Overview#
A state utility regulator asks an electric provider to submit its annual SAIDI and SAIFI figures, separated into storm and non-storm components, with a note on how they rank against other utilities in the jurisdiction. The Reliability Metrics domain produces exactly those numbers. It reads outage records for the period, applies IEEE 1366 algorithms, detects which days qualify as major event days using the standard threshold multiplier, strips their contribution from the non-storm figure, and then looks up the jurisdiction benchmark table to assign a quartile rank. The same calculation pipeline covers water-specific metrics like loss percentage and pressure complaints, and gas-specific metrics like leak reporting by grade.
Key Features#
- IEEE 1366 index calculation: SAIDI, SAIFI, CAIDI, ASAI, and MAIFI
- Storm versus non-storm SAIDI separation based on outage cause classification
- Major event day detection using daily average threshold multiplier
- Target variance calculation against organisation-configured SAIDI and SAIFI targets
- Jurisdiction-specific benchmark comparison with quartile ranking (top 25%, above median, below median, bottom 25%)
- Support for daily, monthly, quarterly, and annual period types
- Metric persistence with conflict resolution on organisation, utility type, period, and start date
- Water-specific metrics including loss percentage, pressure complaints, and quality violations
- Gas-specific metrics including leak reporting by grade and dig-in incidents
Use Cases#
Reliability index calculation is a core requirement across regulated utility sectors. Relevant industries include electric power distribution, water and wastewater utilities, and natural gas networks.
- Calculating monthly and annual reliability indices for regulatory reporting and benchmarking
- Comparing utility performance against jurisdiction-specific benchmarks for quartile ranking
- Separating storm impact from baseline reliability to identify operational improvement areas
- Tracking performance variance against organisational targets for continuous improvement
Integration#
The Reliability Metrics domain reads from organisation configuration for customer counts and targets, jurisdiction registries for benchmarks, and outage records for period calculations. All operations are organisation-scoped.
Open Standards#
- IEEE 1366 (Guide for Electric Power Distribution Reliability Indices): The core calculation engine implements the IEEE 1366 formulas for SAIDI, SAIFI, CAIDI, ASAI, and MAIFI, and applies the IEEE 1366 2.5 Beta method to identify Major Event Days and separate storm from non-storm indices.
- ISO 3166-1 / ISO 3166-2: Jurisdiction codes follow ISO 3166-1 alpha-2 (country) and ISO 3166-2 subdivision notation (e.g. US-CA, GB-ENG) to select the correct regulatory framework, metric labels, and benchmark dataset for each calculation.
- EIA Form 861 (Annual Electric Power Industry Report): National benchmark quartiles for SAIDI and SAIFI are sourced from the US Energy Information Administration's Form 861 dataset, and are used as the fallback when no jurisdiction-specific benchmark is registered.
- PHMSA 49 CFR Part 192 (Pipeline Safety Regulations): Gas-network reliability records classify reported leaks by grade (Grade 1, 2, and 3) in direct alignment with the US Department of Transportation / PHMSA hazard-grading scheme for natural gas distribution pipelines.
- GraphQL (June 2018 specification): All reliability metrics queries and calculation mutations are exposed through a strongly-typed GraphQL API, allowing clients to request precisely the indices, period types, and benchmark comparisons they require.
- EN 50160 (Voltage Characteristics of Electricity Supplied by Public Networks): The jurisdiction registry recognises EN 50160 as the applicable compliance framework for electric utilities in GB and EU jurisdictions, enabling benchmark selection and reporting aligned to that standard.
- NIS2 Directive (EU 2022/2555): The jurisdiction registry maps NIS2 as a cross-sector compliance obligation for electric, water, gas, and telecom utilities across EU, GB, IE, DE, FR, and ES jurisdictions, surfacing it alongside the reliability indices for regulatory reporting.
Last Reviewed: 2026-02-24 Last Updated: 2026-04-14