Section 119. No charge for the use of a meter or for other similar purpose covering any portion of twelve consecutive months in connection with the supply of gas or electricity for domestic use only shall be made by a corporation, other than a municipality, furnishing the same, in addition to the charge for the gas or electricity delivered, if the consumer during such time uses electricity to the value of nine dollars or gas to the value of seven dollars; provided that, subject to the approval of the department, rates may be graduated according to the quantities of gas or electricity used, and, subject to like approval, such a charge may be made to customers furnished gas or electricity seasonally or under promotional rates or room or area rates. Whoever makes a charge contrary to this section shall be punished by a fine of not more than one hundred dollars. This section shall not apply to charges for sale or rental of appliances.