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Definition

What is an energy efficiency indicator?
An energy efficiency indicator is an indicator used to assess the progress in energy efficiency and to measure energy savings.
Related question
- What does “observed” mean for energy efficiency indicators?
- What are the different types of energy efficiency indicators?
What is the definition of energy savings in ODYSSEE?
Energy savings calculated in ODYSSEE correspond to top-down energy savings, i.e. to savings linked to the decrease of a specific or unit consumption: they correspond to the energy not consumed because of a reduction in the indicator value. For instance if the unit consumption of refrigerators decreases from 400 to 300 kWh between 2000 and 2015 in a country with a stock of refrigerators of 2 million units, the energy savings in 2015 are equal to (400-300)*2*106 = 200*106 kWh = 200 GWh (compared to 2000). In other words, without these savings, consumption would have been 200 GWh higher in 2015.
Related question
- What is the difference between unit energy consumption and specific energy consumption?
- What are the differences between “bottom-up” and “top-down” indicators?
What is the definition of final energy savings?
Final energy savings refer to the energy savings of final consumers, i.e. industry, buildings (i.e. residential and services), transport and agriculture, measures with the same definition as the final consumption (in particular to convert electricity into energy units).
What are negative energy savings?
Negative energy savings correspond to the fact that specific energy consumption is increasing instead of decreasing, which raise the energy consumption instead of reducing it as would be the case if there were energy savings. Such an increase is generally due to non-technical factors (behaviours, operational issues, as with low capacity in industry and freight transport).
What is the difference between gross and technical savings in ODYSSEE?
Gross savings, also called apparent energy savings, is the result of a calculation based on the observed variation of specific or unit consumption. Technical savings are corrected to account for the fact that technical efficiency cannot get worse: they are equal to the gross savings minus the negative savings; in other words, they do not take into account the negative savings.
What is the meaning of annual additional savings?
Annual addition savings measure the energy savings compared to the previous year, i.e. due to the decrease of the specific or unit consumption between year t-1 and t. They are also called annual new savings.
What is the meaning of cumulated energy savings?
Cumulated energy savings can have two meanings: they can cumulate the annual new savings over a period or cumulate (“cumulated new savings”) or the total amount of energy not consumed (“cumulated savings”). The second definition corresponds to all the savings registered year after year since a reference year, i.e. to the definition used in the Article 7 of EU Energy Efficiency Directive (EED).
Related question

Methodology

How are energy savings calculated in Odyssee?
Energy savings are calculated by sector from the ODEX indicator, as ODEX is equal to the ratio between the energy consumption at year t (E) and a fictive consumption that would have happened without energy savings (ES):
ODEX = E/(E+ES)*100 --> ES = E x ((100/ODEX)-1)
Example: if consumption = 50 Mtoe and ODEX = 80 --> ES = 50* ((100/80)-1) = 12,5 Mtoe
Related question
- What is the definition of energy savings in ODYSSEE?
What is the indicator used to measure energy savings in services sector in Odyssee methodology?
In Odyssee, the energy savings in services sector are calculated from the variation of the unit consumption per employee; a unit consumption per m2 of floor area would be more relevant but not enough countries can provide data on the floor area.