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Electric Reliability

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HG&E understands that electricity is vital to the way we do business and live our lives.  HG&E is therefore proud to offer its customers highly reliable electric service, ensuring that power is available to you as often as possible.  As a mark of its dedication to its innovation and its commitment to exemplary service, HG&E is a recipient of the prestigious RP3 Diamond designation from the American Public Power Association, which is held by less than 2% of the country’s over 2,000 municipally owned utility companies.  Such status is awarded to municipal utility companies that provide customers with the highest degree of reliable and safe electric service.

In order to ensure that electric service remains reliable, HG&E continuously monitors its reliability indices, which give HG&E a sense of its performance compared to other utilities and allow HG&E to identify and target potential problem areas on its system.  This procedure allows HG&E to plan reliability-related projects on its system.  

Some of the reliability indices commonly used to define the length and frequency of interruptions to customers, system availability, and the number of customers affected by outages in the utility industry are CAIDI, SAIDI, and SAIFI.  They are defined as follows:

Customer Average Interruption Duration Index (CAIDI) – represents the average time expected to take to restore service after a sustained interruption.

System Average Interruption Duration Index (SAIDI) – defines the average interruption duration per customer served.

System Average Interruption Frequency Index (SAIFI) – defines the average number of times that a customer’s service is interrupted during a given year.

The table below shows HG&E’s reliability statistics for years 2017, 2016 and 2015, as well as typical municipal and private utility reliability statistics.

Reliability Statistic

HG&E 2017

HG&E 2016

HG&E 2015

Typical Municipal Utility*

Typical Private Utility**


56.07 minutes

76.91 minutes

47.68 minutes

96 minutes

107.3 minutes


21.67 minutes

43.31 minutes

35.05 minutes

58 minutes

211.57 minutes


0.39 outages

0.56 outages

0.74 outages

1.11 outage

1.65 outages

*American Public Power Association (APPA)
**Energy Council of the Northeast (ECNE) Reliability Committee

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