Due to the publication of fuel prices from August to October 2009 (trade statistics 
prices for crude oil, liquefied natural gas (LNG) and coal published by Ministry of 
Finance Japan), a fuel cost adjusted unit price for January 2010 is fixed as per 
enclosure. 

Fuel cost adjustment system: 
"Fuel cost adjustment system" is a system designed to automatically adjust monthly 
electricity fees based on fluctuations in (actual recorded) fuel prices for crude 
oil, LNG and coal. 

 http://www.tepco.co.jp/en/customer/guide/fuelcost-e.html

Appendix: Fuel Cost Adjustment in Electricity Fees for January 2010 (PDF 19.1KB)