The objective of this case study is to analyse the effects of improving the efficiency of a 15kW induction motor in various countries with different energy mixes. The results show that an improvement of efficiency has higher environmental benefits in countries with an electricity generation based on fossil fuels rather than renewable energy sources or nuclear. Electricity mixes from EU25, France, Germany, Poland and Austria were used.
The same efficiency increase (Eff2 to Eff1 class) in a motor leads to a saving of 31 tonnes of CO2 in Poland, but 3 tonnes in France. This contrasts with the reduction of primary energy consumption: 330 GJ in Poland and 415 GJ in France.
A recent post explains the problem: we can prove 'whatever' we want with a study. It is now opened once again: