- Natural gas utility. Provides regulated service to customers in 12 states ranging from the Rocky Mountains to the Southeast, and manages pipelines and other industrial and municipal services in a larger region.
- An over-the-counter broker of natural gas, electricity and coal. Includes links and information about industry transportation, production and generation, financial markets, weather forecasting and hedging.
- Utility supplier of electric power and natural gas service in Colorado, Kansas, Michigan, Minnesota, New Mexico, North Dakota, Oklahoma, South Dakota, Texas and Wisconsin.
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