Sales companies who cancel guarantee of origin (GO) in own use shall inform specific disclosure. That should be public before 1st of July each year, cf. regulation 757/2012. 

The specific disclosure shows the percentage of canceled electricity produced by renewable means, or the amount of electricity for which guarantees of origin have been issued, in proportion to the company's total sales. When a sales company cancels guarantees of origin for its own sale of electricity, the importance of the origin of electricity produced by renewable means increases. Specific declarations are further stipulated in Articles 9 and 10 of the aforementioned regulation.