Central combined heat and power plant near the property, noise?

attached is the plan

Some speculations: Regarding the size of the combined heat and power plant, I would say that it is a facility requiring approval. The combined heat and power plant itself is indeed below 1 MW FWL, but not by much. Since the combined heat and power plant is not likely designed to supply the heating network alone year-round, there will also be a boiler or alternative heating system present, which means that due to the addition rule, an approval requirement exists. At least theoretically, since some approval authorities see it differently - but maybe a joker in your hand. Do you know what kind of garden operation it is? If they primarily need heat, the combined heat and power plant will probably be operated heat-driven and thus not in condensation mode. In general, combined heat and power plants of this size are usually operated heat-driven in municipal utilities - there are of course positive and somewhat more innovative exceptions. When I look at the plan, I wouldn’t worry too much if you are not very sensitive. An opposite orientation of the garden would of course be positive, but even so, there is quite a large distance including a house in between, hopefully with a modernly built system. Maybe just wander around with a measuring app. That is of course absolutely inaccurate, but you might get a rough orientation - keep in mind that a combined heat and power plant (the engine itself, not the ancillary units) is a low-frequency noise source. Some people might perceive this as more unpleasant again.

Some speculations: At the size of the combined heat and power plant, I would say it is a system requiring approval. The CHP plant itself is under 1 MW FWL, but not far below. Since the CHP plant is unlikely designed to supply the heating network year-round on its own, there will also be a boiler or alternative heating system present, which means that due to the addition rule an approval requirement exists. At least theoretically, since some approval authorities see it differently – but maybe a joker for you up your sleeve. Do you know what kind of garden operation it is? If they primarily need heat, the CHP plant will probably be heat-controlled and thus not operated in condensation mode. Generally, CHP plants of this size at municipal utilities are mostly heat-controlled – of course, there are positive and somewhat more innovative exceptions. Looking at the plan, I wouldn’t worry too much unless you are very sensitive. A countermeasure orientation of the garden would of course be positive, but even so, there is a fairly large distance including a house in between, hopefully a modernly built system. Maybe just walk around with a measuring app. That is of course absolutely inaccurate, but you might get a rough orientation – keep in mind that a CHP plant (the engine itself, not the ancillary equipment) is a low-frequency noise source. Some people might perceive this as more unpleasant again.

Thank you very much, you are worth your weight in gold. I did not find this system in the data register, probably because it is not connected yet. Similarly sized gas-powered ones stand in some clinics in the area, but presumably well insulated somewhere deep in the basement. The garden operation is some kind of garden experimental station from the Environmental Office; it has been there for ages, I don’t even know if it will be connected to the heating network. It is somewhat reassuring since most people don’t have concerns. The lady from the property office told us that we are so far the only ones who have even asked this question. Well… In this area, a 10-year residence/registration obligation is also prescribed to avoid speculations, so you just have to live with the decision…