Ministry of Internal Affairs and Communications monitors the electricity expense monthly.
The data below show the changes in the price indexes of electricity expense between 1970 and 2014, if the price in 2010 is taken as 100.
| Year | Index (2010 = 100) | 441KW electricity bill (yen) |
| 1970 | 67.7 | 7545 |
| 1971 | 67.6 | 7534 |
| 1972 | 67.4 | 7512 |
| 1973 | 67.3 | 7501 |
| 1974 | 76.9 | 8571 |
| 1975 | 80.6 | 8983 |
| 1976 | 86.7 | 9663 |
| 1977 | 96.2 | 10721 |
| 1978 | 94.6 | 10543 |
| 1979 | 94.6 | 10543 |
| 1980 | 127.0 | 14154 |
| 1981 | 137.8 | 15358 |
| 1982 | 138.5 | 15436 |
| 1983 | 138.5 | 15436 |
| 1984 | 138.5 | 15436 |
| 1985 | 138.5 | 15436 |
| 1986 | 131.6 | 14667 |
| 1987 | 122.3 | 13630 |
| 1988 | 119.4 | 13307 |
| 1989 | 116.6 | 12995 |
| 1990 | 115.5 | 12872 |
| 1991 | 115.5 | 12872 |
| 1992 | 115.5 | 12872 |
| 1993 | 115.2 | 12839 |
| 1994 | 113.7 | 12672 |
| 1995 | 113.4 | 12638 |
| 1996 | 110.1 | 12271 |
| 1997 | 114.0 | 12705 |
| 1998 | 109.6 | 12215 |
| 1999 | 107.4 | 11970 |
| 2000 | 108.1 | 12048 |
| 2001 | 106.6 | 11881 |
| 2002 | 104.2 | 11613 |
| 2003 | 102.0 | 11368 |
| 2004 | 101.5 | 11312 |
| 2005 | 99.0 | 11034 |
| 2006 | 99.7 | 11112 |
| 2007 | 100.1 | 11156 |
| 2008 | 103.8 | 11569 |
| 2009 | 103.2 | 11502 |
| 2010 | 100.0 | 11145 |
| 2011 | 102.8 | 11457 |
| 2012 | 108.8 | 12126 |
| 2013 | 116.6 | 12995 |
| 2014 | 126.0 | 14043 |
The next graph shows the changes in the electricity expense for a month (441kW) from 1970 to 2014.
Source is Statistics Bureau. 消費者物価指数 (CPI) 結果
www.stat.go.jp/data/cpi/historic.htm
www.e-stat.go.jp/SG1/estat/Csvdl.do?sinfid=000011288564
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