As mentioned, I can't replace GTGs on Geysers, which were already build on since a few patches. (Don't know, which exactly, but it must be one before the repricing of GTGs because I didn't get enough material out of it to build a new one after deconstrucion.)
The blueprint just doesn't want to snap into position... always saying "You need to place this on a Resource Node!" (When I look at them, it says "Geyser can not be picked up! RP_Normal", so the place should be right ;P)
Other (before untouched) geysers seem to just work fine, the blueprint snaps in, it produces energy (what I checked) and can be easily deconstructed and rebuild.
Screenshots of bugged GTG-Placing and location on the Map