| | Enron Energy Services (Dublin, OH) Natural gas distribution | |
| | Equitable Gas Co (Leechburg, PA) Natural gas distribution | |
| | Equitable Resources Inc (Pittsburgh, PA) Natural gas distribution to consumers | |
| | Equitrans Inc (Waynesburg, PA) Natural gas transmission & distribution | |
| | Exelon Corp (Chicago, IL) Holding company for electric generation, retail distribution & transmission & natural gas distribution companies | |
| | Exelon Energy Co (Norristown, PA) Natural gas distribution to consumers | |
| | Fowler, W W Oil Co (Lithia Springs, GA) Manufacturing & distribution of natural gas & petroleum products | |
| | Great Lakes Energy Inc (Newaygo, MI) Provides electrical services & propane gas distribution to consumers | |
| | In Natural Gas Corp. (Paoli, IN) Natural gas distribution & transmission | |
| | Intercon Construction Inc (Madison, WI) Utility construction: natural gas transmission & distribution lines, electric ducts & cables, fiber optic cable, telephone & television cable installation | |
| | Jacobus Quick Slash (Janesville, WI) Gas, oil, diesel fuel, & grease distribution | |
| | Lansing Ice & Fuel Co (Lansing, MI) Heating oil & bottled gas dealer, petroleum & petroleum products wholesale, gas production & distribution | |
| | National Fuel Gas Distribution (Erie, PA) Natural gas distribution service | |
| | National Fuel Gas Supply Corp (Clark, PA) Natural gas distribution to consumers | |
| | Northern Indiana Fuel & Light (Auburn, IN) Billing office for natural gas distribution | |
