1. Where a regulated entity claims that applying a specific monitoring methodology would incur unreasonable costs, the competent authority shall assess whether the costs are unreasonable, taking into account the regulated entity's justification.

The competent authority shall consider costs unreasonable where the cost estimate exceeds the benefit. To that end, the benefit shall be calculated by multiplying an improvement factor by a reference price of EUR 60 per allowance. The costs shall include an appropriate depreciation period based on the economic lifetime of the equipment.

2. Notwithstanding paragraph 1, the regulated entity shall consider costs of applying a specific monitoring methodology incurred by consumers of the released fuel streams, including by final consumers. For the purposes of this subparagraph, the regulated entity may apply conservative estimates of the costs.

For the monitoring and reporting of historical emissions for the year 2024 in accordance with Article 30f(4) of Directive 2003/87/EC, Member States may exempt regulated entities from justifying that a specific monitoring methodology would incur unreasonable costs.