TransCanada Pipeline has applied to the National Energy Board to hike the price it charges to move natural gas through the Canadian mainline pipeline.
For customers in Eastern Ontario, it could mean a 52 per cent jump in fees.
An the application comes less than a year after the board capped transmission fees and one day before natural gas rates were set to jump by 40 per cent.
The initial hike was approved on Friday by the Ontario Energy Board and means an extra $400 a year on average for Enbridge customers.
The new hike that is before the board will help maintain the current infrastructure and add more capacity to the network.
TransCanada said the boost to your bill is needed to broaden its pipeline in the province, giving them more access to cheaper sources.
The National Energy Board has several options, including an increase in fees, lower them or ignore the request all together.
A decision is expected in the next few weeks.