GAA Performance Indexes records store information about the fields that are defined for the GAA Performance Indexes family in the baseline GE Digital APM database. This topic provides an alphabetical list and description of the fields that exist for the GAA Performance Indexes family and appear on the datasheet. The information in the table reflects the baseline state and behavior of these fields. The values in these fields are defined by NERC in the GADS DRI and CEA in the Generation Equipment Status ERIS. This list is not comprehensive.
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Note: Wherever we refer to the unit, we mean the unit represented by the GAA Unit record to which the Performance record is linked.
| Field | Data Type | Description | Behavior and Usage |
|---|---|---|---|
| Capacity Factor | Numeric |
Indicates the energy that was produced by a Generating Unit in a given period as a fraction of the Maximum Generation. Maximum Generation is the period hours (PH) times the Maximum Capacity. |
This field is disabled and populated automatically using the following formula: [Actual Generation / (Period Hours X Maximum Capacity)] X 100% Note: Capacity Factor calculated using this equation can be negative during a period when the unit is shut down. |
| D1 Equivalent Unplanned Derate MWH | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit cannot reach its full capacity due to Unplanned Derating (D1). |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Equivalent Unplanned Derated hours (D1) |
| D2 Equivalent Unplanned Derate MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit cannot reach its full capacity due to Unplanned Derating (D2). |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Equivalent Unplanned Derated hours (D2) |
| D3 Equivalent Unplanned Derate MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit cannot reach its full capacity due to Unplanned Derating (D3). |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Equivalent Unplanned Derated hours (D3) |
| D4 Equivalent Maintenance Derate MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit cannot reach its full capacity due to Unplanned Derating (D4). |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Equivalent Unplanned Derated hours (D4) |
| Equivalent Availability Factor | Numeric | Indicates the fraction of Maximum Generation that could be provided if limited only by outages and deratings. |
This field is disabled and populated automatically using the following formula: [(Available Hours - Equivalent Planned Derated Hours – Equivalent Unplanned Derated Hours - Equivalent Seasonal Derated Hours) / Period Hours] X 100% |
| Equivalent Forced Derated Hours During Reserve Shutdown | Numeric | Indicates the number of hours the unit will be inactive when the unit cannot reach its full capacity due to Forced Derating (D1, D2, D3) or portion of any Forced derating which occurred during a Reserve Shutdown (RS). Each individual Forced Derating or the portion of any Forced derating which occurred during a Reserve Shutdown is transformed into equivalent full outage hour(s). |
This field is disabled and populated automatically using the following formula: (Derating Hours x Size of Reduction) / NMC Where, Derating Hours are the sum of individual Forced Derating hours (D1, D2, D3) or the portion of any Forced derating hours which occurred during a Reserve Shutdown (RS). Size of Reduction is calculated by subtracting the Net Available Capacity (NAC) from the Net Dependable Capacity (NDC). For multiple deratings, the Size of Reduction of each derating will be calculated by the difference in the Net Available Capacity of the unit before the derating and the reported Net Available Capacity after the derating. This value is defined by NERC in the GADS DRI. |
| Equivalent Forced Outage Factor | Numeric | Indicates the fraction of a given operating period in which a Generating Unit is not available due to forced outages and forced deratings. |
This field is disabled and populated automatically using the following formula: [(Forced Outage Hours + Equivalent Forced Derated Hours) / Period Hours] X 100 % |
| Equivalent Forced Outage Rate | Numeric | A measure of the probability that a GAA Unit will not be available due to forced outages or forced deratings. |
This field is disabled and populated automatically using the following formula: [(Forced Outage Hours + Equivalent Forced Derated Hours) / (Forced Outage Hours + Service Hours + Synchronous Hours + Pumping Hours + Equivalent Forced Derated Hours During Reserve Shutdown)] X 100 % |
| Equivalent Forced Outage Rate Demand | Numeric | Indicates the portion of time a unit is in demand, but is unavailable due to a forced outage. |
This field is disabled and populated automatically using the following formula: [(Forced Outage Hours Demand + Equivalent Forced Derated Hours Demand) / (Service Hours + Forced Outage Hours Demand)] X 100 % |
| Equivalent Maintenance Derated Hours | Numeric | Indicates the number of hours the unit will be inactive when the unit cannot reach its full capacity due to Maintenance Derating (D4, DM). Each individual Maintenance Derating is transformed into equivalent full outage hour(s). |
This field is disabled and populated automatically using the following formula: (Derating Hours x Size of Reduction) / NMC Where, Derating Hours are the sum of individual Maintenance Derating hours (D4, DM). Size of Reduction is calculated by subtracting the Net Available Capacity (NAC) from the Net Dependable Capacity (NDC). For multiple deratings, the Size of Reduction of each derating will be calculated by the difference in the Net Available Capacity of the unit before the derating and the reported Net Available Capacity after the derating. This value is defined by NERC in the GADS DRI. |
| Equivalent Maintenance Derated Hours During Reserve Shutdown | Numeric | Indicates the number of hours the unit will be inactive when the unit cannot reach its full capacity due to Maintenance Derating (D4) or the portion of any Maintenance derating which occurred during a Reserve Shutdown (RS). Each individual Maintenance Derating (D4) or the portion of any Maintenance derating which occurred during a Reserve Shutdown is transformed into equivalent full outage hour(s). |
This field is disabled and populated automatically using the following formula: (Derating Hours x Size of Reduction) / NMC Where, Derating Hours are the sum of individual Maintenance Derating hours (D4) or the portion of any Maintenance derating hours which occurred during a Reserve Shutdown (RS). Size of Reduction is calculated by subtracting the Net Available Capacity (NAC) from the Net Dependable Capacity (NDC). For multiple deratings, the Size of Reduction of each derating will be calculated by the difference in the Net Available Capacity of the unit before the derating and the reported Net Available Capacity after the derating. This value is defined by NERC in the GADS DRI. |
| Equivalent Maintenance Outage Factor | Numeric | Indicates the fraction of a given operating period in which a Generating Unit is not available due to maintenance outages and maintenance deratings |
This field is disabled and populated automatically using the following formula: [(Maintenance Outage Hours + Equivalent Maintenance Derated Hours) / Period Hours] X 100 % |
| Equivalent Maintenance Outage Rate | Numeric | A measure of the probability that a GAA Unit will not be available due to maintenance outages or maintenance deratings. |
This field is disabled and populated automatically using the following formula: [(Maintenance Outage Hours + Equivalent Maintenance Derated Hours) / ∑ (Maintenance Outage Hours + Service Hours + Synchronous Hours + Pumping Hours + Equivalent Maintenance Derated Hours During Reserve Shutdowns)] X 100% |
| Equivalent Planned Derated Hours | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit cannot reach its full capacity due to Planned Deratings (PD, DP). Each individual Planned Derating is transformed into equivalent full outage hour(s). |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Equipment Planned Derate hours This value is defined by NERC in the GADS DRI. |
| Equivalent Planned Derated Hours During Reserve Shutdown | Numeric | Indicates the number of hours the unit will be inactive when the unit cannot reach its full capacity due to Planned Derating (PD) or the portion of any Planned derating which occurred during a Reserve Shutdown (RS). Each individual Planned Derating or the portion of any Planned derating which occurred during a Reserve Shutdown is transformed into equivalent full outage hour(s). |
This field is disabled and populated automatically using the following formula: (Derating Hours x Size of Reduction) / NMC Where, Derating Hours are the sum of individual Planned Derating (PD) or the portion of any Planned derating which occurred during a Reserve Shutdown (RS). Size of Reduction is calculated by subtracting the Net Available Capacity (NAC) from the Net Dependable Capacity (NDC). For multiple deratings, the Size of Reduction of each derating will be calculated by the difference in the Net Available Capacity of the unit before the derating and the reported Net Available Capacity after the derating. This value is defined by NERC in the GADS DRI. |
| Equivalent Planned Derate MWH | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit cannot reach its full capacity due to Planned Deratings (PD, DP). Each individual Planned Derating is transformed into equivalent full outage hour(s). |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Equipment Planned Derate hours |
| Equivalent Planned Outage Factor | Numeric | Indicates the fraction of a given operating period in which a generating unit is not available due to planned outages and planned deratings. |
This field is disabled and populated automatically using the following formula: [(Planned Outage Hours + Equivalent Planned Derated Hours) / Period Hours] X 100 % |
| Equivalent Planned Outage Rate | Numeric | A measure of the probability that a GAA Unit will not be available due to planned outages or planned deratings. |
This field is disabled and populated automatically using the following formula: [(Planned Outage Hours + Equivalent Planned Derated Hours) / (Planned Outage Hours + Service Hours + Synchronous Hours + Pumping Hours + Equivalent Planned Derated Hours During Reserve Shutdowns)] X 100% |
| Equivalent Scheduled Derated Hours | Numeric | Indicates the number of hours the unit will be inactive when the unit cannot reach its full capacity due to Planned Derating (PD, DP) and Maintenance Derating (D4, DM). Each individual Planned Derating and Maintenance Derating is transformed into equivalent full outage hour(s). |
This field is disabled and populated automatically using the following formula: (Derating Hours x Size of Reduction) / NMC Where, Derating Hours are the sum of individual Planned Derating hours (PD, DP) and Maintenance Derating hours (D4, DM). Size of Reduction is calculated by subtracting the Net Available Capacity (NAC) from the Net Dependable Capacity (NDC). For multiple deratings, the Size of Reduction of each derating will be calculated by the difference in the Net Available Capacity of the unit before the derating and the reported Net Available Capacity after the derating. This value is defined by NERC in the GADS DRI. |
| Equivalent Scheduled Outage Factor | Numeric | Indicates the fraction of a given operating period in which a Generating Unit is not available due to scheduled outages and scheduled deratings |
This field is disabled and populated automatically using one of the following formula: [(Scheduled Outage Hours + Equivalent Scheduled Derated Hours) / Period Hours] X 100 % |
| Equivalent Seasonal Derated Hours | Numeric | Indicates the number of hours the unit will be inactive when the unit cannot reach its full capacity due to seasonal outages. |
This field is disabled and populated automatically using the following formula: (Net Maximum Capacity (NMC) - Net Dependable Capacity (NDC) x Available Hours (AH)) / Net Maximum Capacity (NMC). ((NMC - NDC) x AH) / NMC This value is defined by NERC in the GADS DRI. |
| Equivalent Unplanned Derated Hours | Numeric | Indicates the number of hours the unit will be inactive when the unit cannot reach its full capacity due to Unplanned Deratings (D1, D2, D3, D4, DM). Each individual Unplanned Derating is transformed into equivalent full outage hour(s). |
This field is disabled and populated automatically using the following formula: (Derating Hours x Size of Reduction) / NMC Where, Derating Hours are the sum of individual Unplanned Derating hours (D1, D2, D3, D4, DM) and Unplanned Deratings (D1, D2, D3, D4, DM) during Reserve Shutdowns (RS). Size of Reduction is calculated by subtracting the Net Available Capacity (NAC) from the Net Dependable Capacity (NDC). For multiple deratings, the Size of Reduction of each derating will be calculated by the difference in the Net Available Capacity of the unit before the derating and the reported Net Available Capacity after the derating. |
| Equivalent Unavailability Factor | Numeric | Indicates the fraction of Maximum Generation that could not be produced due to unit deratings and planned and unplanned outages. |
This field is disabled and populated automatically using the following formula: [(Unplanned Outage Hours + Planned Outage Hours + Equivalent Unplanned Derated Hours + Equivalent Planned Derated Hours) / Period Hours] X 100% |
| Equivalent Unplanned Outage Factor | Numeric | Indicates the fraction of a given operating period in which a generating unit is not available due to forced and maintenance outages and forced and maintenance deratings. |
This field is disabled and populated automatically using one of the following formula: [(Unplanned Outage Hours + Equivalent Unplanned Derated Hours) / Period Hours] X 100% Note: The Equivalent Unplanned Outage Factor is identical to the Unit Capability Loss Factor except this equation includes all events, including those outside plant management control. |
| Equivalent Unplanned Outage Rate | Numeric | A measure of the probability that a GAA Unit will not be available due to unplanned outages or unplanned deratings. |
This field is disabled and populated automatically using the following formula: [(Unplanned Outage Hours + Equivalent Unplanned Derated Hours) / Unplanned Outage Hours + Service Hours + Synchronous Hours + Pumping Hours + Equivalent Unplanned Derated Hours During Reserve Shutdowns)] X 100% |
| Extended Maintenance Derate Equivalent MWH | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit cannot reach its full capacity due to extension of a Maintenance Derating beyond its estimated completion date. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Extended Maintenance Equivalent hours |
| Extended Planned Derate Equivalent MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit cannot reach its full capacity due to extension of a Planned Derating beyond its estimated completion date. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Extended Planned Derate Equivalent hours |
| Forced Outage MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to immediate, delayed, and postponed outages and startup failure outages. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Forced Outage hours |
| Maintenance and Extension Outage MWH | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to Maintenance Outages (MO) and Maintenance Outage Extensions (ME) of any Maintenance Outages (MO). This also includes the extension of a Maintenance Outage beyond its estimated completion date. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Maintenance and Extended Outage hours |
| Maintenance Outage MWH | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to maintenance outages. This includes all the hours experienced during Maintenance Outages (MO). |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Maintenance Outage hours |
| Maintenance Outage Scheduled Extension MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit was scheduled to be inactive due to extension of a Maintenance Outage beyond its estimated completion date. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Maintenance Outage Scheduled Extension hours |
| Non Curtailing Event MWH | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to removal of an equipment or a major component from service for maintenance, testing, or other purposes that did not result in a unit outage or derating. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Number of Non Curtailing Events |
| Output Factor | Numeric | Indicates the Capacity Factor when the period is applicable only to the in service state. |
This field is disabled and populated automatically using the following formula: [Actual Generation / (Service Hours X Maximum Capacity)] X 100 % If you selected Net Maximum Capacity (NMC) in the weightage type in the GAA Unit record, the value in this field will based on the net values. If you selected Gross Maximum Capacity (GMC) in the weightage type in the GAA Unit record, the value in this field will based on the gross values. |
|
Planned and Extension Outage MWH |
Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to Planned Outages (PO) and Planned Outage Extensions (PE) of any Planned Outages (PO). This also includes the extension of a Planned Outage beyond its estimated completion date. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Planned and Extension Outage hours |
| Planned Outage MWH | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to planned outages. This includes all the hours experienced during Planned Outages (PO). |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Planned Outage hours |
|
Planned Outage Scheduled Extension MWH |
Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to extension of a Planned Outage beyond its estimated completion date. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Planned Outage Scheduled Extension hours |
| Reserve Shutdown MWH | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit was available, but was not in service. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Reserve Shutdown hours |
| Seasonal Derating Factor | Numeric | Indicates the fraction of Maximum Generation that could not be produced due to seasonal deratings. |
This field is disabled and populated automatically using the following formula: (Equivalent Seasonal Derated Hours / Period Hours) X 100% |
| Startup Failure MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit was unable to start within a specified startup time. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Startup Failure hours |
| Total Equivalent Derate MWH | Numeric |
Indicates the amount of capacity lost (in Mega Watt hours) when the unit will be inactive when the unit cannot reach its full capacity due to any of the derates. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x Total Equivalent Derate hours |
| U1 Unplanned Outage MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to U1 unplanned outages. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x U1 Unplanned Outage hours |
| U2 Unplanned Outage MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to U2 unplanned outages. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x U2 Unplanned Outage hours |
| U3 Unplanned Outage MWH | Numeric | Indicates the amount of capacity lost (in Mega Watt hours) when the unit was inactive due to U3 unplanned outages. |
This field is disabled and populated automatically using the following formula: Net Maximum Capacity x U3 Unplanned Outage hours |
| Unit Derating Factor | Numeric | Indicates the fraction of Maximum Generation that could not be produced due to unit deratings. |
This field is disabled and populated automatically using the following formula: [(Equivalent Planned Derated Hours + Equivalent Unplanned Derated Hours) / Period Hours] X 100% |
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