Summary

Charles Evans Hughes Lindheimer v. Illinois Bell Telephone Company…

Broadly speaking, depreciation is the loss, not restored by current maintenance, which is due to all the factors causing the ultimate retirement of the property. These factors embrace wear and tear, decay, inadequacy, and obsolescence. [19] Annual depreciation is the loss which takes place in a year. In determining reasonable rates for supplying public service, it is proper to include in the operating expenses, that is, in the cost of producing the service, an allowance for consumption of capital in order to maintain the integrity of the investment in the service rendered.
Source: Wikisource

Charles Evans Hughes Lindheimer v. Illinois Bell Telephone Company…

The balances carried by the company include large amounts that never can be used for the purposes for which the reserve was created. In the long run the amounts thus unnecessarily taken from revenue will reach about one-half the total cost of all depreciable parts of the plant. The only legitimate purpose of the reserve is to equalize expenditures for maintenance so as to take from the revenue earned in each year its fair share of the burden. To the extent that the annual charges include amounts that will not be required for that purpose, the account misrepresents the cost of the service.
Source: Wikisource

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