What does the acronym ATR mean?
The acronym TRA means "Third-Party Remote Access", and refers to the permission that the distributor grants to the customer to be able to access the open market network. Red Eléctrica de España (REE) is the body responsible for guaranteeing this access.
It is a toll whose price is set by the corresponding Ministry, is periodically reviewed and includes certain costs such as transport and distribution, among others.