As of the end of FY2023
| At the end of FY | TEPCO total | Within Tokyo's 23 Wards | Within Central Tokyo(*2) (Chuo-, Chiyoda-, and part of Minato-ward) |
Total of 10 Electric Power Co.(*5) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overhead lines (km) | Under ground lines (km) |
Underground installation rate (%) | Overhead lines (km) | Under ground lines (km) |
Underground installation rate (%) | Overhead lines (km) | Under ground lines (km) |
Underground installation rate (%) | Overhead lines (km) | Under ground lines (km) |
Underground installation rate (%) | |
| 1965 | 128,253 | 3,941 | 3 | 14,676 | 2,952 | 16.7 | － | － | － | 592,862 | 5,793 | 1 |
| 1970 | 165,009 | 6,141 | 3.6 | 17,208 | 3,899 | 18.5 | － | － | － | 725,459 | 9,416 | 1.3 |
| 1975 | 198,734 | 7,934 | 3.8 | 18,453 | 4,701 | 20.3 | － | － | － | 832,127 | 14,358 | 1.7 |
| 1980 | 231,393 | 10,701 | 4.4 | 18,561 | 6,015 | 24.5 | 549 | 1,961 | 78.1 | 919,340 | 19,841 | 2.1 |
| 1985 | 253,444 | 13,237 | 5 | 18,915 | 7,160 | 27.5 | 573 | 2,109 | 78.6 | 987,182 | 25,208 | 2.5 |
| 1990 | 278,794 | 19,902 | 6.7 | 19,025 | 10,368 | 35.3 | 847 | 3,249 | 79.3 | 1,071,994 | 38,374 | 3.5 |
| 1995 | 298,436 | 25,850 | 8 | 19,170 | 13,013 | 40.4 | 763 | 3,865 | 83.5 | 1,144,958 | 50,764 | 4.2 |
| 1998 | 308,563 | 28,600 | 8.5 | 19,221 | 13,943 | 42 | 724 | 3,996 | 84.7 | 1,183,776 | 57,376 | 4.6 |
| 1999 | 311,419 | 29,492 | 8.7 | 19,226 | 14,216 | 42.5 | 717 | 4,034 | 84.9 | 1,194,784 | 59,359 | 4.7 |
| 2000 | 314,077 | 30,294 | 8.8 | 19,210 | 14,487 | 43 | 706 | 4,068 | 85.2 | 1,204,118 | 61,077 | 4.8 |
| 2001 | 316,385 | 31,070 | 8.9 | 19,197 | 14,680 | 43.3 | 699 | 4,102 | 85.4 | 1,212,142 | 62,522 | 4.9 |
| 2002 | 318,322 | 31,609 | 9 | 19,190 | 14,687 | 43.4 | 694 | 4,085 | 85.5 | 1,282,821 | 63,949 | 5 |
| 2003 | 320,145 | 32,299 | 9.2 | 19,188 | 14,961 | 43.8 | 686 | 4,058 | 85.5 | 1,225,077 | 65,423 | 5.1 |
| 2004 | 321,935 | 32,830 | 9.3 | 19,187 | 15,113 | 44.1 | 680 | 4,110 | 85.8 | 1,231,180 | 66,704 | 5.1 |
| 2005 | 324,062 | 33,418 | 9.3 | 19,174 | 15,305 | 44.4 | 664 | 4,166 | 86.3 | 1,247,655 | 68,088 | 5.2 |
| 2006 | 326,123 | 34,028 | 9.4 | 19,167 | 15,498 | 44.7 | 658 | 4,207 | 86.5 | 1,254,011 | 69,338 | 5.2 |
| 2007 | 327,928 | 34,567 | 9.5 | 19,160 | 15,703 | 45 | 654 | 4,254 | 86.7 | 1,260,137 | 70,627 | 5.3 |
| 2008 | 329,581 | 35,061 | 9.6 | 19,142 | 15,840 | 45.3 | 651 | 4,260 | 86.7 | 1,265,471 | 71,943 | 5.4 |
| 2009 | 330,917 | 35,487 | 9.7 | 19,128 | 16,004 | 45.6 | 643 | 4,278 | 86.9 | 1,270,352 | 73,104 | 5.4 |
| 2010 | 332,120 | 35,887 | 9.8 | 19,097 | 16,147 | 45.8 | 637 | 4,302 | 87.1 | 1,267,640 | 74,118 | 5.5 |
| 2011 | 333,162 | 36,315 | 9.8 | 19,059 | 16,263 | 46 | 630 | 4,322 | 87.3 | 1,268,126 | 75,941 | 5.6 |
| 2012 | 334,071 | 36,697 | 9.9 | 19,031 | 16,387 | 46.3 | 620 | 4,345 | 87.5 | 1,271,856 | 75,851 | 5.6 |
| 2013 | 335,207 | 37,091 | 10 | 18,986 | 16,529 | 46.5 | 616 | 4,365 | 87.6 | 1,276,520 | 76,767 | 5.7 |
| 2014 | 336,505 | 37,384 | 10 | 18,959 | 16,625 | 46.7 | 610 | 4,391 | 87.8 | 1,280,851 | 77,537 | 5.7 |
| 2015 | 337,906 | 37,686 | 10 | 18,907 | 16,741 | 47 | 604 | 4,412 | 88 | 1,285,486 | 78,310 | 5.7 |
| 2016 | 339,108 | 37,945 | 10.1 | 18,860 | 16,800 | 47.1 | 596 | 4,402 | 88.1 | 1,289,752 | 78,957 | 5.8 |
| 2017 | 340,136 | 38,236 | 10.1 | 18,829 | 16,895 | 47.3 | 593 | 4,418 | 88.2 | 1,293,745 | 79,740 | 5.8 |
| 2018 | 341,184 | 38,540 | 10.1 | 18,797 | 17,005 | 47.5 | 589 | 4,428 | 88.3 | 1,297,414 | 80,368 | 5.8 |
| 2019 | 342,222 | 38,806 | 10.2 | 18,724 | 17,113 | 47.8 | 577 | 4,433 | 88.5 | 1,290,139 | 81,106 | 5.9 |
| 2020 | 343,257 | 39,033 | 10.2 | 18,679 | 17,169 | 47.9 | 568 | 4,436 | 88.6 | 1,293,591 | 81,716 | 5.9 |
| 2021 | 344,058 | 39,207 | 10.2 | 18,668 | 17,183 | 47.9 | 566 | 4,433 | 88.7 | 1,296,408 | 82,230 | 6.0 |
| 2022 | 345,095 | 39,449 | 10.3 | 18,659 | 17,229 | 48.0 | 563 | 4,423 | 88.7 | 1,299,434 | 82,810 | 6.0 |
| 2023 | 345,883 | 39,767 | 10.3 | 18,642 | 17,303 | 48.1 | 559 | 4,428 | 88.8 | 1,301,903 | 83,430 | 6.0 |
(Notes)
- Underground installation rate = {Total circuit length of underground lines/(Total route length of overhead lines + Total circuit length of underground lines)} x 100 (%)
- Data for central Tokyo for FY1990 and thereafter are based on those for the entire wards of Chuo, Chiyoda and Minato.
- Figures are given for a total of 9 companies (except Okinawa Power Company) before FY1985.
