Where do I find the rules for electricity pass-through in my country?

This breaks down into three separate questions for three different authorities. With the energy regulator, you ask whether and under what limits you may resell electricity to guests. With your accountant or the tax authority, you ask how an electricity allowance is treated fiscally within rental activity. With the municipality or building inspection, you ask whether requirements apply to electrical installations in short-term rental. There is usually no single authority that answers all three at once.