«Control Area Concepts and Obligations». North American Electric Reliability Council, 01-07-1992. Arxivat de l'original el 2 de gener 2011. [Consulta: 18 juliol 2011]. «Today, in NERC, there are four major interconnected areas: the Eastern Interconnection, the Western Interconnection, the Texas Interconnection, and the Québec Interconnection.»
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«Control Area Concepts and Obligations». North American Electric Reliability Council, 01-07-1992. Arxivat de l'original el 2 de gener 2011. [Consulta: 18 juliol 2011]. «Today, in NERC, there are four major interconnected areas: the Eastern Interconnection, the Western Interconnection, the Texas Interconnection, and the Québec Interconnection.»
