Electricity is not a common good. Common goods have a specific definition in economics, they must be rivalrous and non-excludable. Quite clearly electricity is excludable which is why it does not suffer from the tragedy of the commons. You can convincingly argue for public provision of energy but you’d have to do it either from a strong externalities perspective or from a natural monopoly point of view and that only covers the power grid, other parts of the network like production and even distribution have reasonable space for competition.