As of the end of FY2022
| Voltage (kV) |
Overhead | Underground | |||
|---|---|---|---|---|---|
| Route Length (km) | Circuit Length (km) | Number of supports (units) | Route Length (km) | Circuit Length (km) | |
| 500 | 2,542 | 4,698 | 5,286 | 40 | 79 |
| 275 | 1,164 | 2,310 | 3,132 | 404 | 1,152 |
| 154 | 2,932 | 5,957 | 9,998 | 311 | 781 |
| 66 | 7,727 | 14,998 | 24,787 | 3,706 | 6,972 |
| Below 55 | 476 | 517 | 6,799 | 2,044 | 3,573 |
| Total | 14,841 | 28,480 | 50,002 | 6,505 | 12,557 |
(Notes)
- Route length refers to the total length between two points on a line (horizontal length between supports). Circuit length refers to the sum of the route length of each circuit on a line.
- Due to the Accounting Rules for Electricity Business amendment (effective from March 29, 2000), distribution facilities with voltage over 20 kV have been included in transmission facilities since FY1999.
- The sum is not equal to a total of breaskdown due to rounding.
