The following discussion and analysis of the financial condition and results of operations of Quanta Services, Inc. (together with its subsidiaries, Quanta, we, us or our) should be read in conjunction with our condensed consolidated financial statements and related notes included elsewhere in this Quarterly Report and with our 2021 Annual Report, which was filed with the SEC on February 25, 2022 and is available on the SEC's website at www.sec.gov and on our website at www.quantaservices.com. The discussion below contains forward-looking statements that are based upon our current expectations and are subject to uncertainty and changes in circumstances. Actual results may differ materially from these expectations due to inaccurate assumptions and known or unknown risks and uncertainties, including those identified in Cautionary Statement About Forward-Looking Statements and Information above, in Item 1A. Risk Factors of Part II of this Quarterly Report and in Item 1A. Risk Factors of Part I of our 2021 Annual Report.

Overview

We are a leading provider of specialty contracting services, delivering comprehensive infrastructure solutions for the utility, renewable energy, communications, pipeline and energy industries in the United States, Canada, Australia and select other international markets. The performance of our business generally depends on our ability to obtain contracts with customers and to effectively deliver the services provided under those contracts. The services we provide include design, engineering, procurement, new construction, upgrade and repair and maintenance services for infrastructure within each of the industries we serve, such as electric power transmission and distribution networks; substation facilities; wind and solar energy generation and transmission and battery storage facilities; communications and cable multi-system operator networks; gas utility systems; pipeline transmission systems facilities; and downstream industrial facilities. Our customers include many of the leading companies in the industries we serve, and we endeavor to develop and maintain strategic alliances and preferred service provider status with our customers. Our services are typically provided pursuant to master service agreements, repair and maintenance contracts and fixed price and non-fixed price new construction contracts.

Beginning with the three months ended December 31, 2021, we report our results under three reportable segments: (1) Electric Power Infrastructure Solutions, (2) Renewable Energy Infrastructure Solutions and (3) Underground Utility and Infrastructure Solutions. In conjunction with this change, certain prior period amounts have been recast to conform to this new segment reporting structure. This structure is generally focused on broad end-user markets for our services. Included within the Electric Power Infrastructure Solutions segment are the results related to our communications infrastructure services.

Current Quarter Financial Results and Significant Operational Trends and Events

Key consolidated financial results for the three months ended March 31, 2022 included:

•Revenues increased 46.7%, or $1.26 billion, to $3.97 billion as compared to consolidated revenues of $2.70 billion for the three months ended March 31, 2021;

•Operating income increased 3.3%, or $3.8 million, to $117.5 million as compared to $113.7 million for the three months ended March 31, 2021;

•Net income attributable to common stock decreased 5.7%, or $5.1 million, to $84.6 million as compared to $89.8 million for the three months ended March 31, 2021;

•Diluted earnings per share decreased 8.1%, or $0.05, to $0.57 as compared to $0.62 for the three months ended March 31, 2021;

•EBITDA (a non-GAAP financial measure) increased 52.3%, or $105.0 million, to $305.8 million, as compared to $200.8 million for the three months ended March 31, 2021, and adjusted EBITDA (a non-GAAP financial measure) increased 56.9%, or $125.3 million, to $345.5 million, as compared to $220.2 million for the three months ended March 31, 2021;

•Net cash provided by operating activities decreased by 32%, or $40.5 million to $85.1 million, as compared to net cash provided by operating activities of $125.6 million for the three months ended March 31, 2021;

•Remaining performance obligations increased 16.1%, or $947.2 million, to $6.84 billion as of March 31, 2022 as compared to $5.90 billion as of December 31, 2021; and

•Total backlog (a non-GAAP financial measure) increased 6.1%, or $1.18 billion, to $20.5 billion as of March 31, 2022, as compared to $19.27 billion as of December 31, 2021.

For a reconciliation of EBITDA and adjusted EBITDA to net income attributable to common stock, the most comparable GAAP financial measure, and a reconciliation of backlog to remaining performance obligations, the most comparable GAAP financial measure, see Non-GAAP Financial Measures below.


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As described below, during the three months ended March 31, 2022, our results reflected certain significant operational trends and events as compared to the three months ended March 31, 2021, with certain of our segment results of operations recast to conform to our current segment reporting structure.

Electric Power Infrastructure Solutions Segment

•Revenues increased by 27.6% to $2.14 billion, as compared to $1.68 billion.

•Operating income increased by 32.3% to $203.4 million, as compared to $153.7 million, and operating margin increased to 9.5%, as compared to 9.2%.

•Revenues increased primarily due to increased spending by our utility customers on grid modernization and hardening, resulting in increased demand for our electric power services, as well as approximately $75 million of revenues attributable to acquired businesses.

•Operating income and operating margin increased in the three months ended March 31, 2022 due to the increase in revenues, which contributed to higher levels of fixed cost absorption, as well as improved performance by our telecommunications operations which experienced losses on projects during the three months ended March 31, 2021. The increase in operating margin was also attributable to a $10.0 million increase in equity in earnings from LUMA and other integral affiliates.

Renewable Energy Infrastructure Solutions Segment

•Revenues increased by 128.0% to $875.6 million, as compared to $384.1 million.

•Operating income increased by 54.4% to $69.9 million, as compared to $45.3 million, and operating margin decreased to 8.0%, as compared to 11.8%.

•Revenues increased primarily due to a $470 million increase in revenues attributable to acquired businesses, mainly Blattner, which was acquired in October 2021. The remaining increase in revenues was primarily due to increased transmission and interconnection construction services related to renewable generation infrastructure.

•The increase in operating income was primarily due to higher revenues associated with the acquisition of Blattner. The decrease in operating margin was primarily due to the change in the mix of work due to the acquired revenues as well as favorable close-out of certain projects during the three months ended March 31, 2021, and the normal variability associated with the timing of projects.

Underground Utility and Infrastructure Solutions Segment

•Revenues increased by 47.8% to $951.2 million, as compared to $643.5 million.

•Operating income increased by 446.6% to $48.2 million, as compared to $8.8 million, and operating margin increased to 5.1%, as compared to 1.4%.

•Revenues increased primarily due to higher demand from our gas utility and industrial customers, as well as an increase in revenues associated with larger pipeline projects.

•Operating income and operating margin increased in the three months ended March 31, 2022 due to the increase in revenues, which contributed to higher levels of fixed cost absorption. Also contributing to the increases were improved performance across the segment, including in our industrial services operations due to the reduced negative impacts of the COVID-19 pandemic as compared to the same period in 2021, as well as favorable project timing and project mix.

See Business Environment, Results of Operations and Liquidity and Capital Resources below for additional information and discussion related to consolidated and segment results.

Business Environment

We believe there are long-term growth opportunities across our industries, and we continue to have a positive long-term outlook. Although not without risks and challenges, including those discussed in Cautionary Statement About Forward-Looking Statements and Information, Item 1A. Risk Factors of Part II of this Quarterly Report and Item 1A. Risk Factors of Part I of our 2021 Annual Report, we believe, with our full-service operations, broad geographic reach, financial position and technical expertise, we are well positioned to capitalize on opportunities and trends in our industries.


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Electric Power Infrastructure Solutions. Utilities are continuing to invest significant capital in their electric power delivery systems, particularly transmission, substation and distribution infrastructure, through multi-year, multi-billion dollar grid modernization and reliability programs, which have provided, and are expected to continue to provide, demand for our services. While the COVID-19 pandemic resulted in a short-term overall decline in electricity usage in 2020, primarily related to commercial and industrial users, demand recovered and continued to increase in 2021, and we expect demand for electricity in North America to grow over the long term and believe that certain segments of the North American electric power grid are not adequate to efficiently serve the power needs of the future. Furthermore, to the extent that electrification trends increase, including through, among other things, electric vehicle (EV) adoption, demand for electricity could be greater than currently anticipated. To accommodate this growth, we expect continued demand for new or expanded transmission, substation and distribution infrastructure to reliably transport power to meet demand driven by electrification and the modification and reengineering of existing infrastructure as existing coal and nuclear generation facilities are retired or shut down. In order to reliably and efficiently deliver power, and in response to federal reliability standards, utilities are also integrating smart grid technologies into distribution systems to improve grid management and create efficiencies, and in preparation for emerging technologies, such as EVs.

A number of utilities also continue to implement system upgrades and hardening programs in response to recurring severe weather events, such as hurricanes and wildfires. For example, utilities along the Eastern and Gulf Coasts of the United States are executing storm hardening programs to make their systems more resilient to hurricanes and other severe weather events, which we expect to continue for the foreseeable future. Additionally, there are significant system resiliency initiatives underway in California and other regions in the western United States that are designed to prevent and manage the impact of wildfires. While these resiliency initiatives provide additional opportunities for our services, they also increase our potential exposure to significant liabilities, as these events can be started by the failure of electric power and other infrastructure on which we have performed services. Utilities are also executing significant initiatives to underground critical infrastructure, including additional underground transmission and distribution initiatives by utilities in California, underground transmission projects in the northeast United States, underground distribution circuits along the U.S. coastlines and underground transmission lines for offshore wind generation projects.

With respect to our communications service offerings, which are focused on the North American market, consumer and commercial demand for communication and data-intensive, high-bandwidth wireline and wireless services and applications is driving significant investment in infrastructure and the deployment of new technologies. In particular, communications providers are in the early stages of developing new fifth generation wireless services (5G), which are intended to facilitate bandwidth-intensive services at high speeds for consumers and commercial applications. Additionally, recent legislative and regulatory initiatives, including the Rural Digital Opportunity Fund and the Infrastructure Investment and Jobs Act, have dedicated billions of dollars of funding to support broadband service to underserved markets. As a result of these industry trends, we believe there will be meaningful demand for our engineering and construction services.

Renewable Energy Infrastructure Solutions. We believe the transition to a carbon-neutral economy, which is being driven by consumer and investor preferences, increasing electrification trends, supportive public policy actions and declining levelized costs of renewable energy, will require sizeable long-term investment in renewable generation and related infrastructure, including meaningful repowering and modernization of existing assets. To that end, renewable energy developers are expected to continue to increase investments in wind and solar projects, as well as energy storage projects. Utilities have increased the percentage of renewable electricity bought through power purchase agreements (PPAs) with renewable energy developers, and we believe are in the early stages of investing directly in renewable generation facilities, which could expand significantly over time as they pursue clean energy strategies and emissions-reduction initiatives. Also, a growing number of corporate enterprises, particularly technology companies, are entering into PPAs with renewable energy developers to source renewable electricity to power their facilities and achieve their own carbon-reduction initiatives. We believe increased battery storage can support increased renewable energy development by providing shorter-term storage of electricity from renewable energy generation, particularly from solar facilities, which helps to manage the amount and timing of intermittent power placed on the grid from renewable generation. Though current battery storage capacity is much smaller than the amount of wind and solar capacity installed in North America, utility-scale battery storage capacity is expected to grow significantly and at higher rates over the longer term.

We believe these dynamics will generate significant demand for our renewable energy infrastructure services, including our generation construction services and engineering expertise in utility-scale solar, wind and battery storage projects, as well as our services related to the development and construction of related infrastructure, including high-voltage electric transmission and substation infrastructure, that are necessary to interconnect and transmit electricity from new renewable energy generation facilities into the existing electric power grid and enhance grid reliability. While in the short term and in any given period the demand for certain renewable energy services could fluctuate due to, among other things, supply chain and other logistical difficulties that could delay projects, the availability of production tax credits, permitting delays, or sourcing restrictions, tariffs, duties, taxes and other assessments on materials and components necessary for certain projects (e.g., solar panels), we believe


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we are well positioned, through our acquisition of Blattner and our existing renewable energy and transmission services offerings, to capitalize on these growth trends over the long term.

Underground Utility and Infrastructure Solutions. Within this segment, we have focused on specialty services and industries that we believe are driven by regulated utility spending, regulation, replacement and rehabilitation of aging infrastructure and safety and environmental initiatives, including gas utility services, pipeline integrity and transmission services and downstream industrial services. We believe demand for our gas utility distribution services will increase as a result of customer desire to upgrade and replace aging infrastructure and increasing regulatory requirements. In particular, natural gas utilities have implemented multi-decade modernization programs to replace aging cast iron, bare steel and plastic system infrastructure with modern materials for safety, reliability and environmental purposes. We believe there are also growth opportunities for our pipeline integrity, rehabilitation and replacement services, as regulatory measures have increased the frequency and stringency of pipeline integrity testing requirements that require our customers to test, inspect, repair, maintain and replace pipeline infrastructure to ensure that it operates in a safe, reliable and environmentally conscious manner. Further, permitting challenges associated with construction of new pipelines can make existing pipeline infrastructure more valuable, motivating owners to extend the useful life of existing pipeline assets through integrity initiatives. Additionally, we believe there are significant long-term opportunities for our downstream industrial services, including our high-pressure and critical-path turnaround services, as well as our capabilities with respect to instrumentation and electrical services, piping, fabrication and storage tanks services, and other industrial services, and that processing facilities located along the U.S. Gulf Coast region should have certain long-term strategic advantages due to their proximity to competitively priced and abundant hydrocarbon resources.

Certain of these services were impacted in 2020 and 2021 by the COVID-19 pandemic and broader economic challenges and uncertainties in the energy market. For example, demand for our midstream and industrial services operations declined substantially in 2020 and 2021 as customers reduced and deferred regularly scheduled maintenance and capital projects due to lack of demand for refined products and economic uncertainty. Demand for these services has improved in the first part of 2022 as customers are moving forward with their deferred maintenance and capital spending, and to the extent energy market conditions remain accommodating and the global economy continues to recover, we believe the outlook for these services will continue to improve throughout 2022. Additionally, in any given period, downstream processing facilities can be negatively impacted due to severe weather events, such as hurricanes, tropical storms and floods. Furthermore, the broader oil and gas industry is cyclical and subject to price and production volume volatility, which can impact demand for certain of our ancillary and pipeline services. particularly in markets where the price of oil is influential, such as Australia, the Canadian Oil Sands and certain oil-driven U.S. shale formations. Revenues related to larger U.S. pipeline projects have declined significantly over the last few years as the pipeline and related infrastructure development necessary to support U.S. shale formations has largely been completed. Additionally, the development of new larger pipeline projects continues to be negatively impacted in the United States by a more challenging permitting and regulatory environment, as well as challenging economic and market conditions caused by the COVID-19 pandemic. However, there has been an increase in activity in the Canadian large pipe market which is currently active with a number of major projects underway, and we continue to pursue these larger pipeline project opportunities to the extent they satisfy our margin and risk profiles and support the needs of our customers. We believe our strategic decision to increase our focus on specialty services and industries that are driven by regulated utility spending, regulation, replacement and rehabilitation of aging infrastructure and safety and environmental initiatives should provide a greater level of business sustainability and predictability and help to offset the cyclicality of our larger pipeline project business.

Lastly, we believe there are additional longer-term opportunities that may arise in this segment. For example, we believe natural gas, due to its expected abundant supply and attractive price over the long-term, will remain a fuel of choice for both primary power generation and backup power generation for renewable power plants in North America. We believe the favorable characteristics of natural gas could also position North America as a leading competitor in the global LNG export market, which could provide additional opportunities for our pipeline infrastructure services. We also believe that customers in this segment are implementing strategies to reduce carbon emissions produced from their operations, which are providing incremental opportunities for our services, including developing infrastructure for blending hydrogen into natural gas flow to customers, carbon capture projects, which could include building or repurposing pipeline infrastructure.

COVID-19 Pandemic and Impact. The effects of the COVID-19 pandemic continue to significantly impact certain aspects and geographies of the global economy due to, among other things, workforce and travel restrictions and supply chain, production and other logistical disruptions. While we have continued to operate substantially all of our activities as a provider of essential services, during the course of the pandemic our operations and financial results have been adversely impacted by reduced customer spending and demand for certain of our services (including as described above), as well as governmental responses to the COVID-19 pandemic, including shut-down orders and limitations on work site practices implemented by governments, certain of which in Canada and Australia continued to impact our business in 2021 and early 2022. Additionally, we continue to monitor governmental and customer vaccination and testing standards or requirements related to COVID-19, as well as certain standards and guidance as to preventing the spread of COVID-19. While the overall impact of these standards,


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requirements and guidance has lessened during the first part of 2022, we expect that requirements in certain jurisdictions and with respect to certain customers will remain in place and additional requirements could arise in the future to the extent the COVID-19 pandemic continues or worsens.

The broader and longer-term implications of the COVID-19 pandemic on our results of operations and overall financial performance and position remain highly uncertain and variable, and we expect continued operational challenges for portions of our operations in the future. The future impact that the pandemic, or any resulting market disruption and volatility, will have on our business, cash flows, liquidity, financial condition and results of operations will depend on future developments, including, among others, the duration and severity of the pandemic; the actions taken by governmental authorities, customers, suppliers and other third parties in response to the pandemic and the consequences of those actions; our workforce availability; and the timing and extent to which normal economic and operating conditions resume and continue.

Regulatory Challenges and Opportunities. The regulatory environment creates both challenges and opportunities for our business, and in recent years our margins have been impacted by regulatory and permitting delays, as well as private legal challenges related to regulatory requirements, particularly with respect to large transmission and large pipeline projects. As a result, regulatory and environmental permitting processes continue to create uncertainty for projects and negatively impact customer spending. However, we believe that there are also several existing, pending or proposed legislative or regulatory actions that may alleviate certain regulatory and permitting issues and positively impact long-term demand, particularly in connection with electric power infrastructure and renewable energy spending. For example, regulatory changes affecting siting and right-of-way processes could potentially accelerate construction for transmission projects, and state and federal reliability standards are creating incentives for both electrical and pipeline system investment and maintenance. Additionally, as described above, we consider renewable energy, including solar and wind generation and battery storage facilities, to be an ongoing opportunity; however, demand for our services depends on policy and economic incentives designed to support and encourage such projects and any tariffs, duties, taxes, assessments, or other limitations on the availability or sourcing of materials or components for such projects can increase costs for customers and create variability of project timing. For example, we are monitoring the U.S. Department of Commerce's investigation into an antidumping and countervailing duties circumvention claim on solar cells and panels supplied from Malaysia, Vietnam, Thailand and Cambodia, which is disrupting the solar panel supply chain and creating uncertainty regarding the timing of development and/or financing of certain renewable energy projects in the near term.

Labor Resource Availability and Cost. We continue to address the longer-term need for additional labor resources in our markets, as our customers continue to seek additional specialized labor resources to offset an aging utility workforce and longer-term labor availability issues, increasing pressure to reduce costs and improve reliability, and increasing duration and complexity of their capital programs. We believe these trends will continue, possibly to such a degree that demand for labor resources will outpace supply. Furthermore, the increased demand for our services based on the dynamics described above can create shortages of qualified labor in our markets. Our ability to capitalize on available opportunities is limited by our ability to employ, train and retain the necessary skilled personnel, and therefore we are taking proactive steps to develop our workforce, including through strategic relationships with universities, the military and unions and the expansion and development of our training facility and postsecondary educational institution. Although we believe these initiatives will help address workforce needs, meeting our customers' demand for labor resources could prove challenging.

Additionally, we monitor our labor markets and expect labor costs to continue to increase based on increased demand for our services. Our labor costs are passed through in certain of our contracts, and the portion of our workforce that is represented by labor unions typically operate under multi-year collective bargaining agreements, which provide some visibility into future labor costs. While we do not currently believe this environment will materially impact our profitability and would expect to be able to adjust contract pricing with certain customers to the extent wages and other labor costs increase, whether due to renegotiation of collective bargaining agreements or market conditions, meaningful increases in our labor costs could have a material adverse effect on our business, financial condition, results of operations or cash flows to the extent we cannot do so. Furthermore, increased labor costs could impact our customers' decision-making with respect to the viability or timing of certain projects.

Materials and Equipment Procurement. We continue to monitor supply chain and other logistical challenges, global trade relationships (e.g., tariffs, duties, taxes, sourcing restrictions) and other general market and political conditions (e.g., inflation) with respect to availability and costs of certain materials and equipment necessary for the performance of our business and for materials necessary for our customers' projects, including, among other things, steel, copper, aluminum, and components for renewable energy projects. Increased costs and delays can impact project construction schedules and the performance of our services. For example, we believe some participants in the renewable energy market are experiencing supply chain challenges, resulting in delays and shortages of, and increased costs for, materials necessary for the construction of certain renewable energy projects in the near term, including as a result of sourcing restrictions related to solar panels manufactured in China and the Department of Commerce investigation described above. While we believe many of our renewable energy customers are generally better equipped to manage near-term supply chain disruptions than their smaller competitors, these challenges could


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delay our customers' ongoing projects or impact their future project schedules, which in turn could impact the timing of or demand for our renewable energy services. While these delays are not anticipated to result in exposure to liquidated damages or commodity risks, such delays could cause customers to cancel projects as higher than expected costs impact project profitability projections.

Additionally, based on, among other things, the significant worldwide shortage of semiconductors, vehicle manufacturers are experiencing production delays with respect to new vehicles for our fleet (both on-road and specialty vehicles) and vehicle parts (e.g., tires), all of which we utilize in our operations, and certain of our vehicle delivery orders scheduled for delivery in 2022 have been delayed or cancelled. While we believe we have taken steps to secure delivery of a sufficient amount of vehicles in the near term and do not anticipate any significant disruptions with respect to our fleet, to the extent the production issues become worse than expected or become longer-term in nature, our operations could be negatively impacted. In addition, as a result of the recent inflationary pressure, including with respect to the cost of materials, equipment and fuel, our results of operations could be materially impacted to the extent we are not able to pass such costs through to our customers.

Acquisitions and Investments. We believe potential acquisition and investment opportunities exist in our industries and adjacent industries, primarily due to the highly fragmented and evolving nature of those industries and inability of many companies to expand due to capital or liquidity constraints. While the desirability of certain of these opportunities could be impacted by the recent inflationary pressure in the short term, we continue to evaluate opportunities that are expected to, among other things, broaden our customer base, expand our geographic area of operations and grow and diversify our portfolio of services.

Significant Factors Impacting Results

Our revenues, profit, margins and other results of operations can be influenced by a variety of factors in any given period, including those described in Business Environment above and Item 1A. Risk Factors of Part I of our 2021 Annual Report, and those factors have caused fluctuations in our results in the past and are expected to cause fluctuations in our results in the future. Additional information with respect to certain of those factors is provided below.

Seasonality. Typically, our revenues are lowest in the first quarter of the year because cold, snowy or wet conditions can create challenging working environments that are more costly for our customers or cause delays on projects. In addition, infrastructure projects often do not begin in a meaningful way until our customers finalize their capital budgets, which typically occurs during the first quarter. Second quarter revenues are typically higher than those in the first quarter, as some projects begin, but continued cold and wet weather can often impact productivity. Third quarter revenues are typically the highest of the year, as a greater number of projects are underway and operating conditions, including weather, are normally more accommodating. Generally, revenues during the fourth quarter are lower than the third quarter but higher than the second quarter, as many projects are completed and customers often seek to spend their capital budgets before year end. However, the holiday season and inclement weather can sometimes cause delays during the fourth quarter, reducing revenues and increasing costs. These seasonal impacts are typical for our U.S. operations, but seasonality for our international operations may differ. For example, revenues in Canada are typically higher in the first quarter because projects are often accelerated in order to complete work while the ground is frozen and prior to the break up, or seasonal thaw, as productivity is adversely affected by wet ground conditions during warmer months.

Weather, natural disasters and emergencies. The results of our business in a given period can be impacted by adverse weather conditions, severe weather events, natural disasters or other emergencies, which include, among other things, heavy or prolonged snowfall or rainfall, hurricanes, tropical storms, tornadoes, floods, blizzards, extreme temperatures, wildfires, post-wildfire floods and debris flows, pandemics (including the ongoing COVID-19 pandemic, as described above) and earthquakes. These conditions and events can negatively impact our financial results due to, among other things, the termination, deferral or delay of projects, reduced productivity and exposure to significant liabilities. However, severe weather events can also increase our emergency restoration services, which typically yield higher margins due in part to higher equipment utilization and absorption of fixed costs, and in 2020 and 2021 we had record levels of emergency restoration services.

Demand for services. We perform the majority of our services under existing contracts, including master service agreements (MSAs) and similar agreements pursuant to which our customers are not committed to specific volumes of our services. Therefore our volume of business can be positively or negatively affected by fluctuations in the amount of work our customers assign us in a given period, which may vary by geographic region. For example, to the extent our customers accelerate grid modernization or hardening programs or face deadlines to meet regulatory requirements for rehabilitation, reliability or efficiency, our volume of work could increase under existing agreements. Also, as described above in Business Environment, we have experienced reductions in demand for certain services as a result of uncertainties and challenges in the energy market and overall economy caused by the COVID-19 pandemic. Examples of other items that may cause demand for our services to fluctuate materially from quarter to quarter include: the financial condition of our customers, their capital


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spending and their access to capital; economic and political conditions on a regional, national or global scale, including availability of renewable energy tax credits; interest rates; governmental regulations affecting the sourcing and costs of materials and equipment; other changes in U.S. and global trade relationships; and project deferrals and cancellations.

Revenue mix and impact on margins. The mix of revenues based on the types of services we provide in a given period will impact margins, as certain industries and services provide higher-margin opportunities. Our larger or more complex projects typically include, among others, transmission projects with higher voltage capacities; pipeline projects with larger-diameter throughput capacities; large-scale renewable generation projects, which we expect to increase subsequent to our acquisition of Blattner; and projects with increased engineering, design or construction complexities, more difficult terrain or geographical requirements, or longer distance requirements. These projects typically yield opportunities for higher margins than our recurring services under MSAs described above, as we assume a greater degree of performance risk and there is greater utilization of our resources for longer construction timeframes. However, larger projects are subject to additional risk of regulatory delay and cyclicality. For example, our revenues with respect to large pipeline projects have declined significantly in recent years, and a significant number of larger projects have been delayed or cancelled during that same period. Project schedules also fluctuate, particularly in connection with larger, more complex or longer-term projects, which can affect the amount of work performed in a given period. Furthermore, smaller or less complex projects typically have a greater number of companies competing for them, and competitors at times may more aggressively pursue available work. A greater percentage of smaller scale or less complex work also could negatively impact margins due to the inefficiency of transitioning between a greater number of smaller projects versus continuous production on fewer larger projects. As a result, at times we may choose to maintain a portion of our workforce and equipment in an underutilized capacity to ensure we are strategically positioned to deliver on larger projects when they move forward.

Project variability and performance. Margins for a single project may fluctuate period to period due to changes in the volume or type of work performed, the pricing structure under the project contract or job productivity. Additionally, our productivity and performance on a project can vary period to period based on a number of factors, including unexpected project difficulties or site conditions (including in connection with difficult geographic characteristics); project location, including locations with challenging operating conditions; whether the work is on an open or encumbered right of way; inclement weather or severe weather events; environmental restrictions or regulatory delays; protests, other political activity or legal challenges related to a project; the performance of third parties; and the impact of the COVID-19 pandemic. Moreover, we currently generate a significant portion of our revenues under fixed price contracts, and fixed price contracts are more common in connection with our larger and more complex projects that typically involve greater performance risk. Under these contracts, we assume risks related to project estimates and execution, and project revenues can vary, sometimes substantially, from our original projections due to a variety of factors, including the additional complexity, timing uncertainty or extended bidding, regulatory and permitting processes associated with these projects. These variations can result in a reduction in expected profit or the incurrence of losses on a project or the issuance of change orders or assertion of contract claims against customers. See Revenue Recognition - Contract Estimates and Changes in Estimates in Note 4 of the Notes to Condensed Consolidated Financial Statements in Item 1. Financial Statements of Part I of this Quarterly Report for further information regarding changes in estimated contract revenues and/or project costs, including any significant project gains or losses in connection with fixed price contracts that have impacted our results, and determinations with respect to the recognition of change orders and claims as contract price adjustments.

Subcontract work and provision of materials. Work that is subcontracted to other service providers generally yields lower margins, and therefore an increase in subcontract work in a given period can decrease margins. In recent years, we have subcontracted approximately 20% of our work to other service providers. Our customers are usually responsible for supplying the materials for their projects. However, under some contracts, including contracts for projects where we provide engineering, procurement and construction (EPC) services, we agree to procure all or part of the required materials. Margins may be lower on projects where we furnish a significant amount of materials, as our markup on materials is generally lower than our markup on labor costs, and in a given period an increase in the percentage of work with greater materials procurement requirements may decrease our overall margins. Furthermore, as discussed further in Business Environment, fluctuations in the price or availability of materials and equipment we or our customers utilize could impact demand for our services or costs to complete projects.

Foreign currency risk. Our financial performance is reported on a U.S. dollar-denominated basis but is partially subject to fluctuations in foreign currency exchange rates. Fluctuations in exchange rates relative to the U.S. dollar, primarily Canadian dollars and Australian dollars, can materially impact our results of operations and impact comparability between periods.



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Results of Operations

A discussion of the changes in our consolidated and segment results of operations between the three months ended March 31, 2022 and March 31, 2021 is included below, with certain of our segment results of operations recast to conform to our current segment reporting structure. The results of acquired businesses have been included in the following results of operations since their respective acquisition dates.

The following table sets forth selected statements of operations data, such data as a percentage of revenues for the periods indicated, as well as the dollar and percentage change from the prior period (dollars in thousands):

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