The first time I went to the RL Hearn Generating Station, I was without a tripod. The second time, I had about 40 minutes of daylight left. This room was pitch black (I think it's a 30 second exposure). Thanks to ZensLens for holding the flashlight. It works well with the shadows.
PS - the bottons in the control room do nothing, so don't worry. The world is safe. You can read more about about the generating station on Wikipedia.