Upon request, a transmission and distribution utility, as defined in Title 35?A, section 102, shall provide free of charge to current or prospective customers, tenants or property owners residential electric energy consumption and cost information for a dwelling unit for the prior 12-month period or figures reflecting the highest and lowest electric energy consumption and cost for the previous 12 months. The cost must include and separately identify the cost of the transmission and distribution utility’s services and the cost of electricity. If a unit has been occupied for a period of less than 12 months or for any other reasons the utility does not have information regarding electricity consumption or costs for a period of 12 months, the utility shall estimate the unit’s annual kilowatt-hour consumption or cost. The estimated cost must be based on the applicable standard-offer service price or default service price established by the Public Utilities Commission. Provision of this information is neither a breach of customer confidentiality nor a guarantee or contract by the utility as to future consumption levels for or the cost of the provision of electricity to that unit. For purposes of this section, “dwelling unit” includes mobile homes, apartments, buildings or other structures used for human habitation. [PL 1999, c. 657, §6 (AMD).]