ADEME in France has recently released a new report: A 100% renewable gas mix in 2050?

Here you can read the summary in English
http://www.ademe.fr/sites/default/files/assets/documents/etude-100gazenr-gb-2018.pdf

Three production routes were included namely; Anaerobic digestion, Gasification and Power-to-gas.

For those interested I can recommend 5th International Conference on Renewable Energy Gas Technology, REGATEC 2018, 3-4 May in Toulouse. Here 60+ leading experts will present the latest advances within Anaerobic digestion, Gasification and Power-to-gas.

The conference will be opened by the Industrial Director of ENGIE, the President of the European Biogas Association and the EUROGAS General Secretary.

For more info www.regatec.org