NAICS 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 voltage) the transmission of electricity from the generating source to distribution centers or other electric utilities. The transmission system includes lines and transformer stations.

The data published with NAICS code 221121 are comprised of these parts of the following SIC industries:

4911 (pt) Electric services (electric power transmission and control)
4931 (pt) Electric and other services combined (electric power transmission)
4939 (pt) Combination utilities nec (electric power transmission)

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