221111 — Hydroelectric Power Generation
Description
This U.S. industry comprises establishments primarily engaged in operating hydroelectric power generation facilities. These facilities use water power to drive a turbine and produce electric energy. The electric energy produced in these establishments is provided to electric power transmission systems or to electric power distribution systems.
Overview Facts
| NAICS Code | 221111 |
|---|---|
| Industry Title | Hydroelectric Power Generation |
| SBA Size Standard | 750 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→NAICS1997:221111→2002:221111→2007:221111→2012:221111→2017:221111→2022:221111)
- SIC 4931 - Electric and Other Services Combined (via SIC1987:4931→NAICS1997:221111→2002:221111→2007:221111→2012:221111→2017:221111→2022:221111)
- SIC 4939 - Combination Utilities, NEC (via SIC1987:4939→NAICS1997:221111→2002:221111→2007:221111→2012:221111→2017:221111→2022:221111)
Related Resources & Compliance Guides
Further regulatory reference links for NAICS code 221111:
- 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 221111 a valid 2022 NAICS code?
NAICS 221111 is 'Hydroelectric Power Generation', a 2022 U.S. national industry under Sector 22 (Utilities); the SBA small-business size standard is 750 employees.
What is the SBA size standard for NAICS 221111?
The SBA small business size standard for NAICS 221111 is 750 employees (based on employees).
What is the legacy SIC code mapping for 221111?
NAICS code 221111 maps to the legacy 1987 SIC codes: 4911 - Electric Services, 4931 - Electric and Other Services Combined, 4939 - Combination Utilities, NEC.