[PWR] Quanta Services: Q3 2026 earnings preview, Electric margin in peak season

Quanta Services, one of the largest specialty contractors building and maintaining the US power grid, designs, builds and services infrastructure for electric utilities, power generation and storage developers, data centers and other large-load facilities, and gas utilities. Its Quanta Services Q3 2026 earnings call is scheduled for 2026-10-29 and will cover the third quarter of 2026, ending September 30, 2026[1]. In the latest disclosed period, the second quarter of 2026, revenue rose 41.1% to $9.56 billion from $6.77 billion a year earlier, net income attributable to common stock was $451.4 million, and adjusted diluted EPS was $4.24 versus $2.48[2]; organic revenue growth was 27.4% and adjusted EBITDA rose 59.5% to $1.07 billion[3], while total backlog reached a record $53.4 billion at June 30[4]. On July 30 management raised full-year 2026 guidance to revenue of $39.3 billion to $39.7 billion, adjusted EBITDA of $4.09 billion to $4.21 billion, adjusted diluted EPS of $16.45 to $16.95 and free cash flow of $2.00 billion to $2.50 billion[5]; subtracting first-half revenue of $17.43 billion and adjusted EPS of $6.92 leaves roughly $21.87 billion to $22.27 billion of revenue and $9.53 to $10.03 of adjusted EPS for the second half[3]. The average of 15 analysts compiled by Drillr calls for third-quarter revenue of $10.92 billion and EPS of $4.95[6], and the average full-year revenue estimate of $39.56 billion sits inside the company's range[6].

Three things matter most in this report. First, can the Electric Infrastructure Solutions segment (Electric) keep organic growth above 25% in peak construction season while holding its segment margin at the 11.4% the company posted in the third quarter of last year? In the second quarter the segment grew revenue 43.6% with an 11.5% margin[7] and roughly 33% organic growth[8], and the third quarter will show whether that margin gain reflects better execution or seasonal and project timing. Second, can newly acquired mechanical and civil businesses lift Underground and Infrastructure revenue to about $2.2 billion while keeping the margin near 9%? The segment earned a 9.1% margin in the second quarter but grew only about 4% organically[9], and the third quarter is the first peak season to test this acquisition-driven change in mix. Third, can collections keep pace as revenue keeps growing? Second-quarter free cash flow was $886 million[10] and days sales outstanding (DSO) fell to 57 days at June 30[11], but summer and fall are the seasons of heaviest working capital use, so September operating cash flow and DSO will either confirm or weaken that improvement.

Company Background and Business Structure

Quanta Services is a specialty engineering and construction group that grows through steady acquisitions and is made up of many largely autonomous operating subsidiaries. Founded in 1997 and headquartered in Houston, it is listed on the New York Stock Exchange; its 2024 acquisition of Cupertino Electric (CEI) took it into critical-path electrical design and installation for data centers and other large-load facilities[12]. From the second quarter through July 2026 it completed four more acquisitions for about $1.24 billion of upfront consideration plus up to about $242.3 million of performance-based contingent consideration[13], adding roughly 7,400 employees[14]. At the end of 2025 the company had about 69,500 employees, including about 55,700 hourly workers, and about 36% of employees were covered by collective bargaining agreements[15]. Quanta also holds equity interests such as a 50% stake in LUMA Energy, which operates Puerto Rico's transmission and distribution network; these interests are accounted for under the equity method and contributed $55.6 million of earnings in 2025, far smaller than the two segments[16].

The company reports two segments, and Electric accounts for more than 80% of revenue. In 2025 Electric generated $23.00 billion of revenue, 80.8% of the total, with a 10.3% segment operating margin, while Underground and Infrastructure generated $5.48 billion, 19.2% of the total, with a 7.3% margin[17]. Electric builds, upgrades, maintains and repairs transmission, substation and distribution systems for utilities, engineers and interconnects solar, wind and storage facilities, supplies electrical systems for data centers and advanced manufacturing, and manufactures power transformers; Underground and Infrastructure serves customers that transport, distribute, store and process natural gas, oil and other products[18]. On the company's supplemental basis, electric grid and gas utility work made up about 50% of 2025 revenue, power generation and storage about 25%, technology and load centers about 10%, and communications, industrial and pipeline services about 5% each[19].

Contract structure and customer mix determine how much execution risk Quanta carries. In 2025 fixed price contracts made up 60.6% of revenue, unit-price contracts 23.8% and cost-plus contracts 15.6%[20]; by the second quarter of 2026 the fixed price share had risen to 63.7%[21]. Much recurring work runs through multi-year master service agreements (MSAs), with transaction prices set per unit, as cost plus margin, or as a lump sum[22]. Customer concentration is modest: the largest customer accounted for 8% of 2025 revenue and the top ten for 30%[23]. Segment profit includes allocated overhead, while amortization of acquired intangibles, stock-based compensation and acquisition and integration costs stay at the corporate level[24]; these corporate and non-allocated costs were $1.15 billion in 2025, or 4.0% of revenue[17].

Financial History and Current Position

The annual record shows sustained double-digit revenue growth without an expansion in consolidated operating margin. Revenue rose from $20.88 billion in 2023 to $23.67 billion in 2024 and $28.48 billion in 2025[20]; in 2025 revenue grew 20.3%, gross profit was $4.28 billion for a 15.0% gross margin, operating income was $1.61 billion for a 5.7% operating margin, flat with 2024, and net income attributable to common stock rose 13.7% to $1.03 billion[16]. Operating cash flow in 2025 was $2.23 billion, capital expenditures were $609.2 million, cash spent on acquisitions was $3.05 billion, and year-end DSO was 60 days[25]; total long-term debt was $5.99 billion at year-end[26] and total backlog was $43.98 billion[4].

In the first two quarters of 2026, growth and margins accelerated together. First-quarter revenue was $7.87 billion versus $6.23 billion a year earlier, adjusted diluted EPS was $2.68 and backlog was $48.5 billion[27], after which the company raised full-year revenue guidance to $34.7 billion to $35.2 billion[28]. Second-quarter revenue rose 41.1% to $9.56 billion, gross profit was $1.55 billion for a 16.2% gross margin versus 14.9% a year earlier, and operating income was $694.8 million for a 7.3% operating margin versus 5.5%[29]; diluted EPS was $2.96[2]. By segment, Electric revenue rose 43.6% to $7.84 billion with an 11.5% margin, and Underground and Infrastructure revenue rose 30.7% to $1.72 billion with a 9.1% margin[7].

Cash flow and the balance sheet improved markedly in the second quarter, even as the company accelerated acquisitions and financing. Second-quarter operating cash flow was $1.10 billion versus $295.7 million a year earlier, free cash flow was $886 million, and first-half free cash flow totaled $1.07 billion[10]; DSO was 57 days at June 30, below 62 days a year earlier and the five-year average of 71 days[11]. Long-term debt was $6.10 billion at June 30[26], debt-to-EBITDA under the senior credit agreement fell from 1.95x at the end of 2025 to 1.72x[13], and available credit commitments plus cash totaled about $2.77 billion[30]. At the same date, total backlog was $53.4 billion, of which $32.3 billion is expected within 12 months, and remaining performance obligations (RPO) were $33.6 billion[4]. The board authorized a $1.0 billion stock repurchase program in May[31], and in August the company priced $2.0 billion of senior notes to repay commercial paper and credit facility borrowings[32].

Operating Model

Revenue is driven by backlog conversion, short-cycle work and acquisitions. Consolidated revenue is the sum of Electric and Underground and Infrastructure revenue: opening backlog converts to revenue as construction progresses, MSA and short-cycle work is recognized as customers spend each quarter, and acquired companies contribute from their closing dates; fixed price contracts recognize revenue by percentage of completion, unit-price contracts by units completed and cost-plus contracts by costs incurred plus margin[22]. Of the 41.1% second-quarter revenue growth, organic growth accounted for 27.4 percentage points[3], while acquired businesses contributed about $575 million of Electric revenue and about $355 million of Underground and Infrastructure revenue[33][34]. Backlog grew partly through acquisitions and partly through new awards and higher volumes with existing customers[35], so changes in demand usually show up first in backlog and then convert to revenue over the following quarters.

Margins depend mainly on crew utilization, project execution and cost estimates on fixed price contracts, and are then diluted by corporate costs. Segment operating income equals segment revenue minus segment operating expenses, which include labor, subcontractors, materials, equipment and allocated overhead[24]; consolidated operating income then deducts corporate overhead, stock-based compensation, acquisition and integration costs, amortization of acquired intangibles and changes in the fair value of contingent consideration. In 2025 the two segments earned margins of 10.3% and 7.3%, corporate and non-allocated costs took 4.0% of revenue, and the consolidated operating margin was therefore only 5.7%[17]; in the second quarter of 2026 corporate costs fell to 3.8% of revenue and the consolidated operating margin rose to 7.3%[7]. Amortization of acquired intangibles reached $157.0 million in the second quarter alone[29], which means the gap between GAAP profit and segment profit widens with every acquisition.

Cash flow lags profit and is strongly seasonal. Operating cash flow equals net income plus depreciation, amortization and stock-based compensation, less increases in receivables, contract assets and inventories, plus increases in payables and contract liabilities; the company says working capital needs are higher in the summer and fall construction season and convert to cash in winter, and that unapproved change orders and claims also tie up cash until they are collected[30]. In the first half, receivables rose $1.13 billion, payables rose $884.0 million and contract liabilities rose $700.2 million[36], indicating that a large part of the strong second-quarter cash flow came from customer prepayments and payment timing. Free cash flow is operating cash flow minus net capital expenditures, and first-half capital expenditures were $451.0 million[10]; acquisition spending not covered by free cash flow, $930.3 million in the first half[37], was funded with cash, commercial paper and bonds[32].

Industry and Competitive Position

Demand comes from utilities expanding transmission, substation, interconnection and generation investment to meet rising electricity use. In its annual report the company attributes that load growth to data centers and other technology infrastructure, manufacturing reshoring and broad electrification, and it also cites grid hardening and undergrounding programs driven by recurring severe weather[38]. In its 2026 outlook, the company sees technology and load center revenue growing 220% to 240%, mainly because Dynamic Systems and Tri-City contribute for a full year, electric grid and gas utility revenue growing 20% to 25%, power generation and storage 10% to 15%, and pipeline services 0% to 5%[19]. Management said on the call that data centers have grown to 15% to 20% of the business over the past two years[39].

Quanta competes with specialty contractors such as MasTec, MYR Group, Primoris and Pike, as well as utilities' in-house crews, and its main advantage is a large self-performing craft workforce. Management says Quanta self-performs 80% to 85% of its work and invests about $250 million a year in craft training[40], trains about 15,000 new craft workers annually, and now sees customers reserving its capacity alongside five- to seven-year capital budgets[41]. The cost of this model is labor intensity, and management itself named craft labor capacity as the bottleneck for new generation and data center interconnection projects[42]; as the fixed price share rises, more execution risk also shifts onto the company[21]. Because the available material covers only Quanta's own disclosures, its margins and backlog cannot be compared quantitatively with competitors over the same period.

Core Debates

The third quarter is Electric's peak construction season, and its margin was already 11.4% a year earlier. Can the segment keep organic growth above 25% while holding its margin at last year's level?

This question decides whether full-year profit is delivered, because Electric accounts for more than 80% of Quanta's revenue and is the company's main vehicle for grid upgrades, generation and data center construction. In the second quarter Electric revenue grew 43.6% and its margin rose to 11.5%[7], after which the company raised full-year Electric revenue guidance by $3.45 billion at the midpoint to $31.7 billion to $31.9 billion, with margin guidance of 10.5% to 10.75%[43]. The comparison base is high, however: the company's Electric margin in the third quarter of last year was 11.4%, well above the 10.1% of the prior-year second quarter, so the year-over-year comparison in the third quarter does a better job of separating execution gains from seasonal and project timing effects.

Most evidence points to continued conversion of demand, but there are counter-signals on whether the margin can hold. Electric grew about 33% organically in the second quarter, businesses acquired over the past 12 months contributed about $575 million of revenue, and the company attributed the margin to increased scope, self-performed work, efficient resource utilization and solid execution[8]; Electric's 12-month backlog was $26.68 billion at June 30 versus $17.18 billion a year earlier, up about 55%[4]. The company also said that a significant majority of its power generation and grid program with NiSource is not yet in backlog and is expected to be booked over multiple quarters beginning in the second half of 2026 as permits and approvals are obtained[44]. On the other side, the full-year margin guidance of 10.5% to 10.75% implies roughly 10.7% to 11.2% for the second half, below the second quarter's 11.5%[43]; fixed price contracts rose to 63.7% of revenue[21]; and management named craft labor capacity as the bottleneck for generation and data center projects[42].

The numerical baselines and the transmission chain work as follows. Electric revenue was $7.84 billion in the second quarter and $14.31 billion in the first half, up 37.5%; second-quarter segment operating income was $898.2 million for an 11.5% margin versus 10.1% a year earlier, and the first-half margin was 10.2% versus 9.2%[7]; the full-year 2025 margin was 10.3%[17], and acquisitions contributed about $1.04 billion of first-half revenue[45]. Utilities' transmission and interconnection programs, generation construction and data center work determine how many of Quanta's own crews are deployed and for how long, which drives Electric revenue; the self-perform share, resource utilization and cost estimates on fixed price projects set the segment margin, which flows through to consolidated operating income and adjusted EBITDA. Large new awards enter backlog first and are recognized as work progresses, so backlog changes lead revenue.

What remains unresolved is whether the second quarter's high margin can be repeated in peak season. The alternative explanation is that the second-quarter margin benefited from favorable project closeouts or weather, while large projects starting in peak season earn lower early margins; if third-quarter revenue meets plan but the margin falls back below 11%, that explanation gains weight. Watch whether Electric revenue reaches about $8.5 billion with organic growth above 25%, how the margin compares with last year's 11.4%, whether Electric's 12-month backlog at September 30 stays above $26.68 billion, and whether the NiSource program and large transmission projects begin to be booked. Third-quarter Electric revenue below $8.3 billion, organic growth below 20%, or a segment margin below 10.5% would weaken the current reading of demand conversion and improved execution.

Guidance implies the Underground and Infrastructure segment grows by nearly 60% in the second half, yet its second-quarter organic growth was only 4%. Can acquired mechanical and civil businesses lift third-quarter revenue to about $2.2 billion while keeping the margin near 9%?

This segment is shifting from a low-margin gas and pipeline service provider into a business that also builds mechanical and process systems for large-load facilities, and the third quarter is the first peak season to test that shift. Historically it served mainly gas utilities and pipeline customers and earned a 7.3% margin in 2025[17]; after acquiring Dynamic Systems[19] and, in July, Enerfab[9], it extended into mechanical and process systems for data centers, semiconductor plants and similar facilities. The company raised full-year segment revenue guidance by $1.10 billion at the midpoint to $7.6 billion to $7.8 billion and said businesses acquired after the first quarter should contribute about $400 million of 2026 revenue[43]; subtracting first-half revenue of $3.13 billion[7] leaves about $4.47 billion to $4.67 billion for the second half, nearly 60% above the roughly $2.87 billion of the prior-year second half[17].

Evidence of structural improvement centers on margin and backlog, while evidence against it centers on organic growth. The second-quarter segment margin was 9.1% versus 6.9% a year earlier[7], which the company attributed mainly to its civil and mechanical operations, and segment backlog reached a record $9.7 billion, driven by bookings in mechanical operations and Canadian pipeline operations[9]; full-year margin guidance was raised to 8.75% to 9.0%[43]. But organic growth was only about 4% in the second quarter, with businesses acquired over the past 12 months contributing about $355 million of revenue[9], roughly 88% of the revenue increase[7]; the company's own outlook for 2026 pipeline services growth is just 0% to 5%[19].

The baselines and transmission chain show that the margin gain depends mainly on a change in mix. Second-quarter segment revenue rose 30.7% to $1.72 billion and first-half revenue rose 20.0% to $3.13 billion; the second-quarter margin was 9.1% and the first-half margin 8.4% versus 6.4% a year earlier[7]. The 10-Q attributes the second-quarter margin increase to higher revenue from acquired civil and mechanical businesses, which improved fixed cost absorption[34]. The acquired mechanical and civil companies take on mechanical and process system work for data centers, semiconductor plants and other large-load facilities; once consolidated, that revenue spreads fixed costs and lifts the segment margin, while the legacy gas utility and pipeline work provides steady but slow-growing base volume and large pipeline project revenue moves with the cycle.

What is not yet resolved is whether the margin gain is a mix effect from new businesses or whether the legacy gas and pipeline operations are also improving. If third-quarter revenue meets plan but organic growth turns negative and the margin falls below the 8.4% the company reported in the third quarter of last year, the pure mix explanation gains weight. Watch whether segment revenue reaches about $2.2 billion and how much Enerfab contributes, whether organic growth stays positive, and how the margin compares with last year's 8.4% and full-year guidance of 8.75% to 9.0%. Third-quarter segment revenue below $2.1 billion, or a margin below 8.4% with negative organic growth, would weaken the current reading of structural improvement.

Second-quarter free cash flow of $886 million beat the company's own expectations. As revenue rises by roughly another $1.4 billion in the summer-fall peak season, can collections keep pace and DSO stay near 60 days?

Cash flow determines whether Quanta can keep acquiring and buying back stock without a material rise in leverage. Its profit has to pass through receivables, contract assets and customer prepayments before it becomes cash, and the company is funding a steady stream of acquisitions with cash and borrowing: the four acquisitions from the second quarter through July carried about $1.24 billion of upfront consideration[13], a new $1.0 billion buyback was authorized in May[31], and $2.0 billion of senior notes were issued in August to repay commercial paper and credit facility borrowings[32]. Second-quarter cash flow was far better than in prior years, but it included customer prepayments and the approval of a Canadian project claim, and the third quarter, as the season of heaviest working capital use, will test whether the improvement holds as the business grows[30].

Evidence for better collections comes from company commentary and guidance, while evidence against it comes from the makeup of first-half cash flow. DSO was 57 days at June 30, below 62 days a year earlier and the five-year average of 71 days[11]; the company said large-load and renewable work carried favorable working capital terms and that second-quarter free cash flow of $886 million was stronger than it had anticipated[46]; full-year free cash flow guidance was raised to $2.00 billion to $2.50 billion[5], and management said on the call that free cash flow conversion could reach 55% to 60%[42]. But first-half contract liabilities rose $700.2 million and payables rose $884.0 million[36], timing items that can reverse; unapproved change orders and claims fell from $983.6 million at the end of 2025 to $411.1 million at June 30, mainly because the customer approved the balance on a large renewable transmission project in Canada, a recovery that will not recur[47]; and the 10-Q notes that working capital needs are higher in summer and fall[30].

The baselines and transmission chain are as follows. Operating cash flow was $1.10 billion in the second quarter versus $295.7 million a year earlier and $1.49 billion in the first half versus $538.9 million; free cash flow was $886.0 million in the second quarter versus $170.4 million and $1.07 billion in the first half versus $288.2 million[10]. DSO was 60 days at the end of 2025[25], 61 days at March 31, 2026[48] and 57 days at June 30[11]. Billing milestones on large fixed price projects, MSA payment cycles, customer prepayments and claim approvals together drive changes in receivables, contract assets and contract liabilities, which in turn set DSO and operating cash flow; free cash flow after capital expenditures is the source of funds for acquisitions, buybacks and debt repayment.

What remains unresolved is whether second-quarter cash flow reflects a structural shortening of the collection cycle or one-time timing from prepayments and claim recovery. If third-quarter operating cash flow turns negative and DSO returns above 65 days, the timing explanation gains weight. Watch whether third-quarter operating cash flow is positive and close to the roughly $560 million the company reported in the third quarter of last year, whether DSO at September 30 is no higher than 60 days, how the cumulative nine-month increase in contract liabilities compares with the first half's $700.2 million, and whether unapproved change orders and claims rise again. Negative third-quarter operating cash flow or DSO above 65 days at September 30 would weaken the current reading of improved collections.

Risks and Falsifiers

The first risk is the fast pace of acquisitions and rising debt, which affects GAAP profit and the balance sheet. Acquisition spending was $3.05 billion in 2025[25] and $930.3 million in the first half of 2026[37], and the four companies bought from the second quarter through July carried about $1.24 billion of upfront consideration[13]; long-term debt was $6.10 billion at June 30[26], $2.0 billion of new notes followed in August[32], and first-half amortization of acquired intangibles of $309.3 million directly reduced GAAP operating income[36]. The company anticipates post-closing contributions from newly acquired companies of $1.2 billion to $1.4 billion of 2026 revenue and $120 million to $140 million of adjusted EBITDA[49]; if third-quarter acquisition contributions in both segments are consistent with that and no goodwill or intangible asset impairment appears, this concern does not hold.

Permitting and local policy could delay large projects and data center work, which would affect revenue visibility from 2027 onward. The company books work to backlog only after projects are approved and contracts are final, and most of the NiSource program and large transmission projects are not yet booked[44]; management also said on the call that strict local rules in places such as New York have slowed data center development there[41]. If the third-quarter report shows 12-month backlog still rising and the company says NiSource and other large projects have begun to be booked, this risk has not materialized for now.

If craft labor capacity cannot keep up as large projects stack up, early margins on newly started projects will fall. Full-year Electric revenue guidance minus first-half actuals implies about $17.4 billion to $17.6 billion of second-half Electric revenue[43][7], so every 50 basis points of segment margin lost would cut second-half segment operating income by about $87 million; management acknowledged on the call that craft capacity is the main bottleneck for new generation and data center interconnection projects[42]. If third-quarter Electric revenue is at least $8.5 billion and the segment margin is at least 11.4%, the capacity constraint has not reached profit.

A rising fixed price share amplifies the effect of cost estimate changes on margins. Fixed price contracts generated $6.08 billion of revenue in the second quarter, 63.7% of the total versus 58.3% a year earlier[21], compared with only 49.1% in 2023[20]; cost overruns on fixed price projects hit current-period profit directly and can require recognition of contract losses[22]. If the third-quarter Electric margin is at least 11.4% and the company discloses no material adverse change in contract estimates, this risk has not shown up.

Slower integration of acquisitions and slower progress on large-load mechanical projects would mainly hit the Underground and Infrastructure segment. Businesses acquired after the first quarter are expected to contribute about $400 million of 2026 revenue to the segment[43], and the four companies carried about $1.24 billion of upfront consideration plus up to about $242.3 million of contingent consideration[13]. If third-quarter segment revenue is at least $2.25 billion and the margin is at least 9.0%, integration risk has not surfaced.

Peak-season working capital needs and a reversal of customer prepayments could leave cash flow behind profit. On third-quarter revenue of about $10.9 billion, each additional day of DSO ties up about $120 million of cash; if the $700.2 million increase in contract liabilities from the first half reverses, it will directly reduce operating cash flow[36], and working capital needs are already higher in summer and fall[30]. If third-quarter operating cash flow is at least $500 million and DSO at September 30 is no higher than 60 days, this concern does not hold.

What to Watch Next

• Electric peak-season growth and margin: second-quarter revenue was $7.84 billion with an 11.5% margin and about 33% organic growth, against an 11.4% margin in last year's third quarter. Watch for revenue near $8.5 billion and organic growth above 25%; revenue below $8.3 billion, organic growth below 20% or a margin below 10.5% would weaken the case.
• Electric backlog conversion: 12-month Electric backlog was $26.68 billion at June 30. Watch whether it stays above that level and whether NiSource and large transmission projects are booked; a lower backlog with large projects still unbooked would weaken the case.
• Underground and Infrastructure acquisition step-up: second-quarter revenue was $1.72 billion with a 9.1% margin and about 4% organic growth. Watch for revenue near $2.2 billion, the Enerfab contribution and positive organic growth; revenue below $2.1 billion, or a margin below 8.4% with negative organic growth, would weaken the case.
• Peak-season collections: second-quarter operating cash flow was $1.10 billion and DSO was 57 days. Watch for positive operating cash flow and DSO no higher than 60 days; negative operating cash flow or DSO above 65 days would weaken the case.
• Prepayment and claim reversal: contract liabilities rose $700.2 million in the first half and unapproved change orders and claims stood at $411.1 million. Watch the nine-month change in contract liabilities and whether the claims balance rises again; a clear reversal in contract liabilities together with a rising claims balance would weaken the case.

Conclusion

Quanta's business is driven by utility transmission and interconnection spending, generation construction and large-load work such as data centers, and it converts backlog into revenue through its own craft workforce. In the second quarter of 2026 revenue rose 41.1% to $9.56 billion[2], Electric earned an 11.5% margin and Underground and Infrastructure 9.1%[7], total backlog reached $53.4 billion[4], and full-year revenue guidance was raised to $39.3 billion to $39.7 billion[5]; at the same time, long-term debt stood at $6.10 billion[26] and acquisitions are accelerating. The central unresolved relationship is whether margins and cash flow can scale with the business while organic growth, acquired revenue and the fixed price share all rise at once, rather than appearing only in favorable quarters.

Since the second-quarter results, only one independent analysis has qualified: an article by Aditya Raghunath of TIKR published on Yahoo Finance on September 18[50]. The author argues that second-quarter growth was broad rather than one-off and, more importantly, that "the largest projects, big transmission corridors and generation buildouts, aren't in backlog yet," with most of that work still in engineering and likely to show up through 2027 and beyond; the author also argues that the Electric margin could move toward its historical 10% to 12% ceiling over time, that self-performing 80% to 85% of work with craft-skilled labor gives Quanta an edge with large customers that need certainty on cost and timing, and cautions that long project cycles and lumpy bookings make outcomes highly dependent on execution and demand[50]. That view is consistent with the company's statement that NiSource and large transmission projects are not yet in backlog[44] and bears directly on the Electric peak-season margin debate; but it is a single outside interpretation rather than a shared market view, and it does not address the Underground and Infrastructure segment's reliance on acquisitions or peak-season cash flow.

Looking ahead, the current reading of demand conversion and improved execution would be materially strengthened if Electric holds its margin near 11.4% while growing more than 25% organically in the third quarter, Underground and Infrastructure revenue approaches $2.2 billion with positive organic growth, operating cash flow is positive with DSO no higher than 60 days, and large projects such as NiSource begin to be booked. Conversely, if the Electric margin falls below 10.5%, the Underground and Infrastructure increase comes almost entirely from acquisitions with negative organic growth, or operating cash flow turns negative and DSO returns above 65 days, the second-quarter performance would more likely reflect a combination of seasonality, acquisition mix and payment timing.

Sources

[1] Drillr earnings calendar (updated 2026-10-02) · PWR 2026-10-29 call · 2026-10-02 · Drillr earnings calendar

[2] PWR 8-K filed 2026-07-30 · Q2 2026 results and CEO statement · 2026-07-30 · 8-K · https://www.sec.gov/Archives/edgar/data/0001050915/000119312526324855/d56853dex991.htm

[3] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · Q2 2026 financial highlights and organic growth · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[4] PWR 8-K filed 2026-07-30 · backlog by segment at June 30 2026 · 2026-07-30 · 8-K · https://www.sec.gov/Archives/edgar/data/0001050915/000119312526324855/d56853dex991.htm

[5] PWR 8-K filed 2026-07-30 · raised full-year 2026 outlook · 2026-07-30 · 8-K · https://www.sec.gov/Archives/edgar/data/0001050915/000119312526324855/d56853dex991.htm

[6] Drillr analyst_financial_estimates (updated 2026-10-02) · PWR quarter ending 2026-09-30 · 2026-10-02 · Drillr analyst_financial_estimates · https://gateway.drillr.ai/mcp/private

[7] PWR 8-K filed 2026-07-30 · Q2 2026 segment results table · 2026-07-30 · 8-K · https://www.sec.gov/Archives/edgar/data/0001050915/000119312526324855/d56853dex991.htm

[8] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · Electric segment commentary · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[9] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · Underground and Infrastructure commentary · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[10] PWR 8-K filed 2026-07-30 · Q2 2026 free cash flow reconciliation · 2026-07-30 · 8-K · https://www.sec.gov/Archives/edgar/data/0001050915/000119312526324855/d56853dex991.htm

[11] PWR 10-Q filed 2026-07-30 · H1 2026 operating cash flow and DSO · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[12] PWR 10-K filed 2026-02-19 · 2025 overview and demand drivers · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[13] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · balance sheet and acquisitions · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[14] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · Q2 summary and acquisitions · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[15] PWR 10-K filed 2026-02-19 · workforce and collective bargaining · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[16] PWR 10-K filed 2026-02-19 · FY2025 consolidated results · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[17] PWR 10-K filed 2026-02-19 · FY2025 segment results · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[18] PWR 10-K filed 2026-02-19 · segment service descriptions · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[19] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · 2026 key markets outlook · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[20] PWR 10-K filed 2026-02-19 · FY2025 revenue by contract type · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[21] PWR 10-Q filed 2026-07-30 · Q2 2026 revenue by contract type · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[22] PWR 10-K filed 2026-02-19 · contract forms and pricing · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[23] PWR 10-K filed 2026-02-19 · customer concentration · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[24] PWR 10-K filed 2026-02-19 · segment operating expense composition · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[25] PWR 10-K filed 2026-02-19 · FY2025 operating cash flow, DSO and investing · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[26] PWR 10-Q filed 2026-07-30 · debt obligations at June 30 2026 · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[27] PWR 8-K filed 2026-04-30 · Q1 2026 results · 2026-04-30 · 8-K · https://www.sec.gov/Archives/edgar/data/0001050915/000119312526193918/d107542dex991.htm

[28] PWR 8-K filed 2026-04-30 · raised full-year 2026 outlook · 2026-04-30 · 8-K · https://www.sec.gov/Archives/edgar/data/0001050915/000119312526193918/d107542dex991.htm

[29] PWR 10-Q filed 2026-07-30 · Q2 2026 statements of operations · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[30] PWR 10-Q filed 2026-07-30 · working capital seasonality and liquidity · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[31] PWR 8-K filed 2026-05-27 · $1.0 billion stock repurchase program · 2026-05-27 · 8-K · https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001050915&type=8-K

[32] PWR 8-K filed 2026-08-04 · $2.0 billion senior notes offering · 2026-08-04 · 8-K · https://www.sec.gov/Archives/edgar/data/1050915/000119312526331400/

[33] PWR 10-Q filed 2026-07-30 · Electric segment results Q2 2026 · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[34] PWR 10-Q filed 2026-07-30 · Underground and Infrastructure segment results Q2 2026 · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[35] PWR 10-Q filed 2026-07-30 · backlog drivers · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[36] PWR 10-Q filed 2026-07-30 · H1 2026 cash flow statement · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[37] PWR 10-Q filed 2026-07-30 · H1 2026 acquisitions funding · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[38] PWR 10-K filed 2026-02-19 · Electric business environment · 2026-02-19 · 10-K · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000006/pwr-20251231.htm

[39] PWR Q2 2026 earnings call 2026-07-30 · segment commentary · 2026-07-30 · earnings-call · https://gateway.drillr.ai/mcp/private

[40] PWR Q2 2026 earnings call 2026-07-30 · management highlights · 2026-07-30 · earnings-call · https://gateway.drillr.ai/mcp/private

[41] PWR Q2 2026 earnings call 2026-07-30 · Q&A on data centers, labor and guidance · 2026-07-30 · earnings-call · https://gateway.drillr.ai/mcp/private

[42] PWR Q2 2026 earnings call 2026-07-30 · guidance and stated risks · 2026-07-30 · earnings-call · https://gateway.drillr.ai/mcp/private

[43] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · 2026 segment guidance · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[44] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · Electric backlog and NiSource program · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[45] PWR 10-Q filed 2026-07-30 · Electric segment results H1 2026 · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[46] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · free cash flow and DSO · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[47] PWR 10-Q filed 2026-07-30 · unapproved change orders and claims · 2026-07-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000025/pwr-20260630.htm

[48] PWR 10-Q filed 2026-04-30 · Q1 2026 operating cash flow and DSO · 2026-04-30 · 10-Q · https://www.sec.gov/Archives/edgar/data/1050915/000105091526000016/pwr-20260331.htm

[49] PWR Q2 2026 Operational and Financial Commentary 2026-07-30 (company results supplement) · full-year 2026 consolidated guidance · 2026-07-30 · quarterly-report · https://investors.quantaservices.com/_assets/_95becc6ca900e681cb865ad8da479315/quantaservices/db/917/10536/operational_and_financial_commentary/PWR+06-30-2026+ER+Operational+and+Financial+Summary+vF.pdf

[50] TIKR via Yahoo Finance 2026-09-18 · Quanta Services Stock Is Up 64% In A Year, Does PWR Still Have Room to Run? · 2026-09-18 · TIKR(刊于 Yahoo Finance) · https://finance.yahoo.com/markets/stocks/articles/quanta-services-stock-64-does-054039573.html