NAICS Code Description

221121 - Electric Bulk Power Transmission and Control

*Click to View Top Businesses by Revenue for 221121 – Complete Profiles*.

This U.S. industry comprises establishments primarily engaged in operating electric power transmission systems and/or controlling (i.e., regulating voltages) the transmission of electricity from the generating source to distribution centers or other electric utilities. The transmission system includes lines and transformer stations.

Cross-References. Establishments primarily engaged in--

  • Generating electric energy--are classified in Industry 22111, Electric Power Generation; and
  • Distributing electricity to final consumers--are classified in U.S. Industry 221122, Electric Power Distribution.
2007
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2012
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2017
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Index Entries for 221121
221121221121221121Electric power control
221121221121221121Electric power transmission systems
221121221121221121Transmission of electric power

Top Businesses by Annual Sales for 221121 – Click for Complete Profiles:

National Grid USAWalthamMA
Calpine CorporationHoustonTX
Itc Investment Holdings IncNoviMI
Itc Holdings CorpNoviMI
Potomac Edison CompanyWilliamsportMD
Central Maine Power CompanyAugustaME
American Transmission Co LLCWaukeshaWI
Southern Maryland Elc Coop IncHughesvilleMD
Itc Midwest LLCCedar RapidsIA
Bhe Holdings IncBangorME