The Department of Energy and Climate Change has confirmed it will not change the biomethane to grid RHI tariff before 1 December 2014.

A consultation on proposed changes to support for gas-upgrading anaerobic digesters earlier in the summer sparked fears that projects at an advanced stage could flounder as investors cooled off.

But in a letter to stakeholders, former energy minister Greg Barker said while the consultation could not be pre-empted, the reassurance tariffs would remain at 7.5p/kWh for plants registered before 1 December gave developers enough certainty to get projects completed.