Though only one has been seen, there is an entire network of them. The one seen is located on an island at the center of an artificial lake surrounded by a high wall.
The power station somehow extracts etheric energy from the earth, then filters and transmits it through antenna arrays, this is seen as an intense beam stretching into the horizon.
The known station collects energy through evaporating water somehow, though others might work differently.
The purpose of extracting etheric energy is only known to be for unknown experiments. Every now and then it releases ether into the air and it starts to rain, this rain is sometimes able to relieve Zimmy of her hallucinations, though it can also make it even worse, so much that she'll end up in Zimmyngham.