As of the end of FY2024
| Voltage (kV) |
Overhead | Underground | |||
|---|---|---|---|---|---|
| Route Length (km) | Circuit Length (km) | Number of supports (units) | Route Length (km) | Circuit Length (km) | |
| 500 | 2,542 | 4,696 | 5,478 | 40 | 79 |
| 275 | 1,171 | 2,323 | 3,150 | 412 | 1,163 |
| 154 | 2,898 | 5,910 | 9,757 | 320 | 799 |
| 66 | 7,746 | 15,015 | 24,756 | 3,753 | 7,071 |
| Below 55 | 468 | 509 | 6,515 | 2,027 | 3,580 |
| Total | 14,825 | 28,453 | 49,656 | 6,551 | 12,692 |
(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.
