Canberra homes using only electricity will see the cost of energy rise from July 1, while those on a mix of supplies will see little change with a corresponding fall in price of gas.
ActewAGL will reduce the price of natural gas from next month, meaning a gas bill drop of about $105 for a typical home using 43 gigajoules a year.
At the same time electricity prices in the ACT will rise, meaning an increase of around $100 a year for a typical home that consumes 8,000 kWh a year.
It means an overall neutral effect on their bills for people using both gas and electricity, but an increase for those homes solely on electricity.
The change to ActewAGL's electricity prices follows a decision by the Independent Competition and Regulatory Commission, which determined the average price of electricity for ACT customers would rise by 6 per cent.
ActewAGL said that was in part because its costs for the purchase of wholesale energy and compliance with the government's renewable energy target scheme had risen.
The gas decrease is due to ActewAGL passing on an energy regulator decision from May, which determined the price of distributing gas had fallen.
ActewAGL general manager Ayesha Razzaq said the changes would have a "minimal impact" on customers using both electricity and gas.
"For our customers who have electricity only, we will continue to help them manage their bills through a variety of support programs," she said.
"These include our free Energy Saving House Calls where customers can save up to $221 per year by moving to more energy efficient products.
"ActewAGL also has a number of flexible payment options to assist our customers. Many customers choose, for example, to have regular, smaller payments deducted from their accounts to manage their household budgets."