220 CMR, 52.610-10
This account shall include monthly or periodic charges of the amount estimated to be necessary to provide for the retirement of property no longer used or useful in the conduct of the company's business, and for losses in value due to wear and tear not covered by current repairs.
The amount charged to this account shall be concurrently credited to balance sheet account No. 319, "Depreciation Reserve."
Until otherwise ordered, the amount estimated to cover the cost of property no longer used or useful in the conduct of the company's business, or for losses in value due to wear and tear, shall be determined by the accounting utility, based upon its best knowledge and experience in operation. A detailed statement of the basis used in determining the amount of such charge will be called for in the annual report to the Department.
220 CMR, 52.610-10