• Data reference period
• Geographic localization (Portugal)

• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).
• PRIMARY ENERGY:  Energy that can be used directly or that will be transformed, including the energy used in the transformation processes and the inherent losses in those processes.
• TONNE OF OIL EQUIVALENT:  Measurement unit of energy: 1 toe = 10^7 kcal
• REGULAR PUBLIC PASSENGER TRANSPORT:  Transport service with the following characteristics: a) allows access to the entire population; b) has predefined schedules, frequencies and periods of operation; c) has fixed routes and stops and defined origins, destinations and areas of operation; d) operates continuously; e) has published tariffs; f) is made public.

Sum(Annual savings by public passenger transport companies)/ 11209 ktep