Households across Northern Ireland are being told to shop around when it comes to their electricity provider.
The Utility Regulator is urging more consumers to engage with the market to save money on their bills.
Six electricity suppliers operate in Northern Ireland, offering 52 different tariffs.
The current difference between the most expensive and cheapest tariff available is more than £400 for the year, based on average consumption.
However, Electric Ireland is in the process of exiting the domestic market.
The Dublin-based firm will continue to supply business customers in Northern Ireland.
Last year, 121,000 consumers switched electricity providers, representing a small proportion of the whole market.
That is the highest number of switches in seven years.
Power NI, the biggest supplier in Northern Ireland, is increasing its price from 1 December, adding around £38 a year onto a typical household bill.
Electricity prices remain around 70% to 80% higher than they were three years ago.
Colin Broomfield, director of markets at the Utility Regulator, told BBC News NI that most consumers still do not engage with their suppliers or switch.
"The key message we want to get across is for consumers to actively engage with the market," he said.
"Make sure that you look around, use tools to compare prices, and that will help inform your decision and make sure you are on the best tariff available.
"It is simple to engage with the market.
"The process of switching is straightforward and the money you could save can be significant, saving you potentially hundreds of pounds."
It is important to shop around, using information from each supplier or comparison tools.
Any saving is an estimate or guide, as actual usage may differ month to month.
Different switching tools may also provide varied information on savings, depending on whether or not they build in planned price increases.
You can keep the same supplier but change to a different and cheaper tariff.
Your tariff refers to the amount of money you pay per unit of electricity used, with suppliers offering different tariffs.
In order to switch, you have to be the account holder.
Your most recent energy bill will include the required details, such as the Meter Point Reference Number (MPRN), which is an 11-digit number.
It will also tell you which tariff you are currently on, how much energy you use in a certain period, or how much you spend on your bills.
A meter reading is often required as part of the switching process.