221116 — Geothermal Electric Power Generation
Description
This U.S. industry comprises establishments primarily engaged in operating geothermal electric power generation facilities. These facilities use heat derived from the Earth to produce electric energy. The electric energy produced in these establishments is provided to electric power transmission systems or to electric power distribution systems (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Overview Facts
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→NAICS1997:221119→2002:221119→2007:221119→2012:221116→2017:221116→2022:221116)
- SIC 4931 - Electric and Other Services Combined (via SIC1987:4931→NAICS1997:221119→2002:221119→2007:221119→2012:221116→2017:221116→2022:221116)
- SIC 4939 - Combination Utilities, NEC (via SIC1987:4939→NAICS1997:221119→2002:221119→2007:221119→2012:221116→2017:221116→2022:221116)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC M1MC — OPERATION OF EPG FACILITIES - GEOTHERMAL
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 221116 valid in 2022? ▾
Yes, 221116 is a valid 6-digit 2022 NAICS national industry code representing 'Geothermal Electric Power Generation' under Sector 22 in the official classification index.
What is the SBA size standard for NAICS code 221116? ▾
The Small Business Administration (SBA) has established a small business size standard of 250 employees for NAICS code 221116 (Geothermal Electric Power Generation), calculated based on employees.
What is the legacy SIC equivalent for NAICS 221116? ▾
According to official Census Bureau concordance tables, NAICS code 221116 (Geothermal Electric Power Generation) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 4911 - Electric Services, 4931 - Electric and Other Services Combined, 4939 - Combination Utilities, NEC.
Related Pages & Tools
Further regulatory reference links for NAICS code 221116:
- 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.
- NAICS 221116 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Geothermal Electric Power Generation).
- 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.