REGIONAL Queenslanders could see their power bills drop by about $20 this coming financial year under a new determination by the Queensland Competition Authority.

But they will also receive less back from solar with the QCA setting the mandatory feed-in tariff for regional customers in 2018-19 at 9.369 cents per kilowatt hour, down from last year's feed-in tariff of 10.102 c/kWh.

That does not affect those locked into the 44 cent tariff, however.

QCA chair Roy Green released the body's final determinations on both regional power prices and the solar feed-in tariff this morning.

"Annual bills will decrease by 1.3 per cent for a typical customer on the main residential tariff (tariff 11) and 3.4 per cent for a typical customer on the main small business tariff (tariff 20)," Professor Green said in a statement.

"The exception is a small increase (0.6 per cent) for typical residential customers on a combination of tariff 11 and controlled load tariff 31.

"The annual bill for a typical customer on the main residential tariff will decrease by $20 from $1542 to $1522.

"For the typical customer on the main small business tariff, the annual bill will decrease by $86 from $2568 to $2482."

Professor Green attributed the decreased bills to a decline in network costs and the cost of wholesale energy.

"However, the network and wholesale energy cost decreases have been partially offset by higher costs associated with the Renewable Energy Target (RET)," he said.