Businesses and municipality eager for innovative green gas project on Ameland


First practical test with a flexible method for producing green gas.

19 December 2018 – The Sustainable Ameland Agreement put plans for producing green gas on Ameland into action. AHPD Projects, Bareau Group, GasTerra, NAM, ASN Bank and the municipality of Ameland are planning to build a fully operational high-pressure digester on the island. The parties signed an agreement of intent to that end on 19 December.

The technology concerned, Autogenerative High Pressure Digestion (AHPD), uses an innovative process for the production of green gas that does away with the traditional disadvantages of conventional digestion. For instance, the process is flexible: both sewage sludge and kitchen waste can be digested in one installation. It is also anticipated that the ‘digestate’, the residue released when digestion takes place, can be used locally as a fertiliser. This makes the AHPD process efficient at national sewage treatment plant level.

The plan is to demonstrate the AHPD process on a small scale, appropriate for the sewage treatment plants on Ameland, in practice. This forms the subject of an agreement of intent signed today by AHPD Projects, Bareau Group (process owner), GasTerra, NAM, ASN Bank and the municipality of Ameland. It is the first time that AHPD will be applied in practice.

The declaration of intent sets out that the municipality will make land available, organise catering and kitchen waste collections and participate in an operating company that is to be established. GasTerra is pledging a financial contribution and purchase of the green gas produced at market rates, Bareau Group will provide technological expertise and licences, NAM is supplying a financial contribution and ASN Bank will help with financing. A subsidy from the Wadden Sea Fund is providing further support for the project.

“Soon we will not only be able to make green gas from sewage sludge,” says Bareau director Kirsten Zagt, “but also put kitchen waste in the reactor. That will produce a lot more gas and the yield will increase even further when we add hydrogen to the process. You can make green hydrogen from surplus sustainable electricity. If we apply this technology the gas network will then become the ideal storage facility for sustainable energy.”