Anaerobic Digestion

Nethy Energy, the trading name of Nethy AD Ltd, consults on and designs Anaerobic Digestion plants.

These AD plants provide an excellent inflation linked 20 year financial return with a typical annual income representing 15-25%+ of capital invested depending on each one's circumstances.

For AD plants of over 2 Mwh Nethy Energy advises that it is financially preferable to upgrade the biogas to biomethane (Biomethane to Grid/ B to G) and inject it into the UK's gas grid; if possible.

On advanced technical and detailed design matters Nethy Energy works closely with Rafael Salzberger and Martin Heeg of VBTS, a German Biogas developer from Leipzig. Martin Heeg has worked in the Biogas for over 10 years and has constructed over 50 AD plants; see download section for list.

Anaerobic Digestion - The Process

Anaerobic Digestion

Anaerobic Digestion (Biogas) has many benefits; this website is focused on advising and procuring the optimum financial ones. It is expected that a well designed and located Anaerobic Digestion plant (AD plant) can achieve a payback within 4 years especially if using 'free feedstock' and optimising the revenue from any heat use. Even one without the advantages listed below should achieve a payback within 7 years,

  • When designing the AD plant ensure that both electric and heat subsidies can be claimed
  • Minimise the AD plant's parasitic use of heat and electricity
  • Arrange beneficial sales of the heat and electricity
  • Use feedstock that has a low cost to you; slurry/ manure and your own purpose grown crops as well as using other on farm waste and other inputs
  • Maximise the financial benefit of the liquid and fibre digestate
  • For larger AD plants of over 2Mwh if possible Nethy Energy advises upgrading the biogas to biomethane and in injecting into the gas grid.
  • In the context of the current simplification of the UK planning system and its emphasis on sustainable development Nethy Energy advises thoroughly exploring the possibility of simultaneously gaining consent for other ancillary development which will have been enabled by the AD plant. In England most smaller "on site" agricultural and forestry AD plants now have some permitted development rights.

This website explains the various options.