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Transmission system operator

entity entrusted with transporting energy in the form of natural gas or electrical power on a national or regional level using fixed infrastructure

Pronunciation
/transˈmɪʃən ˈsɪstəm ˈɒpəreɪtə/
/trænzˈmɪʃən ˈsɪstəm ˈɑpəˌreɪdər/