Facts & Figures 

REPORT TOOLS

 

 2016 Annual Report Glossary

 

Customer Average Interruption Duration Index (CAIDI)

A measure (in hours) of the average duration of interruptions experienced by customers, not including Major Event Days (MED). CAIDI represents the quotient obtained by dividing the System Average Interruption Duration Index (SAIDI) by the System Average Interruption Frequency Index (SAIFI).

 

Gigawatt-Hour (GWh)

A standard unit for measuring electrical energy produced or consumed over time. One GWh is equal to one million kilowatt-hours.

 

Kilowatt (kW)

A common measure of electrical power equal to 1,000 watts.

 

Kilowatt-Hour (kWh)

A standard unit for measuring electrical energy produced or consumed over time. One kWh is the amount of electricity consumed by ten 100-watt light bulbs burning for one hour.

 

Major Event Days (MED)

Refers to major event days as defined by IEEE Standard 1366-2012, IEEE Guide for Electric Power Distribution Reliability Indices.

 

Megawatt (MW)

A common measure of electrical power equal to one million watts.

 

Peak Load

The maximum demand for power, measured in megawatts that occurs within a stated period of time. Toronto Hydro's peak system load (or peak demand) normally occurs in the summer because of power demands from air conditioning.

 

System Average Interruption Duration Index (SAIDI)

A measure (in hours) of the annual system average interruption duration for customers served, not including MED. SAIDI represents the quotient obtained by dividing the total customer hours of interruptions longer than one minute by the number of customers served.

 

System Average Interruption Frequency Index (SAIFI)

A measure of the frequency of service interruptions for customers served, not including MED. SAIFI represents the quotient obtained by dividing the total number of customer interruptions longer than one minute by the number of customers served.

 

Watt

A common measure of electrical power. One watt equals the power used when one ampere of current flows through an electrical circuit with a potential of one volt.

 

Watt-Hour

A measure of energy production or consumption equal to one watt produced or consumed for one hour.

 

 

More about Toronto Hydro Corporation:


Terms & Conditions | Privacy Policy

A registered trademark of Toronto Hydro Corporation.