Calculation approach for impact measurement
All calculations in the monitoring of the GGF portfolio follow the approach of the EU directive 2006/32/EC on energy end-use efficiency and energy services. eSave is using the bottom-up approach with data and methods based on estimates as defined in the directive in Annex IV.
Energy savings reported by the GGF are always related to primary energy savings. Based on final or useful energy savings, this energy will be translated into primary energy. This calculation uses primary energy factors provided by the German energy savings regulation (EnEV) for fossil fuels and own calculations for the national power mix based on data from IEA and/or national authorities.
The calculation of CO2 emission reduction is based on CO2 emission factors defined by IPCC 2006 guidelines for fossil fuels and country specific calculations for the national power mix based on data from IEA. Country specific grid losses based on data from IEA are also taken into account.
Each technical measure is calculated separately, interactions between several measures are not taken into consideration.
For measures where the local climate conditions have influence on the achieved savings (e.g. building envelope improvements), the country specific climatic regions are considered.
For measures where savings are based on the usage time of the measure (e.g. process related equipment, lighting), typical annual load hours are defined and considered.
GGF always reports savings per year. The monitoring software eSave however also keeps track of total savings based on estimated technical lifetime of the specific technical measure (e.g. 30 yrs for building envelope insulation) or lifetimes according to depreciation period.
Energy and CO2 savings achieved by new renewable energy projects are calculated based on the replaced conventional energy supply from the national grid or replaced fossil fuels.