles Department of Water & Power Municipal 0.820 117 142 1,596,912 San Diego Gas & Electric Co Investor Owned 0.673 86 127 1,435,814 Sacramento Municipal Util Dist Political Subdivision 1.560 95 61 618,193 Imperial Irrigation District Political Subdivision 0.790 78 99 150,382 City of Anaheim - (CA) Municipal 0.690 27 39 119,277 Modesto Irrigation District Political Subdivision 0.450 30 67 114,183 City of Riverside - (CA) Municipal 0.990 48 49 108,656 Turlock Irrigation District Political Subdivision 0.540 57 106 85,650 City of Glendale - (CA) Municipal 1.302 44 33 85,313 City of Pasadena - (CA) Municipal 0.180 15 84 63,577 City of Roseville - (CA) Municipal 0.200 12 61 58,349 City of Santa Clara - (CA) Municipal 0.500 36 73 53,300 City of Burbank Water and Power Municipal 0.387 19 50 52,500 Liberty Utilities Investor Owned 1.484 190 128 48,749 PacifiCorp Investor Owned 1.915 219 114 46,519 City of Redding - (CA) Municipal 0.535 50 94 44,029 City of Alameda Municipal 0.310 16 51 33,580 City of Palo Alto - (CA) Municipal 0.350 40 114 29,136 Bear Valley Electric Service Investor Owned 2.508 324 129 23,876 City of Lodi - (CA) Municipal 0.147 14 95 23,842 City of Azusa Municipal 0.397 35 88 16,740 City of Lompoc - (CA) Municipal 0.658 64 97 14,992 Truckee Donner P U D Political Subdivision 1.480 437 295 13,679 Lassen Municipal Utility District Municipal 2.973 164 55 12,052 City of Moreno Valley - (CA) Municipal 0.030 4 124 6,114 City of Healdsburg - (CA) Municipal 0.180 16 87 5,827 Anza Electric Coop Inc Cooperative 12.080 990 82 4,767 City of Shasta Lake - (CA) Municipal 0.370 88 237 4,535 City of Vernon Municipal 0.670 117 175 1,988

Total California Utility Customers 15,414,928

LADWP percentile rank among California utilities 75% 69% 0.13% 21%

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