Revenue Requirement

A revenue requirement is the annual revenue that approved utility rates are designed to recover for eligible service costs, including operating expenses, depreciation, taxes, and an allowed return on the regulatory rate base, after applicable offsets. It is an authorized planning amount, not a guarantee that the utility will collect that exact revenue or earn the allowed return.

Revenue requirement connects regulatory accounting with customer rates. The regulator first determines the approved annual amount, then allocates it among services or customer classes and designs tariff charges intended to recover it.

Key Takeaways

• Revenue requirement is an annual currency amount, while the allowed rate of return is a percentage.
• The return component equals the allowed return multiplied by the approved rate base.
• Other operating revenue and customer-related credits can reduce the amount recovered through core rates.
• Billing volume, weather, customer usage, and collection experience can make actual revenue differ from the authorized amount.
• Formula rates, riders, and true-ups may update or reconcile selected components without reopening every issue.

Formula

A simplified cost-of-service revenue requirement is:

Where:

• (O&M) is approved operation and maintenance expense
• (D) is depreciation expense
• (T) is taxes or other included assessments
• (r) is the allowed overall return
• (B) is the approved rate base
• (A) represents other approved additions or adjustments
• (OR) is other operating revenue or credits

The formula is a teaching model. A filed revenue-requirement schedule can contain many more items, such as fuel adjustments, pension costs, regulatory amortizations, decommissioning, customer contributions, or jurisdictional allocations.

Worked Example

Suppose a regulator approves:

The return allowance is $600 million x 7% = $42 million.

The approved annual revenue requirement is $245 million. If the forecast contains 10 million billing units, a simple average would be $24.50 per unit. Actual tariffs rarely use one undifferentiated rate: charges may vary by customer class, demand, usage, season, location, service level, or fixed-cost responsibility.

Revenue Requirement vs. Related Concepts

Confusing these values can produce large analytical errors. A 7% allowed return does not mean 7% of customer revenue is profit, and a $245 million requirement does not mean every customer class is allocated the same average charge.

How Authorized and Actual Revenue Diverge

Actual revenue can differ because of:

• warmer or colder weather than forecast
• customer growth, conservation, or industrial load changes
• outages, service interruptions, and collection losses
• delayed effective dates or regulatory lag
• fuel, purchased-power, tax, or other adjustment mechanisms
• decoupling, riders, trackers, refunds, or later true-ups

Some mechanisms are designed to reconcile selected forecast differences. Others leave the utility or customers exposed until a later proceeding.

How to Review a Revenue Requirement

1. Identify the regulator, utility service, jurisdiction, docket, and effective period.
2. Reconcile each expense component to the test-year evidence and approved adjustments.
3. Recalculate rate base and the allowed return component.
4. Confirm taxes, depreciation, other revenues, and regulatory amortizations.
5. Trace allocations between jurisdictions, functions, and customer classes.
6. Compare billing determinants with the forecast used to design rates.
7. Identify riders, true-ups, caps, sharing provisions, and refund obligations.

FERC’s electric transmission formula-rate guide explains how major cost components combine into annual cost of service and how formula inputs can update. FERC’s natural-gas cost-of-service page describes the opportunity to earn a reasonable return as part of regulated service cost. The governing order and tariff remain controlling for a specific case.

Risks and Limitations

• A summary amount can hide disputed costs or allocation assumptions.
• Forecast demand may not match the period in which rates are effective.
• Settlements can produce a total requirement without resolving every individual component.
• Accounting changes do not necessarily flow into rates immediately or automatically.
• A revenue requirement may cover only one service, jurisdiction, or regulated entity within a larger company.
• Regulatory orders and formulas can change, and an approved amount may later be adjusted or refunded.

Related Terms

• Cost of Service: The approved cost framework supporting the revenue requirement.
• Rate Base: The regulatory investment value used in the return calculation.
• Rate-of-Return Regulation: The framework in which approved cost and return establish revenue.
• Rate Setting: The process that translates the requirement into approved tariff charges.
• Public Utility Commission (PUC): A state-level U.S. body that may approve utility revenue requirements.

FAQs

This material is educational and is not legal, regulatory, accounting, valuation, or investment advice.