Electricity and heat biogas valorisation (cogeneration)

In France, anaerobic digestion, as a technique of producing renewable energy, benefits of an obligation of electricity purchase produced from biogas and from a specific tariff with a 15 year old contract. The tariff of purchase comprises :
- a basic tariff fixed according to the power of the biogas installation
- a bonus for energy efficiency defined according to the percentage of valorization of biogas into energy
 - a premium of 20€/MWh for anaerobic digestion

Before July 2006, EDF bought electricity resulting from biogas with 5.8 c/kWh. After July 2006, the tariff of electricity purchase by EDF is all the more important (basic tariff from 7.50 to 9 c/kWh up to 14 c/kWh) if produced heat is valued. Naskeo already deployed successfully boilers and biogas cogenerators on several sites.

On each one of our installations of biogas valorization, a flare of safety is installed so in particular burning biogas in the event of intervention on the boiler or the cogenerator. In addition, when biogas is charged in (H2S), of the systems of purification per injection of air are installed on the engines.

Moreover, in the case of the cogeneration, we can also study various possibilities of valorization of heat and in particular, the heating network, the mud drying, the units of drying of fodder in barn, of the greenhouses…