Due to the publication of fuel prices from December 2012 to February 2012 (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 2012 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 2012 (PDF 21.5KB)