The charging standards of public utilities should be as far as possible that the government does not subsidize and it does not make much money  But this is hard to do because of the lack of a competitive market
Some public utilities are of a service nature, or in order to take care of the low-income class, the charges are low or even free and the costs are borne by all taxpayers
The low-income class needs to be taken care of by all sectors of society.