Pinnacle West Capital (PNW)

Utilities — Electricidad regulada

Pinnacle West is the holding company of Arizona Public Service (APS), Arizona's largest regulated electric utility, with an exclusive territorial franchise over 1.4 million customers and a capex plan of US$2.6-2.7 billion annually (2026-2028) driven by the state's population growth and the arrival of data centers. The 2026 EPS guidance (US$4.55-4.75, weather-normalized) implies a compression of nearly 8% versus TTM from higher interest, higher depreciation and the dilution from the at-the-market equity issuance financing that capex, before the next rate case recovers the regulatory lag. With the current price already reflecting much of the structural growth story (data centers, population) and a return on capital just below the 10% bar, the projected 5-year total return in the base case is +3%: Preserves value.

Moat Compounder estimates the intrinsic value of Pinnacle West Capital (PNW) at $91 per share on a five-year horizon. With the stock at $97.52 at 2026-09-04 close, the expected total return is 2.7% per year: preserves value. The analysis draws on 10-K FY2025 and 8-K (Q2 2026 results). Analysis dated 2026-08-04.

Price
$97.52
at 2026-09-04 close
Intrinsic value (5y, base)
$91
Total annual return (5y)
2.7%
-1.3% price · 4.1% div
Status (nominal)
Preserves value
Margin of safety
No margin

The essentials

  • Single reportable segment: regulated electricity through APS, with an exclusive territorial franchise in 11 of Arizona's 15 counties
  • 2026 weather-normalized EPS guidance of US$4.55-4.75 (midpoint US$4.65), ~8% below the actual TTM on higher interest, depreciation and dilution
  • Regulated capex plan of US$2.6/2.65/2.7 billion for 2026-2028, financed with debt and continuous equity issuance (ATM)
  • Data centers and advanced manufacturing add 3-5 percentage points to 2026 sales growth
Source 10-K FY2025 Dec 31, 2025 ·8-K (Q2 2026 results) Aug 4, 2026 ·DEF 14A 2026 (proxy) Apr 3, 2026
Health: Solid
Price $98 at 2026-09-04 closeMarket Cap $12.1 bnEnterprise Value $22.7 bnNet debt $10.5 bnP/E (today) 19.0x

Intrinsic value — two valuation methods

No margin of safety
Price market
$98
DCF value today
$137
+40.4% vs price
Multiples value today
$90
-7.6% vs price

Total return at 5 years: 2.7%/year = -1.3% appreciation + 4.1% dividend. The target price ($91) is ex-dividend; the $19 in dividends collected over 5 years are added separately.

The methods disagree: one places the value today above the price ($98) and the other below.

Pillars of the analysis

The verdict — today vs 5 years

Today — expensive, no margin of safety: at $98 trades ~8.2% above its value discounted to today (~$90); the expected return does not even reach the risk-free rate (4.5%).

At 5 years — Preserva valor: the target price ($91) plus dividends yield just enough to preserve nominal capital, below the required 4% floor.

The bridge: the return at 5 years falls below the risk-free rate (4.5%) — which is why there is not even a discount to today's value. To require a 15% annual return, it would need to be bought at ~$58.

Thesis

The business

Pinnacle West is the holding company of Arizona Public Service (APS), Arizona's largest regulated electric utility, with an exclusive territorial franchise over 1.4 million customers and nearly 140 years of accumulated generation, transmission and distribution infrastructure. The return on capital is set by the Arizona Corporation Commission at 9.55%, and the business is in a heavy-investment phase: a capex plan of US$2.6-2.7 billion annually between 2026 and 2028 to capture Arizona's population growth and the arrival of data centers and advanced manufacturing, which the company itself projects will add between 3 and 5 percentage points of additional sales growth in 2026.

The valuation

It is valued by P/E on net income attributable to common shareholders, the correct metric for a regulated utility at the equity level: APS's debt is operating funding for the regulated business, already reflected in the return authorized by the ACC, and subtracting it again in an enterprise-value-to-equity bridge would double-count leverage. The base case's exit multiple is 16 times year-5 earnings, in the lower half of the regulated-utilities band (15-18 times), yielding a 5-year value of $91 per share.

The margin of safety

Against the market price of $98, the projected 5-year total return in the base case is +3%: Preserves value. No margin of safety: at this price capital is preserved, but it is not bought below its value. The starting point (2026 weather-normalized EPS guidance of US$4.55-4.75) implies a compression of nearly 8% versus actual TTM earnings from higher interest charges, higher depreciation and the dilution from the continuous equity issuance financing the capex plan, before the next rate case recovers the regulatory lag.

What to watch

The central disconfirmer of the thesis is the speed of the regulatory lag: if the next rate case before the ACC is delayed or resolved with a lower authorized return, the earned ROE would remain below the authorized 9.55% beyond what the base case models, and the share dilution financing capex would keep compressing earnings per share without the offset of timely rate recognition. The second risk to monitor is whether data center and advanced manufacturing demand materializes as projected: if it does not, part of the capital investment already committed would be left without the load that would justify it.

Educational / informational. Does not constitute investment advice.

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