SSE Airtricity has said it will increase its standard household energy prices from December 3.
The company said the move is in response to further rises in external costs in recent months, including "unprecedented" increases in wholesale energy prices, as well as increases in electricity transmission charges.
SSE Airtricity said its standard price of electricity will increase by 6.3% or €1.18 a week, while the standard price of natural gas will rise by 6.9% or €1.01 a week.
The company said the planned increases are a result of external factors outside SSE Airtricity's control.
"Continued increases in wholesale fuel costs have seen the price of gas rise by a further 17% over the last five months, having increased by over 20% in the 12 months prior," it added.
"We've done everything we can to minimise the impact of this market volatility on our customers and we're committed to passing on any future savings as soon as we can," David Manning, Director of Home Energy at SSE Airtricity, said.
The company has 273,180 household electricity customers and 92,923 household gas customers here.