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- MFA Propane
- Mac County Gas, Inc.
- Madison Electric Utility
- Madison Electric Works Dept.
- Madison Gas & Electric Co.
- Madison, City of
- Madisonville Gas System
- Madisonville, Town of
- Magnolia Electric Power Association
- Maiden Electric Utility
- Maine Public Service Co.
- Malden Board of Public Works
- Mamou, Town of
- Manchester Natural Gas System
- Manitoba Hydro-Electric Board
- Manitou Light Dept.
- Manitowoc Public Utilities
- Manley Utility Co., Inc.
- Mannford Electric & Gas Dept.
- Manokotak Electric Dept.
- Mansfield Electric Dept.
- Manti Light & Power Co.
- Maplesville Water & Gas Board
- Marathon Lighting Plant
- Marianna, City of
- Maricopa County Water Conservation Distr
- Marietta, City of
- Marion Natural Gas System
- Markham Gas Corp.
- Marlow Light & Water Dept.
- Marshall Board of Public Works
- Marshall City Water & Electric Works
- Marshall County R.E.M.C.
- Marshall Water, Gas & Light Dept.
- Marshfield Electric & Water Dept.
- Martin, City of
- Martinsville Gas Dept.
- Mason Natural Gas System
- Massena Electric Dept.
- Matinicus Plantation Electric Co.
- Maui Electric Co., Ltd.
- Maury City Gas Dept.
- Mayville Electric Dept.
- Mazomanie Light & Water Dept.
- McCleary Light & Power Dept.
- McCook Public Power District
- McCormick Commission of Public Works
- McLean, City of
- McMinnville Electric System
- McMinnville Water & Light
- McMullen Valley Water C & D District
- McPherson Board Public Utilities
- Meadow Town Corp.
- Meigs, City of
- Melville, Town of
- Memphis Light, Gas & Water Division
- Menasha Electric & Water Utilities
- Mendon Board of Public Affairs
- Merced Irrigation District
- Mercury News
- Merrillan Electric Light & Water Dept.
- Metlakatla Power & Light
- Metropolis City Utilities
- Metropolitan Edison Co.
- Miami Dept. of Public Utilities
- Miami Herald
- Miami Times
- Miami-Cass County R.E.M.C.
- MidAmerican Energy Company
- MidWest Energy, Inc.
- Middle Georgia Electric Membership Corp.
- Middle Tennessee Natural Gas Utility Dis
- Middletown Electric Utility
- Midvale Irrigation District
- Midwest Electric, Inc.
- Midwest Natural Gas Corp.
- Midwest Natural Gas, Inc.
- Mifflinburg Borough Electric Dept.
- Mike Little Gas Co., Inc.
- Milan Dept. of Public Utilities
- Milford Electric Dept.
- Millen Natural Gas Dept.
- Millenium Digital Media
- Milltown Electric Dept.
- Milwaukee Journal
- Minco Gas Authority
- Minden Utilities System
- Minneapolis Star Tribune
- Minnesota Power Inc
- Minster Utilities Dept.
- Mississippi Gas Corp.
- Mississippi Power Co.
- Missouri Gas Energy
- Missouri Public Service Co.
- Mitchell County Utility Co.
- Mitchell Electric Membership Corp.
- Modern Electric Water Co.
- Modesto Irrigation District
- Monett Light & Water Dept.
- Monongahela Power Co.
- Monroe City Electric Light Dept.
- Monroe City Utilities
- Monroe County Electric Power Association
- Monroe Electric & Gas Utility
- Monroe Water, Light & Gas Commission
- Monroeville Electric Dept.
- Mont Alto Lighting System
- Monteagle Public Utility Board
- Montezuma Electric, Gas & Water Utility
- Montgomery City Gas Co.
- Montgomery Gas System
- Monticello Electric Plant Board
- Monticello, City of
- Moon Lake Electric Association, Inc.
- Moorhead Public Service Dept.
- Moose Lake Water & Light Commission
- Moreauville, Village of
- Morehead Utility Plant Board
- Morenci Water & Electric Co.
- Morgan City Water, Gas & Electric
- Morgan County Rural Electric Association
- Morganfield, City of
- Morganton Electric Utility
- Morgantown Natural Gas System
- Morristown Power System
- Morrisville Water & Light Dept.
- Morse Utility, Inc.
- Morton, Village of
- Moss Point Gas System
- Moulton Gas Dept.
- Moultrie Water, Gas & Light
- Mount Carmel Public Utility Co.
- Mount Horeb Electric Utility
- Mount Olympus Spring Water
- Mount Pleasant Gas System
- Mount Pleasant Power & Gas Systems
- Mount Pleasant Utilities
- Mount Vernon Water & Electric System
- Mount Vernon Water & Gas System
- Mount Wheeler Power, Inc.
- Mountain Iron Light & Water Dept.
- Mountain Parks Electric, Inc.
- Mountain Utilities, Inc.
- Mountain View, City of
- Mountainair, Town of
- Mulberry City Utilities
- Munford, City of
- Murphy Gas, Inc.
- Murray Electric & Natural Gas Systems
- Muscle Shoals Electric Board
- Muscotah Electric Dept.
- Muskegon Chronicle