How do I bill electricity when renting through Booking.com?

Booking.com has no system to invoice energy separately, so you handle that in the property itself. With a module in the meter cabinet and a QR code for the guest, the guest purchases their own electricity credit in advance, independently of how the booking was made. On Booking, the night rate remains as always; you can however mention that electricity is invoiced separately. If there is little difference in consumption between guests, this is probably more trouble than it's worth.