Biogest has completed a 100% anaerobic digestion plant near Exeter, Devon, that can accept a variety of different grass-type feedstocks. The gas produced is being injected into the local gas grid.

The plant can be operated with a variety of feedstock including grass silage and fresh zero-cut grass. It can produce 1,000 m3/h to be fed into the grid.

Biogest, which has more than 150 bias plants producing gas or electricity across Europe, says the plant has high efficiency because the feed and mixing system uses little energy and it has low heat losses from the fermenter.