Sec. 684.1. Depreciation accounting

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(a) Depreciation charges shall be such that the loss in service value of the property shall be distributed proportionately over the property's service life. The depreciation rates shall be reviewed periodically and adjusted as required, so that the depreciation accrual will bear a reasonable relationship to the cost of plant in service, its remaining service life, the estimated net future salvage, and to the balance of the accumulated depreciation.
(b) The utility shall maintain a separate accumulated depreciation subaccount for each depreciable plant account and plant subaccount.

                    
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