i is each generating unit FOH (or outage hours’) is the total number of hours that a generating ‘forced unit is unavailable due to forced outages. EFOH (or forced outage hours’) is the equivalent partial outage ‘equivalent hours due to partial forced outages. H is the total number of hours. However, if a generating unit is commissioned during the reporting period, H will be the total number of hours from the date the generating unit is commissioned up until the end of the reporting period. GMC is the gross maximum capacity (applicable to weighted multiple generating units that are part of the same power station). EFOF is expressed as a percentage. [Example: Assuming a power station has two generating units, A and B, with a gross maximum capacity of 10 MW and 20 MW respectively During the reporting – period generating unit A was forced out of service for 8 days and was also restricted to 50% of its total generation output for 80 hours because of a partial forced outage. Generating Unit B was restricted to 30% of its total generation output for 48 hours. The power station’s EFOF would be calculated as EFOF = (((192 + (80 X 0.5)) X 10) + ((48 X 0.3) X 20)) / ((8760 X 10) + (8760 X 20)) X 100 EFOF = 0.99%] Generation services reliability performance indicators When calculating generation services reliability performance indicators: for each power system: only include those generation interruptions that are caused by generation events that are related to generating units/facilities that form part of the same power system and affect supply to customers located within the same power system; and only include those customers who are supplied by the same power system; and for each region: only include those generation interruptions caused by generation events related to generating units/facilities that form part of the same power system and affect supply to customers located within the boundaries of the same region; and only include those customers who receive supply from within the boundaries of the same region.
i is each generating unit FOH (or ‘forced outage hours’) is the total number of hours that a generating unit is unavailable due to forced outages. EFOH (or ‘equivalent forced outage hours’) is the equivalent partial outage hours due to partial forced outages. H is the total number of hours. However, if a generating unit is commissioned during the reporting period, H will be the total number of hours from the date the generating unit is commissioned up until the end of the reporting period. GMC is the gross maximum capacity (applicable to weighted multiple generating units that are part of the same power station). EFOF is expressed as a percentage. [Example: Assuming a power station has two generating units, A and B, with a gross maximum capacity of 10 MW and 20 MW respectively – During the reporting period generating unit A was forced out of service for 8 days and was also restricted to 50% of its total generation output for 80 hours because of a partial forced outage. Generating Unit B was restricted to 30% of its total generation output for 48 hours. The power station’s EFOF would be calculated as EFOF = (((192 + (80 X 0.5)) X 10) + ((48 X 0.3) X 20)) / ((8760 X 10) + (8760 X 20)) X 100 EFOF = 0.99%] Generation services reliability performance indicators When calculating generation services reliability performance indicators: for each power system: only include those generation interruptions that are caused by generation events that are related to generating units/facilities that form part of the same power system and affect supply to customers located within the same power system; and only include those customers who are supplied by the same power system; and for each region: only include those generation interruptions caused by generation events related to generating units/facilities that form part of the same power system and affect supply to customers located within the boundaries of the same region; and only include those customers who receive supply from within the boundaries of the same region.