for sites and complexes
Efficiency potential is exploited and the degree of self-sufficiency is increased; security of supply for new and existing properties is ensured over the long term.
To exploit synergies, you need to plan the energy solution as a networked system from the beginning. One important aspect is the decentralised generation of electricity and the use and combination of local renewable energy sources for heating and cooling.
An energy management system records the energy flows of all consumers and producers and enables them to be optimally coordinated. This increases the flexibility and energy efficiency of the system while reducing costs.
Particular attention is paid to sector coupling, i.e. the intelligent networking of the heating, cooling and electricity supply, and mobility sectors. It makes it possible – including through storage and energy conversion technologies – to make better use of renewable energies and to draw as little energy as possible from outside.
ewz develops site-specific, integrated solutions for heating, cooling, electricity and mobility – both for existing buildings and for new buildings with different uses. If customers opt for an energy-as-a-service model, they can save both time and money while ensuring greater security of supply.
When planning integrated energy solutions, the following aspects need to be taken into account:
Heat and cooling from local renewable sources
Thermal networks are a good way of supplying sites or complexes with CO2-free or neutral local heating and cooling. They can be implemented and operated on different scales and at different temperature levels:
- The energy for high-temperature networks largely comes from wood or the waste heat generated by waste incineration plants, while
- networks with low to medium temperature levels often use geothermal heat, lake and river water, ground water and waste heat (from computing centres, for example).
- The lowest operating temperatures are achieved by anergy networks or low-temperature networks, which also cool buildings in summer with the free cooling method.
To increase efficiency, different grid types and energy sources can be combined (see Côté Parc and Greencity).
Harness solar power with a high rate of self-consumption
To make increasing electrification as climate-friendly as possible, more electricity from renewable sources, such as solar power, is needed. It can be used on site for the operation of household appliances, lighting and heat pumps, as well as for cooling buildings.
A self-consumption association (ZEV) maximises the amount of energy consumed on site, which means that the photovoltaic installation is paid off quicker. What’s more, solar power is often cheaper than electricity from the public grid for ZEV participants. Local electricity communities (LEG), which are expected to be introduced in 2025 or 2026, enable solar power supply across properties and use the distribution grid.