Profitability of maize cultivation for silage designated for an agricultural biogas plant was analysed. Research was carried out in the farm „ Rolfarm” Sp. Z O.O. located in the south-west part of Dolnośląskie Voivodeship. A farm, which carries out only plant production, was managing on the area of ca. 1000 ha of land out of which 793 ha were arable lands. In the researched season 2009-2010, maize designated for biogas was cultivated in the area of 100.31 ha which constitutes approx. 12% of share in sowing of agricultural lands. When selling silage for the outside recipient (Germany) in the researched period, the income from cultivation of 1 ha of maize was PLN 6,401.40, the cost of PLN 2,511.97 and profit for maize cultivation for silage was 3,889.43 PLN·ha-1, which gave the profitability index at the level of 2.54. However, the highest income which would be provided by the maize cultivation designated for grain, where for current prizes of purchase and the accepted average crop at the level of 7.5 t∙ha-1 the profit would be 4,657.85 PLN∙ha-1.