Giant miscanthus and maize produced high DMY (25.3 and 22.7 Mg ha⁻¹ y⁻¹).

Giant miscanthus and maize delivered high energy outputs (468 and 404 GJ ha⁻¹ y⁻¹).

The energy input per 1 Mg of giant miscanthus DMY was determined at 0.74 GJ.

In the others crops, the production of 1 Mg DMY required 1.5–3.6-times more energy.

The highest energy efficiency ratio was obtained for giant miscanthus production.