Breakdown of ethanol production cost in SEK/L. Chemicals include enzymes. 'Others' refers to the cost of labour, insurance and maintenance. The cost of aerobic and ozone treatment was added to the capital cost: the cost of upgrading was taken into account by reducing the income of upgraded biogas. A summary of the scenarios is given in Table 1. REF: reference case; SEK: Swedish kronor; Upgr: upgraded.