Authorized Return on Equity: Utility ROE, Rate Cases, and Earnings

Authorized return on equity (authorized ROE) is the equity return percentage a regulator approves for use in setting a regulated utility's rates.

It is a ratemaking input, not a promise that shareholders will actually earn that return.

Simplified relationship

A simplified utility earnings framework is:

1Equity Earnings Opportunity ≈ Rate Base × Authorized Equity Ratio × Authorized ROE

For example, if a regulator recognizes $10 billion of Rate Base, a 50% equity layer, and a 10% authorized ROE, the simplified equity-return component would be about $500 million.

That is not a GAAP net-income forecast.

Authorized ROE versus actual earned ROE

The authorized percentage is used to set rates under regulatory assumptions. Actual earned ROE can be above or below that level because real results differ from those assumptions.

Drivers include:

• operating and maintenance costs;
• financing costs;
• customer usage or sales where revenues remain volume-sensitive;
• weather;
• taxes;
• capital placed in service;
• timing of rate recovery;
• incentive or penalty mechanisms; and
• regulatory disallowances.

An authorized 10% ROE therefore does not mean the utility will report a 10% accounting ROE or deliver a 10% shareholder return.

Capital structure matters too

Authorized ROE applies to the equity portion of the regulator-approved capital structure, not automatically to the utility's entire rate base.

Two utilities with the same rate base and authorized ROE can have different revenue requirements if their approved equity ratios differ.

Investors should preserve both:

1Authorized ROE
2Authorized Equity Ratio / Equity Layer

rather than comparing ROE percentages alone.

Why commissions set an ROE

Regulators generally attempt to balance customer affordability with a utility's ability to attract capital and maintain reliable service.

The approved ROE can change in rate cases as commissions consider market interest rates, utility risk, peer evidence, capital needs, and other record-specific factors.

Entergy's 2025 Form 10-K, for example, reports different authorized common-equity return ranges across its Arkansas, Louisiana, Mississippi, New Orleans, and Texas utilities.

Authorized ROE is jurisdiction-specific

A utility holding company can have several authorized ROEs at once because different subsidiaries operate under different state commissions or FERC jurisdiction.

Even within one utility, transmission and distribution operations may have different authorized returns and capital structures.

Pinnacle West's 2025 filed materials, for example, show separate Arizona Corporation Commission and FERC allowed ROEs for APS-related rate bases.

ROE changes do not operate in isolation

A lower authorized ROE can be offset by faster Rate Base growth, a higher equity layer, reduced Regulatory Lag, or improved cost recovery.

Conversely, a higher authorized ROE does not guarantee better economics if capital growth is weak, costs outrun rates, or the utility persistently under-earns.

Investors should therefore analyze the complete regulatory settlement rather than ranking utilities by authorized ROE alone.

Real-world filing context

Entergy's 2025 Form 10-K reports authorized returns on common equity ranging by operating company and jurisdiction. Black Hills' 2025 Form 10-K similarly reports authorized ROE, authorized return on rate base, capital structure, and rate base by utility jurisdiction.

Sources:

• Entergy 2025 Form 10-K
• Black Hills 2025 Form 10-K
• Pinnacle West 2025 earnings materials filed with the SEC

Bottom line

Authorized ROE is the regulator-approved equity return used in utility ratemaking. It must be interpreted together with rate base, the authorized equity layer, recovery timing, and actual operating performance. It is not the same as accounting ROE, a guaranteed earned return, or an investor's expected stock return.

Explore more topics in the Financial Research Encyclopedia.