A default offer set by the Australian Energy Regulator would see prices for residential customers rise between eight and a half and 14 per cent in New South Wales, up more than 11 per cent in southeast Queensland and 7 per cent in South Australia.
About 10 per cent of Australian households - 550,000 customers - pay standard prices, the highest limit for energy providers.
Most Australians are joining other companies at cheaper rates, but they are likely to see larger percentage gains in the coming months.
