TEPCO Illustrated

Electricity Supply Facilities
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Underground Distribution Line Installation Rate

As of the end of FY2016

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

(Notes)

  1. Underground installation rate = {Total circuit length of underground lines/(Total route length of overhead lines + Total circuit length of underground lines)} x 100 (%)
  2. Data for central Tokyo for FY1990 and thereafter are based on those for the entire wards of Chuo, Chiyoda and Minato.
  3. Figures are given for a total of 9 companies (except Okinawa Power Company) before FY1985.