If the hotel wants to save electricity, you can put a small word on the room "please turn off the electricity when going out" ... and here when I go out, I open the door to turn off the power on my own (because I have keep the card from the power clip in the room) while I'm just going out to buy things a bit. Overall not very satisfied with this way of doing the hotel because if you miss what the guests? And the hotel business that wants to save electricity, I think it is difficult because most people want to regulate the room constantly to cool and cool when going out in the hot sun!