NAICS 333611 Quarterly Industry Report
Turbine and Turbine Generator Set Units Manufacturing
Comprehensive industry research for valuation professionals, business owners, buyers, and lenders
NAICS Code: 333611Sector: 33Updated: Q1 2026
About This Report
This Fair Market Value industry report covers NAICS 333611 (Turbine and Turbine Generator Set Units Manufacturing) using the 2022 North American Industry Classification System. Data sources include the U.S. Census Bureau[5] NAICS classification, Bureau of Labor Statistics[6] manufacturing employment data, and SBA size standard tables. Content addresses industry structure, product scope, and market dynamics for this specialized heavy equipment manufacturing sector.
Industry Snapshot
Key metrics for the turbine and turbine generator set units manufacturing industry.
Industry Definition & Overview
Turbine and Turbine Generator Set Units Manufacturing (NAICS 333611) encompasses establishments primarily engaged in manufacturing steam turbines, gas turbines, hydraulic turbines, and complete turbine generator set units for power generation and industrial applications. Products include utility-scale steam turbine generators, industrial gas turbine generator sets, hydroelectric turbines, wind turbine nacelle assemblies, and turbine parts including rotors, blades, nozzles, and casings. Per the Census Bureau[5], this classification covers complete rotating equipment systems that convert thermal, kinetic, or fluid energy into mechanical power and electrical generation.
Manufacturing processes demand extreme precision in large-scale component production. Turbine blade manufacturing involves investment casting of nickel-based superalloys, five-axis CNC machining, and thermal barrier coating application. Rotor assembly requires dynamic balancing to micro-gram tolerances at operating speeds exceeding 3,600 RPM. Casing fabrication uses heavy steel plate welding with radiographic inspection to ASME standards. Workforce requirements include metallurgists, rotating equipment engineers, precision machinists, and certified welders who work with exotic alloys under demanding quality specifications.
Geographic distribution concentrates in regions with established heavy manufacturing infrastructure and engineering talent. Facilities cluster in the Southeast, Northeast, and Texas near power generation customers and industrial energy markets. According to BLS data[6], manufacturing employment distributes across states with turbine engineering and heavy fabrication capabilities. Product lifecycles span decades, with turbines operating thirty to fifty years through periodic overhaul and component replacement programs.
What's Included in This Industry
- Steam turbines and steam turbine generator sets
- Gas turbines and gas turbine generator sets
- Hydraulic turbines for hydroelectric applications
- Wind turbine nacelle assemblies and components
- Turbine rotors, blades, and nozzle assemblies
- Turbine casings and exhaust components
- Turbine governors and control systems
- Turbine parts and replacement components
- Turbine generator set assembly and testing
- Combined cycle equipment packages
NAICS Classification Hierarchy
| Level | Description | Code |
|---|---|---|
| Subsector | Machinery Manufacturing | 333 |
| Industry Group | Engine, Turbine, and Power Transmission Equipment Manufacturing | 3336 |
| NAICS Industry | Engine, Turbine, and Power Transmission Equipment Manufacturing | 33361 |
| National Industry | Turbine and Turbine Generator Set Units Manufacturing | 333611 |
Related NAICS Codes
| Code | Description | Relationship |
|---|---|---|
| 333612 | Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing | Manufactures speed changers, gearboxes, and industrial drives that transmit mechanical power from turbines to generators and auxiliary equipment as essential power transmission components |
| 333613 | Mechanical Power Transmission Equipment Manufacturing | Produces mechanical power transmission equipment including bearings, couplings, and shaft assemblies integrated into turbine generator installations as rotating element support components |
| 333618 | Other Engine Equipment Manufacturing | Manufactures other engine equipment including governors and speed controls that regulate turbine operation, sharing engine and rotating equipment manufacturing expertise |
| 335312 | Motor and Generator Manufacturing | Produces standalone motors and generators manufactured separately from turbine integration, while NAICS 333611 covers complete turbine-generator systems assembled as integrated units |
| 332410 | Power Boiler and Heat Exchanger Manufacturing | Manufactures power boilers and heat exchangers that generate steam driving turbine generators, representing a critical upstream equipment supplier for steam-based power generation systems |
| 332111 | Iron and Steel Forging | Produces iron and steel forgings including turbine rotor forgings, shaft forgings, and disk forgings that require specialized open-die and closed-die forging capabilities for critical rotating components |
Geographic Concentration
Top states by share of national establishments.
| # | State | % Est. | Total Est. |
|---|---|---|---|
| 1 | California | 10.9% | 21 |
| 2 | Texas | 10.9% | 21 |
| 3 | Pennsylvania | 7.8% | 15 |
| 4 | New York | 6.3% | 12 |
| 5 | Ohio | 5.7% | 11 |
| 6 | Florida | 5.2% | 10 |
| 7 | Connecticut | 4.7% | 9 |
| 8 | North Carolina | 4.2% | 8 |
| 9 | Michigan | 3.6% | 7 |
| 10 | South Carolina | 3.6% | 7 |
% Of Establishments
0%
11%
Source: County Business Patterns, U.S. Census Bureau[3]
SBA Lending Summary
16
Total SBA Loans
$6.4M
Total Loan Volume
$400K
Average Loan Size
7 yrs
Average Loan Term
8.75%
Average Interest Rate
16
Jobs Supported
Source: SBA 7(a) Program Data, U.S. Small Business Administration — FY 2025[4]
Key Insight: The Small Business Administration[7] sets the size standard for NAICS 333611 at 1,500 employees. Firms averaging 1,500 or fewer employees over the preceding 12 months qualify as small businesses for SBA loan programs, federal contracting set-asides, and small business certifications. This elevated threshold reflects the extreme capital intensity and engineering complexity of turbine manufacturing, where specialized foundry, machining, and testing facilities characterize competitive operations. Eligible businesses can access SBA 7(a) loans[8] for working capital, equipment, and acquisition financing, while 504 loans[9] support major fixed-asset purchases including real estate and heavy machinery.
Top SBA Lenders
| # | Lender | Loans | Volume | Avg Loan |
|---|---|---|---|---|
| 1 | First United Bank and Trust Company | 8 | $4.0M | $500K |
| 2 | PNC Bank, National Association | 8 | $2.4M | $300K |
Frequently Asked Questions
Common questions about this industry.
What types of businesses are classified under NAICS 333611?
NAICS 333611 classifies establishments primarily engaged in manufacturing turbines and complete turbine generator sets for power generation. Products include steam turbines, gas turbines, hydraulic turbines, and wind turbine components. The Census Bureau[5] distinguishes this from standalone generators (NAICS 335312) and other engine equipment (NAICS 333618).
How is the turbine manufacturing industry structured?
A small number of large multinational corporations dominate utility-scale turbine markets through extensive engineering capabilities, global service networks, and installed base relationships. These firms manufacture gas turbines, steam turbines, and generators for power plants worldwide. Smaller manufacturers produce specialty turbines, components, and aftermarket parts for specific applications.
What is the SBA size standard for turbine manufacturers?
The SBA sets the size standard at 1,500 employees for NAICS 333611. Firms at or below this threshold qualify as small businesses for federal contracting preferences and SBA lending programs. Details appear in the SBA size standards table[7].
What NAICS codes are closely related to turbine manufacturing?
NAICS 333612 covers gearboxes and speed changers used in turbine systems. NAICS 333618 covers other engine equipment including governors. Many 335312 covers standalone generators. NAICS 332410 covers power boilers driving steam turbines. These adjacent codes reflect the integrated power generation equipment supply chain.
What industries depend on turbine manufacturers?
Electric utilities purchase turbine generators for baseload and peaking power plants. Industrial facilities invest in cogeneration systems for combined heat and power. Per BLS data[6], energy sector employment depends on turbine equipment for power generation across natural gas, steam, hydroelectric, and wind applications.
What activities does NAICS 333611 include?
Covered products include steam turbines, gas turbines, hydraulic turbines, wind turbine nacelles, turbine generator sets, rotors, blades, casings, and governors. Manufacturing activities span superalloy casting, five-axis machining, rotor balancing, and system assembly with performance testing. Excluded items include standalone generators (NAICS 335312), internal combustion engines (NAICS 333618), and aircraft engines (NAICS 336412).
Are turbine manufacturers eligible for SBA loans?
Yes, manufacturers meeting the 1,500-employee threshold qualify for SBA 7(a) loans, 504 loans, and federal contracting set-asides. The SBA funding programs[10] page details eligibility for manufacturing businesses seeking capital for foundry equipment, machining centers, and testing facilities.
Where is turbine manufacturing concentrated in the United States?
South Carolina, New York, and Texas host major turbine manufacturing facilities operated by large multinational equipment producers. Additional manufacturing operations exist in Pennsylvania and Virginia. According to BLS employment data[6], engine and turbine manufacturing employment concentrates in states with heavy manufacturing infrastructure, engineering talent, and proximity to power generation customers.
Sources & References
Government datasets and editorial sources used in this report.
- [1]U.S. Bureau of Labor Statistics, Quarterly Census of Employment and Wages bls.gov
- [2]U.S. Census Bureau, Economic Census census.gov
- [3]U.S. Census Bureau, County Business Patterns census.gov
- [4]U.S. Small Business Administration, SBA 7(a) Loan Program Data data.sba.gov
- [5]Census Bureau census.gov
- [6]BLS data bls.gov
- [7]Small Business Administration sba.gov
- [8]SBA 7(a) loans sba.gov
- [9]504 loans sba.gov
- [10]SBA funding programs sba.gov
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