221121 — Electric Bulk Power Transmission and Control
Description
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.
Exclusions & Cross-References
- 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.
Overview Facts
| NAICS Code | 221121 |
|---|---|
| Industry Title | Electric Bulk Power Transmission and Control |
| SBA Size Standard | 950 employees |
| IRS PBA Code | 221100 (rolled-up match) |
| Sectors Hierarchy | Sector 22 → 221 → 2211 |
| Source / Verified | US Census 2022 NAICS Manual / 2026-06-28 |
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 4911 - Electric Services (via SIC1987:4911→NAICS1997:221121→2002:221121→2007:221121→2012:221121→2017:221121→2022:221121)
- SIC 4931 - Electric and Other Services Combined (via SIC1987:4931→NAICS1997:221121→2002:221121→2007:221121→2012:221121→2017:221121→2022:221121)
- SIC 4939 - Combination Utilities, NEC (via SIC1987:4939→NAICS1997:221121→2002:221121→2007:221121→2012:221121→2017:221121→2022:221121)
Related Resources & Compliance Guides
Further regulatory reference links for NAICS code 221121:
- Sector 22 Directory Hub — List of related industries in the Utilities sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.
Related Industries in 2211
Frequently Asked Questions (FAQ)
Is 221121 a valid 2022 NAICS code?
NAICS 221121 is 'Electric Bulk Power Transmission and Control', a 2022 U.S. national industry under Sector 22 (Utilities); the SBA small-business size standard is 950 employees.
What is the SBA size standard for NAICS 221121?
The SBA small business size standard for NAICS 221121 is 950 employees (based on employees).
What is the legacy SIC code mapping for 221121?
NAICS code 221121 maps to the legacy 1987 SIC codes: 4911 - Electric Services, 4931 - Electric and Other Services Combined, 4939 - Combination Utilities, NEC.