CBS has the full episodes online. Pretty neat, definitely a different dynamic with no audience.
Last night Letterman was a guest on Jimmy Kimmel’s show.
I remember someone doing a show during a power outage? Jay Leno? I don’t remember how or why or who or what, but I DO remember there were no lights, just flashlights?
Conan did an episode of Late Night like that during the big blackout of 2003. They had an emergency generator at 30 Rock which provided enough power for a couple lights and one camera.
ETA: clip.