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Annual Reliability Reports of Electric Companies

Regulated electric utilities must file reliability reports at least once a year. The report must identify the total number of customer complaints about reliability and power quality made to the utility during the year, and must distinguish between complaints about sustained interruptions and power quality. The report must also identify complaints that were made about major events.

Washington's three investor-owned electric companies use two main metrics, SAIDI and SAIFI, to describe the reliability of the service they provide. SAIDI, the System Average Interruption Duration Index, describes the average length of an outage in minutes. SAIFI, the System Average Interruption Frequency Index, describes the average number of outages a customer experiences.

The following data comes from annual reports filed by each regulated utility. 

SAIDI IEEE

 

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012 ​

 2013

 2014

 2015

2016

2017

2018

Avista

81

112

126

108

143

132

162

193

146

118

138

 138

 139

 163

 133

 183

126

Pacific Power

86

 91

  87

110

121

122

131

162

107

80

100

 113

122

 100

 103

 124

126

PSE

99

106

115

124

163

143

155

145

124

144

120

 125

154

 163

 154

 175

145

SAIFI IEEE

 

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012

 2013

 2014

 2015

 2016

 2017

2018

Avista

1.01

0.92

1.01

0.97

1.29

1.14

1.40

1.52

1.23

1.08

1.14​

 1.05

1.11

 1.05

 0.86

 1.20

0.99

Pacific Power

0.69

0.93

0.71

0.81

0.98

1.11

1.33

1.04

0.86

0.86

0.66​

 0.79

.79

 .85

 1.16

 0.88

0.81

PSE

0.80

0.71

0.77

0.93

1.05

0.91

0.98

0.94

0.87

1.23

0.83

 0.86

1.0

 1.04

 1.02

 1.12

0.99

Staff Inquiry into Reliability Reporting

In 2015, the Commission opened an investigation under Docket U-151958 to investigate the validity of an econometric approach to benchmarking reliability performance. During the course of this review, electric utilities continued to submit annual reliability reports pursuant to WAC 480-100-398. After reviewing the 2017 reliability reports, Staff identified significant inconsistencies in the types of information utilities were reporting as well as categories of information included in the reports that were largely unrelated to reliability. Staff initiated a broader review of reliability reporting with the goal of assessing the need for improving the usefulness of content of the reports and eliminating certain content unrelated to reliability. A team comprised of the Commission's regulatory services, policy, and consumer protection sections were assembled to undertake this assessment. The team's objectives were to:

  • Gain a better understanding of the context in which the content of the reliability reports originated and continues to evolve;
  • Discuss possible content improvements to the annual reliability reports in an effort to provide stakeholders with useful reliability information; and,
  • Develop a briefing on staff's findings and recommendations.

Due to the fact that reliability performance benchmarks are typically provided in annual reliability reports, the broader reliability reporting inquiry included an additional layer of review of reliability benchmarking methods and the value of those benchmarks. Therefore, Staff's recommendations with regard to econometric benchmarking, and reliability benchmarking more generally, were informed by both the efforts in Docket U-151958 and the reliability reporting inquiry. The results of that inquiry, as well as Staff's investigation in Docket U-151958, were presented to the Commission at the regularly scheduled open meeting on January 10, 2019.

Reliability Reporting Inquiry

Based on its recommendations at the open meeting, the Commission issued a notice requesting written comments on the Commission Staff's Electric Service Reliability Reporting Inquiry. In addition, the Commission scheduled a workshop for March 21 to investigate the Staff recommendations.

Notice

For the current report click on the total in the last column.

National Regulatory Research Institute (NRRI) Reports

Background studies that examined electric system reliability 

UTC Study on System Cost Data submitted by Regulated Industries

Department of Commerce Study on System Reliability