The £30m thermal hydrolysis digestion plant is being built for Yorkshire Water at its Esholt waste water treatment plant.
The new plant will resembles a large pressure cooker and will produces gas from sewage sludge.
The new plant is one of a series of projects coming through the pipeline to reduce the water company’s annual electricity bill of £45m.
In 2010/11, use of its own renewable energy sources produced around 10% of the company’s electricity needs.
It aims to increase this figure to around 15% by the end of 2014/15, and to more than 20% by 2020.
Ultimately, the waste water treatment works will be 100% self-sufficient in energy production making it by far the greenest plant.