Black Hills Energy
Black Hills Energy serves over 1 million gas customers in Arkansas, Colorado, Iowa, Kansas, Montana, Nebraska, and Wyoming. Black Hills Energy is a growth-oriented, vertically integrated energy company with a mission of improving life with energy and a vision to be the energy partner of choice. The company's corporate headquarters is located in Rapid City SD and has other main offices supporting gas operations in Denver, CO and Papillion NE.

The company's non-regulated businesses generate wholesale electricity, produce natural gas, oil and coal, and market energy. Black Hills employees partner to produce results that improve life with energy.

CenterPoint Energy

CenterPoint Energy
Headquartered in Houston, Texas, CenterPoint Energy, Inc. is an energy delivery company with regulated natural gas and electric utility businesses in eight states and a competitive energy business footprint in nearly 40 states. CenterPoint Energy’s natural gas transmission and distribution businesses have been serving customers for more than a century. The company owns and operates about 140,000 miles of mains and services that deliver gas to communities in Arkansas, Indiana, Louisiana, Minnesota, Mississippi, Oklahoma, Ohio and Texas. This makes CenterPoint Energy one of the largest publicly traded natural gas distribution companies in the country.

Colorado Springs Utilities
Colorado Springs Utilities is a four-service municipality serving natural gas, electricity, water and waste water. Our gas service territory spans 524 square miles. We have almost 2,550 miles of natural gas distribution pipeline providing gas service to nearly 205,000 customers.


Eversource Energy
Eversource is New England’s largest energy delivery company, safely and reliably delivering energy to approximately 3.7 million natural gas and electric customers in Connecticut, Massachusetts and New Hampshire.

Our natural gas distribution system spans 6,459 miles across Connecticut and Massachusetts serving over 500,000 natural gas customers in 122 communities.


NiSource Inc.
NiSource Inc. is a leading natural gas and electric utility company. Our approximately 8,000 employees ensure Columbia Gas and NIPSCO customers have the energy they need across seven states.

Focused on strategically investing in our energy infrastructure – between $1.6 billion - $1.8 billion annually through 2020 – we will be able to meet our customer commitments for the next 100 years.

It’s all about our customers. By investing at record levels, we’re:

  • Improving reliability and safety for our customers and our communities
  • Making it easier for customers to do business with us
  • Providing additional access to natural gas and electric service
  • Reducing emissions and preserving our natural resources
One Gas

One Gas
ONE Gas is one of the largest natural gas utilities in the United States, providing natural gas distribution services to more than 2 million residential, commercial, industrial, transportation and wholesale customers in Oklahoma, Kansas and Texas.

Headquartered in Tulsa, Oklahoma, its divisions include Oklahoma Natural Gas, the largest natural gas distributor in Oklahoma; Kansas Gas Service, the largest in Kansas; and Texas Gas Service, the third largest in Texas, in terms of customers.

Pacific Gas & Electric Company
Pacific Gas and Electric Company is one of the largest combined natural gas and electric energy companies in the United States. Based in San Francisco, PG&E has 42,000 miles of gas distribution pipeline and 6,400 miles of transmission pipelines, which delivers some of the nation’s cleanest energy to nearly 4.3 million people, covering 70,000 square miles in Northern and Central California.

Puget Sound Energy

Puget Sound Energy
PSE serves 840,000 natural gas customers and has 26,000 miles of distribution pipeline, primarily in the Puget Sound region of western Washington. They also serve 1.1 million electric customers. PSE is headquartered in Bellevue and has 3,100 employees. Approximately 4 million people live in its service area, which covers approximately 6,000 square miles.

San Diego Gas & Electric Company
Founded in 1881, San Diego Gas & Electric (SDG&E) is a natural gas and electric utility serving San Diego and Orange Counties in southern California. SDG&E provides natural gas service to 873,000 customers and spans 4,100 square miles.

San Diego Gas & Electric Company is a regulated subsidiary of Sempra Energy, a Fortune 500 energy services holding company based in San Diego.

As the nation's largest natural gas distribution utility, we deliver clean, safe and reliable energy to 21.6 million consumers through 5.9 million meters in more than 500 communities. Our service territory encompasses approximately 20,000 square miles in diverse terrain throughout Central and Southern California, from Visalia to the Mexican border.

SoCalGas is a regulated subsidiary of Sempra Energy, a Fortune 500 energy services holding company based in San Diego.

Southwest Gas
Southwest Gas was founded in 1931 and is headquartered in Las Vegas, NV. With over 31,000 miles of distribution pipeline, the company provides natural gas service to more than 2 million customers in Arizona, Nevada, and portions of California.


Summit Utilities
Summit Utilities, Inc. owns natural gas distribution and transmission subsidiaries that operate in Arkansas, Colorado, Maine, Missouri, Oklahoma, and Texas. The company provides safe, clean and affordable natural gas to businesses and residents in six states through Arkansas Oklahoma Gas, Colorado Natural Gas, Summit Natural Gas of Maine, Summit Natural Gas of Missouri, Summit Utilities of Arkansas, and Summit Utilities of Oklahoma. Each of Summit’s natural gas distribution and transmission subsidiaries constructs and installs natural gas distribution systems with the goal of supporting economic development by providing clean-burning, safe and reliable natural gas to residential and commercial customers through exceptional customer service and commitment to community. Overall, Summit entities serve approximately 625,000 customers and operate more than 23,400 miles of pipeline.

Xcel Energy
Xcel Energy is a natural gas and electric utility with facilities in 9 states. Headquartered in Minneapolis, MN, the company's service territory spans 8 states, with natural gas distribution in 5 states. Xcel Energy has almost 35,000 miles of natural gas distribution pipeline providing gas service to nearly 2 million customers in Colorado, Minnesota, North Dakota, Wisconsin and Michigan. The total service territory (natural gas & electricity) for Xcel Energy covers over 110,000 square miles.