If random people are in your kitchen during parties, consider putting a lock on the main fridge so only people who live in the house can access it.
Also, if you have the space, consider buying an additional full-size fridge or two for personal food. Just make sure the fridges are energy saver models. Then ban individual fridges from people's rooms. Then you can have the main fridge in the kitchen for "community food" and the other fridge (located maybe in a hallway alcove or a kitchenette area) for personal food. For those hiding alcohol, they will just have to get used to drinking it warm
Switch to the flurescent light bulbs.
Hang thermometers in each bedroom and set a rule that the window air-conditioners can only cool the room to a certain temp (such at 70 dregrees). Have the house manager do random inspections and have a fine system if someone is below the temp.
Limit the number of appliances that can be plugged in at any one time. Not only can it drain power, but it can be a fire hazard as well.
Use the fire hazard excuse whenever someone complains about the new rules!