The cost of materials includes write-downs on raw materials and supplies amounting to Euro 730 thousand (previous year: Euro 1 108 thousand). Write-backs of raw materials and supplies due to increased net disposal prices are also included at Euro 0 thousand (previous year: Euro 609 thousand).

Expenses for purchased services mainly relate to expenses for grid utilisation fees, third-party services for operating and maintaining plant and the provision of personnel.

The rise in cost of materials is primarily due to the increase in energy procurement costs.