@Eilis2
I do believe that because we charge an all-inclusive price including gas and electricity and fire logs and barbecue gas that "fair use" is interpreted as "fair game".
Heating will be on, fire lit, cooking in the kitchen, doors open, internal and external lights on, barbecue lit, barbecue lights on (daytime), entrance foot lights and tree lights still burning from last night and heated town rail CONSUMING.
The easy way to account for this is to charge more.
The awkward way to deal with this is to be grumpy to guests, and stomp around switching off things.
What happens is we suck it up and smile.
Light switches and information about operation is communicated at check-in, but guests only manage to remember the 'switching on' part.
I mentioned recently that in our situation we could actually install a charge meter for both electricity or gas but I doubt that guests will appreciate that gesture. If you were a 'nearby' host who checks guests in then you could take meter readings on arrival and ask guests to send photos of the meters on departure to establish a cost? Or perhaps 'Smart Meters' might be able to account for consumption between two date points?
As you see, we have this user the radar, but have no solution as yet.
If you were counting the consumption, how would you make the payment request without incurring a negative hit on your reviews?