How does utility capex translate into earnings growth?

Regulated utilities earn an authorized return on equity against the rate base, which is the approved value of capital invested in serving customers. When new capex is added to the rate base through a general rate case or a forward-looking mechanism, earnings grow in line with the equity portion of that additional capital at the authorized return. This is why rate-base growth rates and authorized returns together largely determine long-term earnings growth for regulated utilities, with capex scale being the main driver of rate-base growth.

Why does utility capex typically exceed operating cash flow?

Large capex programs in grid modernization, transmission, and renewable generation often exceed the cash flow the business generates in a given year, which is why utilities issue debt and equity to fund the gap. This is a structural feature of the business model rather than a sign of stress: regulators allow utilities to earn a return on the full rate base including debt-financed capital, and the debt capacity is supported by stable regulated cash flows. Free cash flow after capex is therefore often negative for growing utilities, though earnings continue expanding.

What risks can undermine the expected returns on utility capex?

Regulators can disallow portions of requested investment if they determine spending was imprudent or outside approved plans, creating stranded costs that earn nothing. Permitting delays can push projects beyond planned in-service dates, deferring the earnings they were designed to produce. Technology shifts, particularly in generation, can leave older assets uneconomic before fully depreciated. The quality of each state regulatory commission and the alignment between capex plans and regulatory direction materially affect whether planned returns actually materialize in reported earnings.

Biggest CapEx Utilities Stocks

Top utilities companies ranked by capital expenditures, latest annual filings.

What Capital Expenditures Mean for Utilities Companies

Capital expenditures sit at the heart of the utilities business model. Approved capex goes into the rate base, and the utility earns its authorized return on that invested capital, which means every dollar of approved investment is designed to earn a regulated return over its depreciable life. Capex is therefore the primary engine of earnings growth in the sector rather than a drain on cash available to shareholders.

Why Capital Expenditures Matter

Investments in grid modernization, renewable generation, transmission, and hardening against extreme weather expand the rate base and, assuming timely regulatory recovery, grow earnings. Still, capital projects disallowed by regulators, delayed by permitting, or stranded by technology shifts can tie up investment without producing the authorized returns they were planned to earn. The regulatory environment quality of each jurisdiction shapes whether capex translates cleanly into future profit.

What to Read Alongside

Pair capex with [Free Cash Flow](/financials/top-free-cash-flow-stocks/utilities/) to see cash after heavy investment, [Net Income](/financials/top-net-income-stocks/utilities/) for the profit the rate base supports, and [Long-term Debt](/financials/most-indebted-stocks/utilities/) because large utility capex programs are substantially debt-financed.

Data as of FY 2025 64 companies Rhea AI

#	Symbol	Company	Sector
1	DUK	Duke Energy Corporation	Utilities	$14.02B	$96.82B
2	SO	The Southern Company	Utilities	$12.74B	$105.14B
3	PCG	PG&E Corporation	Utilities	$11.79B	$36.98B
4	XEL	Xcel Energy Inc.	Utilities	$10.91B	$48.86B
5	SRE	Sempra	Utilities	$10.61B	$59.84B
6	EXC	Exelon Corporation	Utilities	$8.53B	$46.57B
7	ETR	Entergy Corporation	Utilities	$7.68B	$50.32B
8	BEP	Brookfield Renewable Partners L.P.	Utilities	$6.59B	$10.73B
9	EIX	Edison International	Utilities	$6.51B	$27.84B
10	BIP	Brookfield Infrastructure Partners L.P.	Utilities	$6.02B	$17.65B
11	AES	The AES Corporation	Utilities	$5.93B	$10.46B
12	CNP	CenterPoint Energy, Inc.	Utilities	$4.87B	$27.83B
13	FE	FirstEnergy Corp.	Utilities	$4.71B	$27.00B
14	ES	Eversource Energy	Utilities	$4.16B	$25.74B
15	AEE	Ameren Corporation	Utilities	$4.13B	$29.96B
16	PPL	PPL Corporation	Utilities	$4.03B	$26.68B
17	ATO	Atmos Energy Corporation	Utilities	$3.56B	$28.08B
18	AEP	American Electric Power Company, Inc.	Utilities	$3.45B	$69.91B
19	PEG	Public Service Enterprise Group Incorporated	Utilities	$3.27B	$39.26B
20	AWK	American Water Works Company, Inc.	Utilities	$3.13B	$24.30B
21	WTRG	Essential Utilities, Inc.	Utilities	$3.13B	$10.53B
22	CEG	Constellation Energy Corporation	Utilities	$2.95B	$88.10B
23	EVRG	Evergy, Inc.	Utilities	$2.80B	$19.09B
24	NI	NiSource Inc.	Utilities	$2.78B	$22.35B
25	VST	Vistra Corp.	Utilities	$2.75B	$49.36B
26	PNW	Pinnacle West Capital Corporation	Utilities	$2.62B	$12.41B
27	ENLT	Enlight Renewable Energy Ltd	Utilities	$1.81B	$13.16B
28	BIPC	Brookfield Infrastructure Corporation	Utilities	$1.61B	$4.98B
29	TXNM	TXNM Energy, Inc.	Utilities	$1.20B	$6.33B
30	POR	Portland General Electric Company	Utilities	$1.19B	$5.79B
31	IDA	IDACORP, Inc.	Utilities	$1.18B	$7.84B
32	NRG	NRG Energy, Inc.	Utilities	$1.15B	$26.10B
33	BEPC	Brookfield Renewable Corporation	Utilities	$1.14B	$6.87B
34	OGE	OGE Energy Corp.	Utilities	$1.05B	$9.77B
35	XIFR	XPLR Infrastructure, LP	Utilities	$0.96B	$1.09B
36	SR	Spire Inc.	Utilities	$0.92B	$4.60B
37	UGI	UGI Corporation	Utilities	$0.84B	$7.45B
38	BKH	Black Hills Corporation	Utilities	$0.82B	$5.46B
39	SWX	Southwest Gas Holdings, Inc.	Utilities	$0.81B	$6.37B
40	AQN	Algonquin Power & Utilities Corp.	Utilities	$0.77B	$4.53B
41	MDU	MDU Resources Group, Inc.	Utilities	$0.77B	$4.37B
42	OGS	ONE Gas, Inc.	Utilities	$0.71B	$4.78B
43	ORA	Ormat Technologies, Inc.	Utilities	$0.62B	$8.38B
44	AVA	Avista Corporation	Utilities	$0.57B	$3.47B
45	NWE	NorthWestern Energy Group, Inc.	Utilities	$0.52B	$4.27B
46	NWN	Northwest Natural Holding Company	Utilities	$0.47B	$2.07B
47	ENIC	Enel Chile S.A.	Utilities	$0.46B	$6.10B
48	CPK	Chesapeake Utilities Corporation	Utilities	$0.45B	$2.94B
49	ALE	ALLETE, Inc.	Utilities	$0.35B	$3.94B
50	MGEE	MGE Energy, Inc.	Utilities	$0.34B	$2.90B
51	HE	Hawaiian Electric Industries, Inc.	Utilities	$0.34B	$2.27B
52	CWEN	Clearway Energy, Inc.	Utilities	$0.32B	$5.87B
53	AWR	American States Water Company	Utilities	$0.24B	$3.01B
54	UTL	Unitil Corporation	Utilities	$0.19B	$0.92B
55	KEN	Kenon Holdings Ltd.	Utilities	$0.12B	$3.76B
56	TLN	Talen Energy Corporation	Utilities	$0.10B	$15.65B
57	CTRI	Centuri Holdings, Inc.	Utilities	$0.09B	$3.00B
58	SPH	Suburban Propane Partners, L.P.	Utilities	$0.07B	$1.26B
59	HNRG	Hallador Energy Company	Utilities	$0.07B	$0.76B
60	NRGV	Energy Vault Holdings, Inc.	Utilities	$0.04B	$0.79B
61	OKLO	Oklo Inc.	Utilities	$0.03B	$10.07B
62	DGXX	Digi Power X Inc.	Utilities	$0.02B	$0.59B
63	FLNC	Fluence Energy, Inc.	Utilities	$0.01B	$3.22B
64	IMSR	Terrestrial Energy Inc.	Utilities	$0.00B	$0.77B

How this ranking is built

Companies are ranked by capital expenditures as reported in their most recent annual filing with the SEC. Figures shown are in US dollars (or percent, as noted), rounded to two decimals.

Source: annual 10-K / 20-F filings from companies trading on US exchanges (NYSE, Nasdaq, AMEX).
Fiscal year: whichever annual period the company has most recently filed. Fiscal years don't always align with the calendar year, so the "as of FY" stamp above reflects the most common year across the table.
Filtered out: warrants, preferred shares, and duplicate listings that share a parent company's financials.
Update cadence: refreshed as companies file new annual reports (typically within 60–90 days of fiscal year end).

Not financial advice. This is a research tool, not a recommendation.