Customers will face higher electricity bills next month as Hong Kong’s two power suppliers will raise fuel-related charges, with the firms blaming geopolitical tensions and volatility in international energy markets.As electricity costs rise, CLP Power and HK Electric have introduced rebate and relief schemes as grass-roots households face higher air-conditioning costs after a summer with an unusually high number of very hot days.HK Electric, which supplies electricity mainly to Hong Kong Island and Lamma Island, said on Tuesday that its fuel clause charge would rise to 60.7 HK cents (7.74 US cents) per kilowatt-hour (kWh) in September.The charge will increase by 3.4 cents, or 5.9 per cent, from August, marking the fourth consecutive monthly increase since May. The fuel clause charge has jumped 1.3 times from 26 cents per kWh in May.Together with the basic tariff, the average net tariff will rise to 188.6 cents per unit in September, an increase of 1.8 per cent from August.“International energy prices remain volatile, with spot prices for liquefied natural gas having more than doubled compared with levels before the geopolitical developments earlier this year and still rising,” HK Electric said.