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Indicator

Definition

What is ODEX?
ODEX (“ODYSSEE energy efficiency index”) is the indicator used to measure energy efficiency progress by sector. Its value is 100 for the base year; a value of 80 in year t means an improvement of 20%.
The detailed calculation of ODEX is explained in http://www.odyssee-mure.eu/publications/other/odex-indicators-database-definition.html

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What is the rate of energy saving in ODYSSEE?
The energy savings rate measures the rate of energy efficiency improvement over a period. It is directly derived from the energy efficiency index (ODEX): if ODEX = 80, the energy saving rate is equal to 20%.
The detailed calculation of ODEX is explained in http://www.odyssee-mure.eu/publications/other/odex-indicators-database-definition.html

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Methodology

How is calculated the energy efficiency index (ODEX) in industry?
The energy efficiency index in industry combines the energy efficiency trends by branch in one index (industry ODEX).
Energy efficiency trends by branch are measured from the variation of specific energy consumption, expressed in toe/t (or GJ/t) for energy intensive branches (steel, cement, pulp and paper) and toe (or GJ) per unit of production index (IPI) for the other branches.
To account for the different units used, all specific consumption is then expressed in index.
The industry ODEX is then calculated by weighting the indices of specific consumption by branch with the share of each branch in the industry sector’s energy consumption.
Up to 15 branches are considered for industry ODEX. The detail calculation is explained in http://www.odyssee-mure.eu/publications/other/odex-indicators-database-definition.html

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- What is ODEX?
Is ODEX cleaned from structural changes?
As ODEX is calculated by taking into account energy efficiency trends by branch, ODEX is not affected by structural changes between the different branches. It may however be influenced by structural changes within the branches (e.g. chemicals).
The detailed calculation of ODEX is explained in http://www.odyssee-mure.eu/publications/other/odex-indicators-database-definition.html

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- What does energy intensity at constant structure mean?
How is calculated the total energy efficiency index (ODEX)?
Energy efficiency progress for final consumers is evaluated on the basis of the different ODEX by sector for industry, transport, households and services, weighted by the share of each sector in the final energy consumption.
The detailed calculation of ODEX is explained in http://www.odyssee-mure.eu/publications/other/odex-indicators-database-definition.html

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