Thanks all.
It is not Norsk Hydro, I think they make fertilizier? It is a small powercompany specilizing in "small nature friendly" mountain based powerplants.
There are other ways to make power, of course, they are building a windmill park not far away on a very windy island. That doesnt help me as long as there are plans for making a powerplant "on my river".
I am back now, as the other landowners are involving the courts to clarify the rights of the fall. There are two of us not signing, the other has involved the nature protection agencies, so they are in the know.
The river was a major spawning place for salmon. And also the Norwegian National Bird the Cinclus Cinclus is laying eggs in these waterfalls, and there are only registered between 5000 and 25000 eggs laid each year in the entire country, so not a lot.
But, I really am stuck now, as I thought by not signing, it might just "go away". It wont. Can the court force me to sign? Can the court demand our rights sold to the other landowners? They own land along the river, but me and the other landowner not signing own on either side of one waterfall, while we own on both sides of the other waterfall.