Giant cane is a promising non-food crop for biogas production. Giant cane and corn silages coming from full-scale fields were tested, in mixtures with pig slurry, for biomethane production by a continuous stirred tank lab-scale-reactor (CSTR) approach. Results indicated that giant cane produced less biomethane than corn, i.e. 174±10 N m(3) CH4 Mg(-1) TS(-1) and 245±26 N m(3) CH4 Mg(-1) TS(-1), respectively. On the other hand, because of its high field biomass production, the biogas obtainable per Ha was higher for giant cane than for corn, i.e. 12,292 N m(3) CH4 Ha(-1) and 4549 N m(3) CH4 Ha(-1), respectively. Low energetic and agronomic inputs for giant cane cultivation led to a considerable reduction in the costs of producing both electricity and biomethane, i.e. 0.50 € N m(-3) CH4(-1) and 0.81 € N m(-3) CH4(-1), and 0.10 € kW hEE(-1) and 0.19 € kW hEE(-1) for biomethane and electricity production, and for giant cane and corn mixtures respectively.
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