Empty room fridges in hotels

Was staying at a La Quinta Inn (chain hotel) this past weekend, and the room fridge was really loud. It was one of these 3.5 feet tall fridge. Lo and behold -- it is empty -- but cold as ice! What a waste of electricity! I unplugged it after some effort to drag it out so I could reach the wall plug at the back. Couple months ago, I was at Hotel Del Sol in San Fran -- and needed the fridge to store some leftovers -- and found that they had removed all mini-fridges to save energy. I wasn't that happy then but I was completely annoyed today to see such a huge empty fridge consuming unnecessary electricity for no good reason. Perhaps hotels should give us guests the option of plugging in the fridge or not.