EN�K means saving money by saving power, and there is many way to do this.
You can open the windows on full and went quickly and efficently. you can install a savingshower, use savinglamps, use a thermostat to controle roomheating, install after-isolating if you need, set the temrature in youre hot water container to 65 degrees celcius.
This way to save power will cost you nothing in expenses for installing etc., but save power, and all you have to do is be more conscious about what choices you make about lighting and similar things.