- N2O—nitrous oxide
- NAAQS—National Ambient Air Quality Standards (US)
- NAESB—North American Energy Standards Board (formerly GISB)
- NAFTA—North American Free Trade Agreement
- NAICS—North American Industry Classification System
- NAP—National Action Plan
- NARUC—National Association of Regulatory Utility Commissioners (US)
- NAS—United States National Academy of Sciences
- NASPI—North American Synchrophasor Initiative
- NASUCA—National Association of Utility Consumer Advocates(US)
- NATC—Non Recallable Available Transfer Capability
- NBS—National Bureau of Standards (US)
- NCD—Non coincidental Demand
- NCEP—National Council on Electricity Policy (US)
- NCSL—National Conference of State Legislatures (US)
- NEA—The National Energy Act of 1978 (US)
- NEB—National Energy Board (Canada)
- NEDRI—New England Distributed Resources Initiative (US)
- NEPA—National Environmental Policy Act (US)
- NEPOOL—New England Power Pool
- NERC—North American Electric Reliability Council
- NGA—Natural Gas Act (US)
- NGAA—Natural Gasoline Association of America (US)
- NGL—natural gas liquids
- NGPA—Natural Gas Policy Act of 1978 (US)
- NGPL—Natural gas plant liquids
- NGPSA—Natural Gas Pipeline Safety Act of 1968 (US)
- NGSA—Natural Gas Supply Association (US)
- NGV—Natural gas vehicle
- NHPA—National Historic Preservation Act (US)
- NIETC—National Interest Electric Transmission Corridor (US)
- NITC—Normal Incremental Transfer Capability
- NIMBY—Not in my backyard regarding siting of energy generation and transmission infrastructure.
- NOAA—National Oceanic and Atmospheric Administration (US)
- NOI—Notice of Intent or Notice of Inquiry or Notice of Investigation
- NOPR—Notice of Proposed Rulemaking (US)
- NORDEL—association of Nordic electric system operators, comprising Denmark, Finland, Norway, Sweden
- NOx—nitrogen oxides
- NPCC—Northeast Power Coordinating Council (US)
- NPV—Net Present Value
- NRC—Nuclear Regulatory Commission (US)
- NRCS—National Resource Conservation Service (US)
- NRECA—National Association of Rural Electric Cooperatives (US)
- NREPA—National Resource and Environmental Protection Act (US)
- NRI—National Rivers Inventory (US)
- NSA—Noise sensitive area
- NTAC—Northwest Transmission Assessment Committee (US)
- NUG—Non Utility Generator
- NURE—national uranium resource evaluation (US)
- NYDER—New York Department of Environmental Resources
- NYISO—New York Independent System Operator, Inc. (US)
- NYMEX—New York Mercantile Exchange
- NYPSC—New York Public Service Commission
- NYSERDA—New York State Energy Research and Development Authority
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