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After the start of the enera project at the beginning of the year, we meet with more and more people, get to know their needs and ideas and orientate our actions accordingly.
It is bitterly cold this Friday morning in January. Lars Gruhnert and his wife Sabine Meyer are just back from their Christmas holiday. The house in Büppel, a district of Varel, was built at the end of the 1990s and was designed from the outset for sustainability and resource conservation. By the alignment of the house, insulation beyond the standard of that time, high-quality glazing, but also with the distribution of living space with a generous open living-cooking dining area, we have taken into account the overall balance sheet," explains Lars, who works selfemployed as an IT consultant, also from home.
However, an initially planned green roof was not realized on the main roof because there were doubts about the roof pitch. This was then built on top of the extension and so there is also a large rainwater tank for garden irrigation. The solar thermal system had been installed from the very beginning, and the photovoltaic system, which covers almost the entire southern half of the roof, was added some time later, adds Sabine.
The two want to use the produced electricity as far as possible by themselves, and they agree that what is still being fed into the grid should also be used in a sustainable way. But they don't want to worry much about the use of electricity in the house. "It would be nice," says Lars, "if it were automated, intelligent, networked and as efficient as possible in-house."
Lars Gruhnert is aware of the problem when it comes to PV electricity. The subsidy from a feed-in tariff is finite: "Maybe some of them will then rebuild their plants. I wouldn't know how to prevent that. Then new capacities would also have to be created as replacements."
When the funding ends, it requires an intelligent meter and networking - even with affordable, proprietary or central, shared storage systems. And connection to a market system. Lars: "I can't sell the electricity myself if I have too much."