Chesapeake Utilities Corp. engages in the distribution and transmission of natural gas, propane and electricity, and the generation of electricity and steam. It operates through the Regulated Energy and Unregulated Energy segments. The Regulated Energy segment distributes and transmits gas, natural gas, and electricity. The Unregulated Energy segment markets and sells propane, crude oil, and natural gas. The company was founded in 1947 and is headquartered in Dover, DE.

Southwest Gas Holdings, Inc. engages in the energy business. It operates through the following business segments: Natural Gas Operations and Utility Infrastructure Services. The Natural Gas Operations segment focuses on purchasing, distribution, and transportation of natural gas in Arizona, California, and Nevada. The Utility Infrastructure Services segment consists of delivering an array of solutions to North America's gas and electric providers. The company was founded in March 1931 and is headquartered in Las Vegas, NV.

ONEOK, Inc. engages in gathering, processing, fractionating, transporting, storing and marketing of natural gas. It operates through the following segments: Natural Gas Gathering and Processing, Natural Gas Liquids and Natural Gas Pipelines. The Natural Gas Gathering and Processing segment offers midstream services to producers in North Dakota, Montana, Wyoming, Kansas and Oklahoma. The Natural Gas Liquids segment owns and operates facilities that gather, fractionate, treat and distribute NGLs and store NGL products, in Oklahoma, Kansas, Texas, New Mexico and the Rocky Mountain region, which includes the Williston, Powder River and DJ Basins, where it provides midstream services to producers of NGLs and deliver those products to the two market centers, one in the Mid-Continent in Conway, Kansas and the other in the Gulf Coast in Mont Belvieu, Texas. The Natural Gas Pipelines segment provides transportation and storage services to end users. The company was founded in 1906 and is headquartered in Tulsa, OK.