It is always a consideration whether the further use of an older device does not require less energy or water than the production of a new, energy-efficient device. Therefore, the energy requirement along the entire product life cycle (from production to use to disposal) must be considered. Companies need the competence to weigh up the right time for a new purchase of devices, but also the determination to then purchase the most sustainable and not only cheapest devices.

LED 'light bulbs' are now available for really all lamps, even with pleasantly warm light colors. Also, think about the lights outside - are they LED as well?

We have to use all suitable areas for photovoltaics (PV), as the variants on open spaces restrict nature and agriculture. A trend is PV on stilts (Agri-PV), so that it can still be gardened or cultivated underneath. But that costs building material. Photovoltaics has become amazingly inexpensive today thanks to cheap panels from China. Unfortunately, there is hardly any money to make from the feed into the power grid, currently about 8 cents per kWh in Germany. Therefore, PV should always be combined with its own electricity storage (own step, see below) so that as much electricity as possible is consumed by yourself. This then saves approx. 25 to 35 cents per kWh (depending on your tariff), which we would otherwise have to pay to the electricity provider. In this way, your own PV system, adapted to your own electricity consumption, pays off after just a few years. If you have a car, you should take into account its consumption (even if it is not yet an electric car). Then the savings are much bigger. The banks like to give loans for PV, quite often it is also being subsidized. In addition, there are also providers who take over the costs and virtually rent the roof area and offer discounted electricity in return. Such providers then form so-called virtual power plants with other houses and their batteries. For such a dependency, you should inform yourself well about what is best for you.

An electricity storage system primarily helps to maximize the yield of the PV system if the electricity is not fed into the grid for little money, but comes out of the battery in the evening and then allows the full electricity price to be saved. Another advantage may be that some batteries work as an island system in the event of a power outage. The already mentioned virtual power plants then access your battery from the outside and make the electricity available virtually in the neighborhood and compensate you for it. In addition, power grids are stabilized and even with little wind and no sun, we can consume renewable energies. Note on lithium: Like many other raw materials, lithium is often problematic during mining. However, the life cycle assessment must take into account that we can recycle lithium for hundreds of years. In the basement, older lithium batteries from the automotive industry could also come to a second life later or, alternatively, sodium batteries that require more space.

Motion detectors make sense in all rooms including outdoor areas, where we potentially let the light burn for too long, for example in the hallway, basement, garage, etc. Of course, it is important that the light does not stay on for too long.

Modern lamps require little electricity, and yet it is worthwhile not to let them burn unnecessarily, for example when we are not in the room for a long time. Corridors, toilet rooms, cellars often have the light burning unnecessarily. In some indoor and outdoor areas, companies also sometimes have the light on too long or too early.

Apart from the fact that every device can have a high power consumption, a refrigerator is not regularly defrosted, the door seal is leaking, the washing machine is driven with too high temperatures and spin numbers, etc., there are still some unnecessary things that consume a lot of electricity: In the company, these can be exaggerated light installations, electric bollards, and much more.