According to the statistical calculation, is the average monthly electric energy consumption in households just over 300 kWh (in 2010 the average monthly consumption was 314.58 kWh) however, that information does not reveal a lot, because the differences between households are considerable. Consumption namely depends on the size of household, number of electric appliances as well as of the quality and the intensity of use of those appliances.
Bellow is the information on the average annual consumption of various electric devices used in households, adapted from foreign literature and adjusted to the circumstances in Slovenia.
Electric immersion heaters (for heating water) - 2680 kWh/year
Heating water by using electric energy is still quite common in Slovenia. In most cases we use accumulation tanks (80 l or 100 l) which should be connected to electricity only during the period of lower daily tariff. More energy efficient is the ‘direct contact water heaters’ which have a higher connected load and thus need a stronger fuse. Connected load of electric heaters ranges from 2 kW to 3 kW and for the direct heaters up to 21 kW.
Washing machine - 300 kWh/year
Almost every household in Slovenia possesses a washing machine. They differ according to their performance, capacity and energy consumption. Class A+++ energy efficient washing machines consume 40% less electricity than those in class A. The same is valid also for the water consumption which should not be neglected. Water saving is namely also energy saving. Connected load for washing machines ranges from 1.2 kW to 3 kW.
Dishwasher - 410 kWh/year
Whatever is valid for the efficient use of energy for washing machines is also valid for dishwashers. The yearly consumption of energy for dishwasher depends on the number of household members, frequency of use which is related to the household members’ eating habits and the mode of use.
Dryer - 600 kWh/year
The use of dryers has been increasing in the past years, particularly in the cities, whereas energy consumption is significantly higher than with the washing machines. Energy saving dryers, which use the heat from the ambient air by using the installed heat pump, is already available on the market. The connected load for dryers is up to 3 kW,
Electric stove - 600 kWh/year
The consumption depends mainly on the eating habits, age structure and number of household members. Since electric stoves consume almost exclusively thermal energy, the correctly adjusted cooking temperature as well as the choice of pots and pans play an important role in energy saving. Nowadays, induction cook-tops have become fully established and are supposed to be the most energy saving stoves among all electric stoves. However, the fact remains that its nominal capacity is quite high, even up to 10 kW.
Refrigerator and freezer - 350 kWh/year
Besides lighting, rational use of electric energy has made the most significant progress in the field of cooling and freezing of food. ‘Energy saving’ refrigerator or freezer uses one half or even less energy of the energy used by a 5 years or more old refrigerator, technologically obsolete and used.
11 W and/or 20W energy saving light bulbs have replaced the classic 60W and 100 W inclondescent light bulbs, which represents an almost five fold energy saving. It is also a fact that high-quality energy saving light bulbs have a few times longer life span than the classic ones.
The arrival of new technologies has also contributed towards considerably reduced energy consumption. The new LED TV sets are energy saving devices; their consumption in the hibernation mode is minimal. However, the longer the device is on, the more energy it will consume and it is inadmissible that a device is switched on while nobody is watching it.
Other electric appliances and home office - 100 kWh/year
Small home appliances, even if we have a lot of them, do not consume a lot of energy, because their power is low and the time of use is short (a few hours per year), in fact, they actually consume less energy than some appliances for which we do not even know that they are constantly consuming energy. Information technology and communication devices represent an ever increasing energy consumer in our households. Such wide spread use of numerous devices brings hidden energy consumers which we sometimes do not even notice.
Air -conditioning devices
Over the past few years, we have been noticing that more and more households are equipped with air-conditioning devices. They usually opt to install them only in some of the rooms, so it is difficult to determine their average electric energy consumption. Besides that, most of those devices are not used merely for cooling, but in some periods also for heating. The connected load is from 1.2 to 10 kW. Due to their high level of efficiency, air-conditioning devices are not classified as energy wasting devices, providing, of course, that we use them appropriately.
Electric heating - from 7000 kWh/year
The number of households which use electric energy for heating is growing mainly due to the installation of heat pumps into new or renovated houses and flats. Such heating is supposed to be very efficient if the heat pump is installed in well insulated buildings and has the proper dimensions and settings.
Computers, HI-FI systems, telephones, telefaxes, alarm devices and other devices which enable the so called stand-by mode consume considerable amount of energy, although we are frequently not aware of it.