You will have to request additional payments via the resolution centre. Airbnb will e-mail the guest and if he accepts they will charge his card but if he does not accept then unfortunately they won't be able to charge him.
Although you have mentioned it will be deducted from Security deposit, it is not a damage or repaid as such cannot be enforced. I would suggest you review you listing and make allowance in your nightly rate for electricity. Alternatively, you can add a line to your listing description to explain this but you will always be at the mercy of the guest agreeing to this payment and if the guest has checked out by the time you make this request then there is every possibility that they may not approve such extra charges.
BW, Ama