I currently have a contract with the Reference Reseller Company and I am billed monthly, is the change mandatory?
According to Royal Decree 1718 of the 28th of December the change is mandatory, and addition at Endesa Energy we believe that this is a positive change since bills with estimated consumption will no longer be issued.
From April 1, 2013 onwards you will receive your bills every 2 months (bi-monthly) always with real readings.