Tokyo, May 28 (Jiji Press)--Electricity bills are expected to rise at nine of Japan's 10 major power utilities in June, driven by rising crude oil prices amid the tense situation in the Middle East. Monthly bills for an average household will rise by up to 91 yen, according to announcements made by the companies Thursday. Monthly bills at four major city gas companies will rise by 20-24 yen. The impact of soaring fuel prices is expected to be fully reflected in electricity and gas rates from summer. The government has decided to subsidize electricity and gas charges for use from July to September, when demand for air conditioning is high. The subsidy program is expected to cut power bills by about 1,500 yen to 2,000 yen per month. After subsidies are introduced, electricity and gas bills are expected to be lower than last summer's levels. Okinawa Electric Power Co. will see the steepest rise among the nine power companies, with the monthly bill for a standard household using 260 kilowatt-hours per month rising by 91 yen to 9,325 yen. At Tokyo Electric Power Company Holdings Inc., the bill for a standard household will rise by 28 yen to 8,823 yen. Bills will stay flat at Kansai Electric Power Co. Of the four city gas providers, Tokyo Gas Co. and Osaka Gas Co. will see the biggest increase in monthly gas bills, at 24 yen. Electricity and gas charges for June are set based on fuel prices from February to April. Although crude oil accounts for a small proportion of the power supply mix, the sharp rise in oil prices will affect bills. END [Copyright The Jiji Press, Ltd.]