Gas
All bills can be brought and paid at the local post office (Poste.)
Heating may be centralized so it adds onto the condo fees. Otherwise, you'll
get billed by the gas company anyhow depending on the use. (It adds on to cooking
gas and comes all in one bill.)
Electricity
The electrical voltage in Italy is 220V / 50 cycles. Depending on your appliances
you may be able to buy adaptors convert them or it may not be worth the expense
and cheaper, as well as safer, to purchase new ones when you arrive.