250 corporate representatives in 13 countries belong to the Nuclear Energy Institute. Member firms include nuclear power plant owners, engineering and design companies, fuel supply vendors and service firms, companies that work in nuclear medicine, research and industrial application, radiopharmaceutical and radionuclide business, research laboratories including universities, and labor unions. NEI programs and activities regularly have more than 6000 industry professional participants.

Washington DC is the headquarters of NEI. It has a staff of 132. The nuclear energy industry that these folks and NEI members represent and serve cover the gamut of nuclear related industries such as nuclear medicine, commercial generation of electricity, therapy and diagnostics, agriculture and food processing, manufacturing and other industrial uses, uranium mines, the manufacture of nuclear fuel and the management of nuclear waste.