Same issue here.
The problem is the Geothermal Generator was working 100% normally after the patch. It was not until I hooked up a Compressor via 8 copper wires directly next to an Extractor and a Canning Machine that I had problems. Here is the series of events that led to my broken generator.
1) Generator powering a Macerator/Electric Furnace Directly attached to the generator on either side (works fine)
2) Ran copper wire 8 copper wire to the back of my Compressor, and then a single wire on either side to power the Extractor/Canning Machine directly next to (on either side) of the compressor
3) The Extractor worked fine under this setup as i ran over 2 stacks of Sap through it just fine
4) I put in some Snowballs into the Compressor (which showed a powered up machine) and it compressed 4 snowballs into Ice. At this time the Compressor actually ran out of power and would not compress anything else.
5) I also now noticed that the adjacent Extractor/Canning Machines were now no longer recieving power, but were operating on the little power they had stored up.
So it seems that once I actually RAN the Compressor (with snowballs) it short circuited my Generator.
The reason i think my Generator is now bad, is because the Generator has a full load of Lava, and even a full bucket of lava in its consumption area (its not consuming the lava). Also the Generator's built in battery level is NOT POWERING up. It stays at zero charge and will NOT charge itself up. I put a few RE-Batteries in the top slot, which DO charge still, but the internal batter which feeds the cables, will not. I have removed all the copper cable and replaced with gold cable, just in case; no change. I have removed all cables and tried to reprime the generator with new lava, nothing....