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Methodology
A methodology with a solid base creates confidence and provides certainty for the right decisions.
Methodology

The ETW methodology is developed, maintained and validated by independent scientific institutes (Ifeu, Infras and Fraunhofer IML). More than eight scientists, each with their own expert knowledge, regularly contribute to ETW. In addition, the IVE mbH team translates the methodological specifications into program codes and provides customer support.

The result is worldwide unique because ETW calculates the transport distances, energy consumption, greenhouse gases CO2 and CO2 equivalents as well as air pollutants SOx , NOx, NMHC and PM10 for any global transport chain.

The greenhouse gases are determined on the basis of fuel consumption. For this purpose all common types of fuel, including country-specific biofuel admixtures are covered in ETW.

The air pollutant emissions depend on the specific vehicle and its technical characteristics as defined by the emission class. The sources used to calculate energy consumption, greenhouse gases and air pollutants are state-of-the-art and are continuously updated by our methodology partners. It goes without saying that the methodology includes EN 16258- and GLEC-compliant calculation of the upstream chain and always shows the detailed emissions for Well-To-Tank (WTT) and Tank-To-Wheel (TTW). The complete methodology of ETW is published in the detailed methodology report. The correct application of the methodological specifications was validated by the institutes involved and officially confirmed (“Methodology Confirmation”).

Download Methodology Report here (Update 27.9.2019):
Short Version | Detailed Version

Transport sections in ETW are calculated by the steps below
  1. Definition of the route by the internal routing algorithm and detailed transport-specific GIS data networks
  2. Splitting the route into relevant sections for a calculation with specific parameters, for example road transport or the electricity mix in different countries
  3. Calculation of the respective basic emission parameter and the basic consumption curve depending on the transport description (e.g. vehicle, emission class) and the characteristics of each section
  4. Determination of energy consumption and emissions with a corresponding calculation formula based on freight, base emission factor, route length, freight allocation, load factor and empty runs per relevant section
  5. The sum of all relevant sections indicates the total energy demand and the total transport emissions

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ETW at a Glance
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ETW at a Glance
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