A three-phase, renewable electricity grid is operated as the INES Smart Grid. Three photovoltaic generators with 2.16 kW peak power each and a 4.6 kW wind generator provide renewable energy. For the temporary storage of electrical energy, a stationary battery is charged, water is separated into the elements hydrogen and oxygen by an electrolyzer, or the traction battery of the battery electric vehicle is 'refueled.' As energy consumers, three offices of the Georg-Dietrich Bilding are integrated into the grid. In the evening or on cloudy days energy is supplied from the stationary battery or from converting the stored hydrogen into electricity through a fuel cell.
The intelligent control of each component is realized via a predictive energy management, which considers weather and demand forecast data. The automation and communication structure is based on SPS. This forms the backbone of the energy management system, which includes monitoring the grid states, controlling the various components, and predicting energy production and demand.