southwest gas holdings, inc., through its subsidiaries, purchases, distributes, and transports natural gas in arizona, nevada, and california. the company operates in two segments, natural gas operations and utility infrastructure services. as of december 31, 2019, it had 2,081,000 residential, commercial, industrial, and other natural gas customers. the company also provides trenching and installation, replacement, and maintenance services for energy distribution systems; and industrial construction solutions. southwest gas holdings, inc. was founded in 1931 and is headquartered in las vegas, nevada.