The Australian Energy Regulator's annual report for 2015-16 published this week revealed the median yearly gas bill in the ACT was $1688, almost $500 more than the second-highest yearly bill in Victoria.

While ACT residents were on average paying more than double what Queensland gas customers were paying, it isn't all bad news for energy users in the capital.

The report also found the territory had the lowest electricity prices in the country, with the median yearly bill coming in at $1244 ahead of NSW, South Australia and Queensland.

Meanwhile, Tasmanians have the highest energy bills in Australia, forking out almost $2000 per year.

The report did not include energy affordability for customers in Western Australia or the Northern Territory.

Regulator chair Paula Conboy said a lack of competition in the energy sector was a reason for the high gas prices in the ACT, with ActewAGL owning 93 per cent of the market.

"There's a lot more competition in the gas markets in NSW and Queensland, but there's only one gas retailer in the ACT," she said.

"Part of the reason that electricity prices in the ACT have come down is the entrance of new retailers and providing pressure."

Among the other findings in the report, ACT gas customers had the largest rate of owing debt, with more than 7 per cent owing money.

The average debt almost doubled in the last financial year from $442 in 2014-2015 to $833.

The number of those owing debts for their electricity bill was the second-highest in the country, with 2.7 per cent still having money outstanding.

However, despite having some of the largest energy debt rates in the country, the ACT has the lowest number of people on hardship programs.

While the number of those on hardship programs for electricity has declined from 0.42 per cent to 0.37 per cent, those receiving financial assistance for their gas bill has increased to 0.68 per cent.

"It's important when customers are seeing there's issues with paying their bills to contact their providers right away," Mrs Conboy said.

"Retailers have an obligation to help customers that are experiencing problems with paying their bill."

It comes as the number of homes disconnected from either gas or electricity services rose 12 per cent in the ACT during the last financial year.

Warwick Fulton is the president of St Vincent de Paul Society in the ACT, which offers financial assistance for people struggling to pay their energy bills.

He said while he hasn't noticed a considerable change in the number of people seeking help, the period after winter sees a spike.

"At this time of year it does increase a bit because people are receiving their winter bills and if they haven't paid them by now they're getting into strife," he said.