2017 NAICS Definition

T = Canadian, Mexican, and United States industries are comparable.

221121 Electric Bulk Power Transmission and Control

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 NAICS		2012 NAICS		2017 NAICS		Corresponding Index Entries
221121		221121		221121		Electric power control
221121		221121		221121		Electric power transmission systems
221121		221121		221121		Transmission of electric power