Due to the publication of fuel prices from December 2009 to February 2010 (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 May 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 May 2010 (PDF 17.8KB)