in figures


primary and secondary schools from


European countries implement the 50/50 methodology

98 891

pupils and

7 038

teachers undertake efforts to save at least


of energy consumed in their schools


European municipalities use the 50/50 tools and


of them participated in our training sessions


municipalities extend the 50/50 action to other public buildings


local strategies and


educational strategies include the 50/50 concept


EU-level initiatives support the 50/50 Network


project observers regularly follow the project and its activities


local, regional and national authorities were contacted to include the 50/50 concept in their strategies


persons participated in the 50/50 promotional and dissemination events

One of your main tasks within the 50/50 project is the calculation of energy and financial savings achieved in schools and/or non-school public buildings located on your territory. The methodology is very simple:

  • First – gather the necessary data: you need energy bills, average prices of energy and the degree day figures for your area. In case of electricity you need to collect this data for the relevant project year and the one year back before the project started. In case of heat you need to collect this data for the relevant year and the three years back before the project started.
  • Second – calculate savings in electricity: in order to calculate electricity savings subtract the consumption of the current year from the consumption in the year before you started the implementation of the 50/50 methodology. The result is the kWh you saved. Multiply these by the average price of electricity in the project year.
  • Third – calculate savings in heating: to calculate savings in heating we also compare the energy consumption with the reference period (three years back before the project started), but in this case we need to take into account the heating degree days1 when calculating the consumption figures. This is necessary to define the real saving result as the external temperature influences the energy consumption (the colder the weather, the more energy we need for heating).

In order to help you with the calculations we developed a special programme for calculating energy savings, which you can access here. There you can also find a more detailed description of the calculation methodology.

[1] "Heating degree days", or "HDD", are a measure of how much (in degrees), and for how long (in days), outside air temperature was lower than a specific "base temperature" (or "balance point"). They are used for calculations relating to the energy consumption required to heat buildings. (Source: