Landscape conservation and management measures produce large quantities of herbaceous biomass, which can potentially be used to produce biogas through anaerobic digestion. This report determines the biomass and energy potentials of the following habitat and green spaces in the canton of Zurich: wet meadows, reed beds, green spaces along transport infrastructures (national highways, cantonal roads, railway lines) and public green spaces within settlements. The results are projected for the whole of Switzerland. The total theoretical biomass potential of the investigated habitat and green spaces is 11'500 t dry mass/a, with an energy potential of approx. 52'000 GJ/a (Switzerland 97'300 t dry mass/a, 445'000 GJ/a). However, 40.7%, mostly originating from meadows and reed beds, is used in agriculture as animal feed and livestock bedding and therefore not available for biogas production, while 26.8% of the biomass is disposed and available. Since it mostly emerges from green spaces along roads it is also suitable for anaerobic digestion. Approximately 26.4% are decomposed as mulch, primarily in public spaces and along railway lines. But 18.8% emerge from public green areas, where mulch is sustainably used as fertilizer substitute. Although mulch of railway areas is not available due to operational and cost reasons, it is here added to the sustainably utilizable potential together with the disposed biomass. This said fraction has an energy potential of approx. 18'000 GJ/a in the canton of Zurich and approx. 90'000 GJ/a for the whole of Switzerland. This potential for the whole of Switzerland is equivalent to approx. 1.75% of the calculated energy potential for biogas in the Federal Energy Strategy 2050.