Quanta Services, Inc. provides infrastructure solutions for the electric and gas utility, renewable energy, communications, and pipeline and energy industries in the United States, Canada, Australia, and internationally. The company's Electric Power Infrastructure Solutions segment engages in the design, procurement, construction, upgrade, repair, and maintenance of electric power transmission and distribution infrastructure and substation facilities; installation, maintenance, and upgrade of electric power infrastructure projects; installation of smart grid technologies on electric power networks; and design, installation, maintenance, and repair of commercial and industrial wirings. This segment also offers aviation services; emergency restoration services; and other engineering and technical services; design and construction solutions to wireline and wireless communications, cable multi-system operators, and other customers; and training for electric workers, as well as training for the gas distribution and communications industries. The company's Renewable Energy Infrastructure Solutions segment is involved in engineering, procurement, construction, repair, and maintenance of wind, solar, and hydropower generation facilities, as well as battery storage facilities; and provision of engineering and construction services for substations and switchyards, transmission, and other electrical infrastructures. The company's Underground Utility and Infrastructure Solutions segment offers design, engineering, procurement, construction, upgrade, repair, and maintenance services for natural gas systems for gas utility customers; fabrication services for pipeline support systems and structures and facilities; and engineering and construction services for pipeline and storage systems, and compressor and pump stations. The company was formerly known as Fabal Construction, Inc. and changed its name to Quanta Services, Inc. in November 1997. The company was incorporated in 1997 and is headquartered in Houston, Texas.

Comfort Systems USA, Inc., together with its subsidiaries, provides mechanical and electrical installation, renovation, maintenance, repair, and replacement services for the mechanical and electrical services industry in the United States. It operates through two segments, Mechanical and Electrical. The company offers heating, ventilation, and air conditioning systems, as well as plumbing, electrical, piping and controls, off-site construction, monitoring, and fire protection. It also engages in the design, engineering, integration, installation, and start-up of mechanical, electrical, and plumbing (MEP) and related systems in new buildings; and renovation, expansion, maintenance, monitoring, repair, and replacement of MEP systems in existing buildings. In addition, the company provides remote monitoring of power usage, temperature, pressure, humidity and air flow for MEP and other building systems. It serves building owners and developers, general contractors, architects, consulting engineers, and property managers in the commercial, industrial, and institutional MEP markets. Comfort Systems USA, Inc. was founded in 1917 and is headquartered in Houston, Texas.

Fluor Corporation provides engineering, procurement, and construction (EPC); fabrication and modularization; operation and maintenance; asset integrity; and project management services worldwide. The company operates through Energy Solutions, Urban Solutions, Mission Solutions, and Other segments. The Energy Solutions segment provides solutions to the energy transition markets, including asset decarbonization, carbon capture, renewable fuels, waste-to-energy, green chemicals, hydrogen, nuclear power, and other low-carbon energy sources. It also provides consulting services, including feasibility studies, process assessments, and project finance structuring; and a range of services for small modular reactor technologies, conventional and advanced nuclear reactor technologies. This segment serves the production and fuels, chemicals, LNG, power markets, chemicals and petrochemical industries. The Urban Solutions segment offers EPC and project management services to the infrastructure, advanced technologies, life sciences, and mining and metals industries. This segment also provides staffing services to the company and third-party clients with technical, professional, and craft resources on a contract or permanent placement basis. The Mission Solutions segment offers technical solutions to the U.S. and other governments. It also delivers solutions for nuclear security and operation, nuclear waste management, and laboratory management; and operation and maintenance, logistics, EPC, and life support solutions for mission-critical facilities across U.S. military service organizations. This segment offers site management, environmental remediation, and decommissioning for nuclear remediation at governmental facilities, as well as services to commercial nuclear clients. Fluor Corporation was founded in 1912 and is headquartered in Irving, Texas.

Primoris Services Corporation, a specialty contractor company, provides a range of specialty construction, fabrication, maintenance, replacement, and engineering services in the United States and Canada. The company operates through Utilities and Energy/Renewables segments. The Utilities segment offers installation and maintenance services for new and existing natural gas distribution systems, electric utility distribution and transmission systems, and communications systems. The Energy/Renewables segment provides a range of services, including engineering, procurement, and construction, as well as retrofits, highway and bridge construction, demolition, site work, soil stabilization, excavation, flood control, upgrades, repairs, outages, and maintenance services to renewable energy and energy storage, renewable fuels, petroleum, and petrochemical industries, as well as state departments of transportation. It also offers pipeline construction and maintenance, and storage services; pipeline facility, and integrity services. Primoris Services Corporation was founded in 1960 and is headquartered in Dallas, Texas.

MYR Group Inc., through its subsidiaries, provides electrical construction services in the United States and Canada. It operates in two segments, Transmission and Distribution, and Commercial and Industrial. The Transmission and Distribution segment offers a range of services on electric transmission and distribution networks, and substation facilities, including design, engineering, procurement, construction, upgrade, maintenance, and repair services with primary focus on construction, maintenance, and repair to customers in the electric utility industry; and services, including construction and maintenance of high voltage transmission lines, substations, and lower voltage underground and overhead distribution systems, clean energy projects, and electric vehicle charging infrastructure services, as well as emergency restoration services in response to hurricane, wildfire, ice, or other related damages. This segment serves as a prime contractor to customers, such as investor-owned utilities, cooperatives, private developers, government-funded utilities, independent power producers, independent transmission companies, industrial facility owners, and other contractors. The Commercial and Industrial segment provides a range of services, including design, installation, maintenance, and repair of commercial and industrial wiring; and installation of intelligent transportation systems, roadway lighting, and signalization for airports, hospitals, data centers, hotels, stadiums, commercial and industrial facilities, clean energy projects, manufacturing plants, processing facilities, water/waste-water treatment facilities, mining facilities, intelligent transportation systems, roadway lighting, signalization, and electric vehicle charging infrastructure. This segment serves general contractors, commercial and industrial facility owners, governmental agencies, and developers. The company was founded in 1891 and is headquartered in Thornton, Colorado.

Bowman Consulting Group Ltd. provides a range of real estate, energy, infrastructure, and environmental management solutions in the United States. It offers civil and site engineering services, such as conceptual land planning, environmental consulting and permitting, planning/zoning and entitlements, roadway and highway designs, erosion and sediment designs, stormwater management designs, construction administration, traffic studies, floodplain studies, and utility relocation designs; and commissioning and energy efficiency services comprise construction observation, direct systems functional performance testing, system development readiness checklist, post occupancy review, review of construction documents, deferred/seasonal functional testing, final commissioning report, and commissioning review of submittals. The company also provides construction management services, including constructability review, value engineering, budgeting and cost estimating, interagency and utility coordination, onsite observation and report evaluation, public communication and outreach, and resident engineer services, as well as bid solicitation, documentation, and preparation services; and environmental consulting services consisting of wetlands and waters of the U.S. delineations, natural resources inventories, wildlife and vegetation surveys, threatened and endangered species surveys, endangered species conservation and management, wetland creation and enhancement design, NEPA documentation, section 404/401 permitting and compliance, NPDES permitting, and phase I environmental site assessment. In addition, it offers landscape architecture, land procurement and right-of-way acquisition, structural engineering, surveying and geospatial engineering, and transportation and water resources engineering services, as well as mechanical, electrical, and plumbing engineering services. The company was incorporated in 1995 and is headquartered in Reston, Virginia.

Matrix Service Company provides engineering, fabrication, construction, and maintenance services to support critical energy infrastructure and industrial markets in the United States, Canada, and internationally. The company's Storage and Terminal Solutions segment undertakes work related to aboveground crude oil and refined product storage tanks and terminals; engineering, procurement, fabrication, and construction services related to cryogenic, specialty tanks, and terminals for LNG, NGLs, hydrogen, ammonia, propane, butane, liquid nitrogen/liquid oxygen, and liquid petroleum; and provides plant work, truck and rail loading/offloading facilities, and marine structures, as well as storage tank and terminal maintenance and repair. This segment offers engineered specialty tank products, including geodesic domes, aluminum internal floating roofs, floating suction and skimmer systems, roof drain systems, and floating roof seals. Its Utility and Power Infrastructure segment offers power delivery services, including construction of new substations, upgrades of existing substations, transmission and distribution line installations, and upgrades and maintenance, and emergency and storm restoration services. This segment provides engineering, fabrication, and construction services for LNG utility peak shaving facilities; and construction and maintenance services to power generation facilities, including natural gas fired facilities. The company's Process and Industrial Facilities segment offers plant maintenance and turnarounds for refining and processing of crude oil, fractionating, and marketing of natural gas and natural gas liquids; engineering, procurement, fabrication, and construction for refinery upgrades and retrofits for hydrogen processing, production, loading, and distribution facilities; and constructs thermal vacuum test chambers for aerospace and defense, and other industries. The company was founded in 1984 and is headquartered in Tulsa, Oklahoma.

Energy Services of America Corporation, together with its subsidiaries, provides contracting services for utilities and energy related companies in the United States. The company constructs, replaces, and repairs interstate and intrastate natural gas pipelines and storage facilities for utility companies and private natural gas companies; and provides services relating to pipeline, storage facilities, and plant works. It also offers electrical and mechanical installation, and repair services, including substation and switchyard, site preparation, equipment setting, pipe fabrication and installation, packaged buildings, transformers, and other ancillary works for the gas, petroleum power, chemical, water and sewer, and automotive industries. In addition, the company provides corrosion protection services, horizontal drilling services, liquid pipeline and pump station construction, production facility construction, water and sewer pipeline installation, and various maintenance and repair services, as well as other services related to pipeline construction. Further, it serves customers primarily in West Virginia, Virginia, Ohio, Pennsylvania, and Kentucky. Energy Services of America Corporation was incorporated in 2006 and is based in Huntington, West Virginia.