As of the end of FY2023
| 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 | 5,478 | 40 | 79 |
| 275 | 1,176 | 2,333 | 3,165 | 404 | 1,152 |
| 154 | 2,897 | 5,904 | 9,814 | 312 | 782 |
| 66 | 7,719 | 14,961 | 24,724 | 3,722 | 6,999 |
| Below 55 | 474 | 515 | 6,641 | 2,035 | 3,578 |
| Total | 14,807 | 28,410 | 49,822 | 6,512 | 12,589 |
(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.
