A Queensland council may soon turn human waste into energy.

Queensland's Logan City is trialling a gasification plant at the Loganholme Waste Water Treatment plant.

The $17 million facility will take biosolids - a substance composed of treated sewage – and use it to generate electricity and biochar, which can be used for agricultural purposes.

The council says ratepayers will save up to $500,000 a year from wastewater operation costs, and move closer to a goal for council operations to be carbon neutral by 2022.

Local firm Pyrocal has designed and built the plant, jointly funded by the council and the Federal Government, which contributed $6 million to the project.