In order to promote this change and give impetus to the exemplary role of the administration, it has been legally defined the obligation that any subsidiary administration or dependent entity when acquiring a new vehicle, or has to replace the existing ones, be carried out with zero emissions vehicles (Z) and ECO (E), only in very specific cases, where the needs justify it, and after evaluation of the ministries responsible for the purchase of vehicles of the vehicle park and the Office of Energy and Climate Change, other vehicle types can be acquired.