220 CMR, § 26.01
If any part of the terms and conditions of any company is in conflict with 220 CMR 26.00, such regulations shall be controlling.
Account: any agreement for service to a non-residential customer for which there is a separate bill rendered for such service whether or not such separate bill is rendered to the same location as any other bill by the same company.
Bill: a written statement from a company to a customer setting forth the amount of gas, electricity, or water service consumed or estimated to have been consumed for the billing period set forth in the company's tariff and charges therefor.
Company: a gas or electric company as defined in M.G.L. c. 164, or a water company as defined in M.G.L. c. 165.
Customer: any non-residential user of gas, electricity, or water service billed on a commercial or industrial rate as filed with the Department.
Department: the Department of Public Utilities, Commonwealth of Massachusetts.
Late Payment Charge: surcharge assessed by a company on the unpaid past due portion of the balance of a customer bill.
Receipt: in the case of a bill or notice required by 220 CMR 26.00, shall be presumed to be three days after the date of mailing, or if a bill or notice is delivered rather than mailed, on the date of delivery.
220 CMR, § 26.01