Company: TVC
Filing Date: 2025-11-13
Form Type: 10-K
Source: 0001376986-25-000056
Chunk: 329

Company: Tennessee Valley Authority
Filing Date: 2025-11-13
Form: 10-K
Item: Item 1
Chunk 329
---
cludes Board of Directors).

(2)  Transmission Performance Indicator is an aggregate measure of the overall reliability of TVA's transmission system.  See Transmission Performance Indicator below. 

(3)  The Nuclear Performance Indicator is the Annualized Online Reliability Loss Factor, which is the 12-month ratio of all generation losses minus refueling outage ("RFO") and exempt losses to reference energy generation minus RFO and exempt losses in a normal fuel cycle period, per standard industry guidelines.  This measure monitors performance between refueling outages to obtain high unit and energy production reliability.

(4)  The Power Operations Performance Indicator is an aggregate measure of the overall reliability of TVA's power operations generation fleet based on key performance measures in Gas, Hydro, and Coal that are intended to ensure that TVA's fleet of power operations generation assets is available and reliable to meet system demand.  See Power Operations Performance Indicator below. 

(5)  The Serious Injury Incident Rate is a mathematical calculation used by Edison Electric Institute that quantifies the extent of injury for serious injuries and fatalities from events within the control of the employee and/or the employer.

Transmission Performance IndicatorWeightThresholdTargetStretchActualLoad Not Served(1)60%4.43.73.13.7Outages per Hundred Miles per Year(2)20%2.862.632.402.76Connection Point Interruption Frequency(3)20%0.670.570.470.57

Notes

(1)  Load Not Served ("LNS") is a measure of the magnitude and duration of transmission system outages that affect TVA customers expressed in system minutes.  TVA manages this critical indicator to reduce the impact of customer outages.  An automatic customer interruption with a duration of one minute or greater is tracked as an LNS event.  LNS events caused by TVA on a distributor system will also count as a TVA event even if the TVA system remains energized.  LNS excludes interruptions due to declared major events, variances, verified tornadoes, gunfire, vandalism, ice formation, and foreign object/vehicle.

(2)  Outages per Hundred Miles per Year ("OHMY") is the number of automatic interruptions (sustained and momentary) to lines greater than or equal to 100-kV per 100 miles of transmission line per year.  OHMY excludes interruptions due to declared major events, variances, verified tornadoes, gunfire, vandalism, ice formation, foreign object/vehicle,