| Customer Name |
State |
| Alliant Energy |
IA |
| American Electric Power |
OH |
| Anoka Electric Cooperative |
MN |
| Badger Meter, Inc. |
WI |
| Centerior Energy |
OH |
| Central Illinois Light Co. |
IL |
| Cincinnati Gas & Electric |
OH |
| Cincinnati Water Works |
OH |
| Citizens Gas & Coke Utility |
IN |
| City of Cleveland |
OH |
| City of Columbus Utilities |
OH |
| City of Duluth Dept. of Water & Gas |
MN |
| City of Mishawaka, IN |
IN |
| City Public Service |
IL |
| City Water Light & Power |
IL |
| Cleveland Elec Illuminating |
OH |
| ComEd |
IL |
| Connexus Energy |
MN |
| Consolidated Paper, Inc. |
WI |
| Consumers Power Company |
MI |
| Dayton Power & Light |
OH |
| Detroit Edison |
MI |
| East Ohio Gas Company |
OH |
| Fieldtech, Inc. |
WI |
| First Energy |
OH |
| IES Utilities |
IA |
| Illinois Power Company |
IL |
| Indiana Gas Company |
IN |
| Indianapolis Power & Light |
IN |
| Interstate Power Company |
IA |
| Iowa Southern Utilities |
IA |
| Iowa-Illinois Gas & Electric |
IA |
| Lansing Board of Water & Light |
MI |
| Madison Gas & Electric Co. |
WI |
| Michigan Gas Utilities Co. |
MI |
| Mid-American Energy |
IA |
| New Ulm Public Utilities |
MN |
| NICOR Gas |
IL |
| North Central Public Service |
MI |
| Northern Indiana Public Service |
IN |
| Northern Minnesota Utilities |
MN |
| Northern States Power Company |
MN |
| Ohio Edison Company |
OH |
| Otter Tail Power Company |
MN |
| Pieper Electric |
WI |
| Peoples Gas Light & Coke Co. |
IL |
| Public Service of Indiana |
IN |
| Reliant Energy Minnegasco |
MN |
| RMR Services, Inc. |
MN |
| TAD Technical Services |
IL |
| Toledo Water Division Meter Shop |
OH |
| Wisconsin Electric Power Co. |
WI |
| Wisconsin Natural Gas Company |
WI |
| Wisconsin Power & Light |
WI |
