Exelon Corporation, a utility services holding company, engages in the energy distribution and transmission businesses in the United States and Canada. The company is involved in the purchase and regulated retail sale of electricity and natural gas, transmission and distribution of electricity, and distribution of natural gas to retail customers. It also offers support services, including legal, human resources, information technology, supply management, financial, engineering, customer operations, transmission and distribution planning, asset management, system operations, and power procurement services. It serves distribution utilities, municipalities, and financial institutions, as well as commercial, industrial, governmental, and residential customers. Exelon Corporation was incorporated in 1999 and is headquartered in Chicago, Illinois.

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.

CenterPoint Energy, Inc. operates as a public utility holding company in the United States. The company operates through two segments, Electric and Natural Gas. The Electric segment includes electric transmission and distribution services to electric customers and electric generation assets, as well as optimizes assets in the wholesale power market. The Natural Gas segment engages in the intrastate natural gas sales, and natural gas transportation and distribution for residential, commercial, industrial and institutional customers in Indiana, Louisiana, Minnesota, Mississippi, Ohio, and Texas; permanent pipeline connections through interconnects with various interstate and intrastate pipeline companies; and provides maintenance and repair services of home appliances to customers in Minnesota and home repair protection plans to natural gas customers in Indiana, Mississippi, Ohio, and Texas through a third party. It serves approximately 2,534,730 metered customers; owned 348 substations with transformer capacity of 79,719 megavolt amperes; and owned and operated 217 miles of intrastate pipeline in Louisiana and Texas. The company was founded in 1866 and is headquartered in Houston, Texas.

Fortis Inc. operates as an electric and gas utility company in Canada, the United States, and the Caribbean countries. It generates, transmits, and distributes electricity to approximately 447,000 retail customers in southeastern Arizona; and 103,000 retail customers in Arizona's Mohave and Santa Cruz counties with an aggregate capacity of 3,408 megawatts (MW), including 68 MW of solar capacity and 250 MV of wind capacity. The company also sells wholesale electricity to other entities in the western United States; owns gas-fired and hydroelectric generating capacity totaling 65 MW; and distributes natural gas to approximately 1,087,000 residential, commercial, and industrial customers in British Columbia, Canada. In addition, it owns and operates the electricity distribution system that serves approximately 592,000 customers in southern and central Alberta; owns four hydroelectric generating facilities with a combined capacity of 225 MW; and provides operation, maintenance, and management services to five hydroelectric generating facilities. Further, the company distributes electricity in the island portion of Newfoundland and Labrador with an installed generating capacity of 145 MW; and on Prince Edward Island with a generating capacity of 90 MW. Additionally, it provides integrated electric utility service to approximately 69,000 customers in Ontario; approximately 275,000 customers in Newfoundland and Labrador; approximately 34,000 customers on Grand Cayman, Cayman Islands; and approximately 17,000 customers on certain islands in Turks and Caicos. It also holds long-term contracted generation assets in Belize consisting of 3 hydroelectric generating facilities with a combined capacity of 51 MW; and the Aitken Creek natural gas storage facility. It also owns and operates approximately 90,500 circuit Kilometers (km) of distribution lines; and approximately 51,600 km of natural gas pipelines. Fortis Inc. was founded in 1885 and is headquartered in St. John's, Canada.

Pinnacle West Capital Corporation, through its subsidiary, provides retail and wholesale electric services primarily in the state of Arizona. The company engages in the generation, transmission, and distribution of electricity using coal, nuclear, gas, oil, and solar generating facilities. Its transmission facilities include overhead lines and underground lines; and distribution facilities consist of overhead lines and underground primary cables. The company also owns and maintains transmission and distribution substations; and owns energy storage facilities. Pinnacle West Capital Corporation was incorporated in 1985 and is headquartered in Phoenix, Arizona.

MasTec, Inc., an infrastructure construction company, provides engineering, building, installation, maintenance, and upgrade services for communications, energy, utility, and other infrastructure primarily in the United States and Canada. It operates through five segments: Communications, Clean Energy and Infrastructure, Oil and Gas, Power Delivery, and Other. The company build infrastructure for wireless and wireline/fiber communications; clean energy infrastructure comprising renewable energy power generation; pipeline infrastructure, including natural gas, water, carbon capture sequestration, and other product transport; power delivery services, such as electrical and gas transmission, and distribution systems; industrial and heavy civil infrastructure, including roads, bridges, and rail; and water infrastructure. It also installs electrical and other gas distribution and transmission systems, power generation, power generation, civil and industrial facilities, pipelines, and fiber optic and other cables, as well as install-to-the-home services. In addition, the company offers maintenance and upgrade support services comprising maintenance of customers' distribution facilities, networks, and infrastructure, including communications, power generation, pipeline, electrical distribution and transmission, and civil and industrial and heavy civil infrastructure; service restoration for natural disasters and accidents; and routine replacements and upgrades to overhauls. Its customers include wireless and wireline/fiber service providers, broadband operators, install-to-the-home service providers, public and private energy providers, including renewable and other energy providers, pipeline operators, civil and industrial infrastructure providers, and government entities. MasTec, Inc. was founded in 1929 and is headquartered in Coral Gables, Florida.

Southwest Gas Holdings, Inc., through its subsidiaries, distributes and transports natural gas in Arizona, Nevada, and California. The company operates through Natural Gas Distribution, Utility Infrastructure Services, and Pipeline and Storage segments. It also provides trenching, installation, and replacement of underground pipes, as well as maintenance services for energy distribution systems. As of December 31, 2023, it had 2,226,000 residential, commercial, industrial, and other natural gas customers. Southwest Gas Holdings, Inc. was incorporated in 1931 and is headquartered in Las Vegas, Nevada.

Northwest Natural Holding Company, through its subsidiary, Northwest Natural Gas Company, provides regulated natural gas distribution services to residential, commercial, and industrial customers in the United States. The company operates a mist gas storage facility contracted to other utilities, third-party marketers, and electric generators; offers natural gas asset management services; and operates an appliance retail center. It also engages in gas storage, water and wastewater, non-regulated renewable natural gas, and other investment businesses. In addition, the company provides natural gas service in Oregon and southwest Washington; and water and wastewater connections. Northwest Natural Holding Company was founded in 1859 and is headquartered in Portland, Oregon.