Southwest Gas (SWX) Q4 2025 earnings review
Pure-Play Pivot Complete; Data Center Demand Supercharges Growth
Southwest Gas has successfully completed its grueling multi-year transition into a pure-play regulated natural gas utility. By deconsolidating Centuri and injecting $1.35B of proceeds to crush holding company debt, SWX earned a BBB+ upgrade and delivered a clean 8.3% adjusted ROE. However, the real story is the staggering forward guidance. Driven by the $1.7B Great Basin pipeline expansion to feed power-hungry data centers in Nevada, management is projecting an accelerating 12-14% EPS CAGR through 2030. While falling system throughput volumes warrant caution, the combination of a fixed balance sheet, formula ratemaking requests, and massive infrastructure deployment makes this a highly compelling infrastructure growth story.
🐂 Bull Case
The long-term rate base CAGR guidance just jumped from a stable 6-8% to an accelerating 9.5-11.5%. The $6.3B 5-year CapEx plan provides immense, visible runway for earnings growth.
The Centuri separation yielded $1.35B in net proceeds, wiping out the $550M term loan and revolver debt. The S&P upgrade to BBB+ validates the deleveraging and lowers future cost of capital.
🐻 Bear Case
Despite adding 37,000 new meter sets in 2025, total system throughput fell 6.7%. If decoupling mechanisms shield margins now, structurally lower volumes will eventually pressure customer bills.
SWX's ability to achieve its 12-14% EPS CAGR depends heavily on upcoming rate cases in Arizona and Nevada. If regulators reject the shift to formula ratemaking, earnings will remain subjected to punitive regulatory lag.
⚖️ Verdict: 🟢
Bullish. The messy Centuri overhang is finally gone. SWX is now a pure-play utility sitting on one of the most explosive, AI-driven infrastructure growth catalysts (Great Basin) in the sector.
Key Themes
Great Basin Expansion: The Supercomputing Catalyst
The macro and technological landscape for SWX has radically shifted. Fueled by explosive demand from supercomputing and data centers in northern Nevada, the Great Basin Gas Transmission Company expansion received FERC pre-filing approval in January. This $1.7B incremental capital opportunity transitions SWX from a standard sunbelt utility into a premier AI-adjacent infrastructure play, driving an accelerating 12-14% EPS CAGR.
Pure-Play Transformation Achieved
Management executed flawlessly on the Centuri deconsolidation. The $1.35B in net proceeds allowed SWX to completely extinguish its $550M term loan and revolving credit facility balances. This singular focus on the core utility business resulted in an immediate credit profile improvement, with S&P upgrading SWX to BBB+. Interest expense at the corporate level is sharply decelerating, unlocking bottom-line growth.
Aggressive Push for Formula Ratemaking
To combat the historically nonlinear and lumpy earnings profile, management is taking an aggressive regulatory posture. SWX is filing rate cases in Arizona and Nevada explicitly requesting formula ratemaking. If approved, this will drastically reduce regulatory lag and ensure that the massive incoming capital deployments generate immediate, predictable returns.
Throughput Reversing Contradicts Customer Growth Narrative
Management heavily promoted a 1.6% customer growth rate (37,000 new meters added in 2025) driven by strong sunbelt macro migration. However, the underlying data reveals a red flag: total system throughput is actively decelerating. Volumes dropped from 219.4M dekatherms in 2024 to 204.7M in 2025 (-6.7%). Residential fell 6%, Transportation dropped 9.7%, and Industrial plunged 6.1%. While decoupling mechanisms protect current margins, laying billions in new pipe for a shrinking volume base will inevitably drive up per-unit customer bills, risking severe regulatory pushback.
O&M Expenses Accelerating
While revenues declined, operations and maintenance (O&M) expenses climbed by $16.8M in 2025. Management specifically cited a $5.8M hit from incentive compensation, $4.8M in higher outside services, and $4.4M in escalating cloud-computing costs. SWX previously targeted flat O&M per customer; this upward cost trajectory needs reversing before it eats into the robust gross margin expansions won in recent rate cases.
Property Tax Drag
Taxes other than income taxes rose by $5.1M in 2025, driven almost entirely by property tax increases across all jurisdictions. As SWX accelerates its capital deployment program to $1.25B in 2026, the expanding asset base will trigger compounding property tax liabilities. This creates a mechanical headwind to operating leverage that must be consistently recovered in future rate cases.
Other KPIs
Accelerating. Up from $1.33 billion in 2024. This $119.6M increase was cleanly driven by $95.2M in incremental rate relief across Arizona and other territories, proving that recent regulatory settlements are effectively flowing through to the top line regardless of the drop in underlying gas commodity costs.
Stable and highly robust. Comfortably exceeding management's prior >14% target. This metric was the key driver behind the S&P upgrade to BBB+ and ensures SWX has the balance sheet elasticity to fund the massive $6.3B upcoming capital program without dilutive equity issuances.
Reversing completely. Up from a $22.2M loss in 2024. This reflects the final $343.1M deconsolidation and remeasurement gain from the Centuri separation, offset by associated taxes. This line item will disappear in 2026, leaving a clean, recurring utility earnings stream.
Guidance
Accelerating. The midpoint of $4.245 represents a massive 16.3% YoY jump over 2025's $3.65. This proves the pure-play thesis: shedding Centuri debt and securing rate relief immediately drops to the bottom line.
Accelerating dramatically. Up 46% from the $855M spent in 2025. This step-up marks the beginning of the Great Basin deployment and signals a permanently higher run-rate for infrastructure investment.
Accelerating. A massive structural upgrade from the prior 6.0-8.0% guidance for 2025-2029. Using a $6.7B base, SWX is signaling it will nearly double its rate base over the next half-decade.
Key Questions
Throughput Deterioration vs. Bill Pressure
With total system throughput falling nearly 7% despite adding 37k meters, how much of this is weather versus structural demand destruction? As you deploy $6.3B over the next 5 years into a shrinking volume base, how will you manage the inevitable rate shock to the average residential customer bill?
Formula Ratemaking Contingency
You are guiding to a 12-14% EPS CAGR while simultaneously filing for formula ratemaking in AZ and NV. Are these guidance figures entirely dependent on regulators approving formula rates? What is the downside EPS CAGR if you are forced to remain under traditional, lag-heavy rate cases?
Great Basin AFUDC Timing
With the 2026 CapEx stepping up to $1.25B largely for the Great Basin project, what is the expected timeline for AFUDC accretion, and how much of the $4.17-$4.32 2026 EPS guidance relies on non-cash construction earnings?