| Table 8.12.A. U.S. Transmission Circuit Sustained Automatic Outage Counts and Hours |
| by High-Voltage Size and NERC Region, 2022 |
| Sustained Automatic Outage Counts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Voltage | Region | |||||||||
| Type | Operating (kV) | frcc | mro | npcc | rfc | serc | spp | tre | wecc | Contiguous U.S. |
| Grand Total | . | . | . | . | . | . | . | . | -- | |
| Total Outages per 1,000 Circuit Miles | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Region | ||||||||||
| frcc | mro | npcc | rfc | serc | spp | tre | wecc | Contiguous U.S. | ||
| Rate | . | . | . | . | . | . | . | . | -- | |
| Sustained Automatic Outage Hours | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Voltage | Region | |||||||||
| Type | Operating (kV) | frcc | mro | npcc | rfc | serc | spp | tre | wecc | Contiguous U.S. |
| Grand Total | . | . | . | . | . | . | . | . | -- | |
| Outage Hours per Outage Incident | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Region | ||||||||||
| frcc | mro | npcc | rfc | serc | spp | tre | wecc | Contiguous U.S. | ||
| Rate | . | . | . | . | . | . | . | . | -- | |
| Notes: * = Value is less than half of the smallest unit of measure. (e.g., for values with no decimals, the smallest unit is 1 then values under 0.5 are shown as *.) Circuit Miles for each region is displayed in Table 8.10.A. An Automatic Outage is an outage which results from the automatic operation of a switching device, causing an Element to change from an In-Service State to a not In-Service State. A Sustained Outage is an automatic outage with an outage duration of a minute or greater. Source: U.S. Energy Information Administration, Form EIA-411, "Coordinated Bulk Power Supply Program Report." |