The commission may require a public utility to establish, provide, and maintain as a part of its system of accounts, continuing property records segregated by the year of placement in service, including a list or inventory of all the units of tangible property used or useful in the public service, identifying the property by location and project. The commission may require a public utility to keep accounts and records in a manner that shows the original cost of the property when first devoted to the public service, and the current related reserve for depreciation. A public utility with annual revenues exceeding $100,000 shall keep continuing property records.