I've worked in a rail yard where we overhauled locomotive engine & traction alternator sets, which were generating upwards of 3.3MW so we used a big saltwater resistor as a load bank. It was the only bit of equipment that scared me, because the plates and tank were fairly rusty. I was waiting for it to let go midway through a test and flood the place with boiling salty water (and who knows what chaos the suddenly unloaded generator would have caused)