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.

EMCOR Group, Inc. provides construction and facilities, building, and industrial services in the United States and the United Kingdom. It offers design, integration, installation, start-up, operation, and maintenance services related to power transmission, distribution, and generation systems; energy solutions; premises electrical and lighting systems; process instrumentation; low-voltage systems; voice and data communications systems; roadway and transit lighting, signaling, and fiber optic lines; computerized traffic control systems, and signal and communication equipment; heating, ventilation, air conditioning, refrigeration, and geothermal solutions; clean-room process ventilation systems; fire protection and suppression systems; plumbing, process, and high-purity piping systems; controls and filtration systems; water and wastewater treatment systems; central plant heating and cooling systems; crane and rigging services; millwright services; and steel fabrication, erection, and welding services. The company also provides building services that covers commercial and government site-based operations and maintenance; facility management, maintenance, and services; energy efficiency retrofit services; military base operations support services; services for indoor air quality; floor care and janitorial services; landscaping, lot sweeping, and snow removal services; vendor management and call center services; installation and support for building systems; program development, management, and maintenance for energy systems; technical consulting and diagnostic services; infrastructure and building projects; modification and retrofit projects; and other building services, including reception, security, and catering services. In addition, it offers refinery turnaround planning and engineering; welding; overhaul and maintenance; instrumentation and electrical; and renewable energy services. The company was incorporated in 1987 and is headquartered in Norwalk, Connecticut.

Dycom Industries, Inc. provides specialty contracting services to the telecommunications infrastructure and utility industries in the United States. The company offers engineering services to telecommunications providers, including the planning and design of aerial, underground, and buried fiber optic, copper, and coaxial cable systems; wireless networks in connection with the deployment of macro cell and new small cell sites; and program and project management and inspection personnel. It also provides construction, maintenance, and installation services for telephone companies and cable multiple system operators, such as placement and splicing of copper, fiber, and coaxial cables; tower construction, lines and antenna installation, foundation and equipment pad construction, and small cell site placement for wireless carriers, as well as equipment installation and material fabrication, and site testing services; underground facility locating services comprising locating telephone, cable television, power, water, sewer, and gas lines; installation and maintenance of customer premise equipment, including digital video recorders, set top boxes, and modems for cable system operators; and construction and maintenance services for electric and gas utilities, and other customers. Dycom Industries, Inc. was incorporated in 1969 and is headquartered in Palm Beach Gardens, Florida.

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.

Centuri Holdings, Inc. operates as a utility infrastructure services company in North America. It offers gas utility services, including maintenance, repair, installation, and replacement services for natural gas local distribution utility companies with focus on the modernization of infrastructure. The company also provides electric utility services comprising design, maintenance and repair, upgrade, and expansion services for transmission and distribution infrastructure. Its customers include electric, gas, and combination utility companies, as well as serves end markets, such as renewable energy and 5G datacom. The company was founded in 1909 and is headquartered in Phoenix, Arizona. Centuri Holdings, Inc. is a subsidiary of Southwest Gas Holdings, Inc.

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.

Mammoth Energy Services, Inc. operates as an energy services company in the United States, Canada, and internationally. The company operates in four segments: Well Completion Services, Infrastructure Services, Natural Sand Proppant Services, and Drilling Services. The company offers pressure pumping and hydraulic fracturing, sand hauling, and water transfer services; and master services agreements. It also provides a range of services on electric transmission and distribution, and networks and substation facilities, including engineering, design, construction, upgrade, maintenance, and repair of high voltage transmission lines, substations, and lower voltage overhead and underground distribution systems; storm repair and restoration services; and commercial services comprising installation, maintenance, and repair of commercial wiring. In addition, the company mines, processes, and sells natural sand proppant used for hydraulic fracturing; buys processed sand from suppliers on the spot market for resale; and provides logistics solutions to facilitate delivery of frac sand products. Further, it offers contract land and directional drilling services; and rig moving services. Additionally, the company offers aviation services, equipment rental, remote accommodation, and equipment manufacturing services. It serves government-funded, private, public investor-owned, and co-operative utilities; independent oil and natural gas producers; and land-based drilling contractors. The company was formerly known as Mammoth Energy Partners LP and changed its name to Mammoth Energy Services, Inc. in October 2016. Mammoth Energy Services, Inc. was founded in 2014 and is headquartered in Oklahoma City, Oklahoma.