Plant Depreciation - Commission-Approved Depreciation Rates (Group vs. Unit Depreciation)
Recording annual straight-line depreciation on utility plant using PUC/FERC-approved composite rates by functional class, under the group depreciation method unique to regulated utilities.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Depreciation Expense (FERC Account 403) | Expense (+) | 485,000,000.00 | - |
| Accumulated Provision for Depreciation (FERC Account 108) | Asset (-) | - | 485,000,000.00 |
💡 Accountant's Note
Regulated utility depreciation is fundamentally different from commercial GAAP depreciation in a critical way: depreciation rates must be APPROVED by the PUC/FERC through formal depreciation studies. Utilities cannot simply choose a useful life — the regulator sets the rate after an independent depreciation study (filed with the PUC every 5–10 years). Utilities use GROUP DEPRECIATION (all similar assets depreciated at one composite rate) rather than unit depreciation (each item tracked and depreciated to zero individually). When a group asset is retired, any difference from accumulated depreciation flows to the regulatory system — NOT to income (unlike commercial accounting where a gain/loss is recognized on each disposal).
Practitioner & Systems Framework
💻 ERP Architecture
Apply the PUC/FERC-approved depreciation rate (expressed as a percentage of original cost per year) to the average plant in service balance for each FERC account. A single PUC-approved rate study covers all plant classes. Rate study recommendations (which may differ from the utility's proposed rates) create regulatory proceedings that can delay implementation of new rates.
⚠️ Audit Flags
Auditors verify that depreciation rates are the PUC/FERC-approved rates from the most recent depreciation study. Using rates higher than approved overstates depreciation expense (over-recovering from customers); using rates lower than approved understates depreciation (under-recovering, creating a future shortfall). The depreciation study is the key document — it must be current.
📄 Required Documentation
Most recent PUC/FERC-approved depreciation study, depreciation rates by FERC account class, plant balance by class and vintage, depreciation calculation workpaper, FERC Form 1 depreciation schedule, comparison of current rates to study recommendations.
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