Top 15 Solar EPC Companies in USA (2026): Utility-Scale Leaders
The United States continues to expand its utility-scale solar capacity as developers invest in clean energy projects across multiple states. Behind every successful solar farm is an experienced engineering, procurement, and construction (EPC) contractor responsible for transforming project designs into operational power plants.
Choosing among the leading Solar EPC Companies in USA requires more than comparing company size. Project execution history, engineering expertise, supply chain management, commissioning capabilities, and experience with large utility-scale projects all influence project success.
Table of Contents
Table of Contents
This guide evaluates the industry’s leading EPC contractors based on real project experience, installed capacity, market presence, and recent developments. Whether you are a utility, independent power producer (IPP), investor, or project developer, this comparison provides a practical overview of the companies leading America’s large-scale solar market.
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How We Evaluated These Solar EPC Companies
As an Electrical Engineer with over 15 years of experience in industrial power systems and renewable energy MW-scale projects, I believe evaluating EPC contractors requires looking beyond marketing claims.
For this list, I reviewed several technical and commercial factors commonly considered during EPC prequalification and contractor selection.
The evaluation criteria included:
| Evaluation Criteria | Why It Matters |
|---|---|
| Installed Solar Capacity (GW) | Demonstrates proven delivery capability |
| Utility-Scale Project Experience | Indicates ability to execute large solar farms |
| Years in Operation | Reflects organizational stability |
| Geographic Coverage | Shows capability across different U.S. regions |
| Engineering Expertise | Ensures compliance with utility requirements |
| Notable Completed Projects | Validates real-world experience |
| Recent Business Expansion | Indicates financial strength and continued growth |
| Safety & Execution Record | Important for schedule and project reliability |
I also considered publicly available information regarding completed utility projects, major acquisitions, recent EPC contracts, and operational experience through 2025 to provide a practical industry perspective rather than a simple alphabetical company list.
Although no EPC contractor is perfect for every project, companies with strong engineering teams, reliable procurement networks, experienced construction management, and a proven commissioning history generally provide lower project risk.
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Top Solar EPC Companies in USA | Quick Comparison Table
| Company | Founded / HQ | Installed Capacity (Approx.) | Project Focus | Notable Project |
|---|---|---|---|---|
| SOLV Energy | 2008 / California | 20+ GW | Utility | Gemini Solar Project |
| Blattner Energy | 1907 / Minnesota | 30+ GW Renewable Projects | Utility | Numerous utility solar installations |
| Primoris Renewable Energy | Texas | 25+ GW | Utility | Large U.S. solar portfolio |
| McCarthy Building Companies | 1864 / Missouri | 10+ GW | Utility & C&I | Danish Fields Solar |
| Rosendin Electric | 1919 / California | 8+ GW | Utility & Commercial | Crimson Solar Project |
| Burns & McDonnell | 1898 / Missouri | Multiple GW | Utility | Numerous EPC utility projects |
| Black & Veatch | 1915 / Kansas | Global Utility EPC | Utility | Utility-scale PV developments |
| Mortenson | 1954 / Minnesota | 8+ GW | Utility | Solar Star support projects |
| Moss Construction | Florida | 5+ GW | Utility | Texas utility projects |
| Signal Energy | Tennessee | 10+ GW | Utility | Utility PV developments |
| RES (Renewable Energy Systems) | Global / Colorado | 24+ GW Worldwide | Utility | Various U.S. solar farms |
| DEPCOM Power | Arizona | 10+ GW | Utility | Large Southwest portfolio |
| Cupertino Electric | California | Multi-GW | Utility & Commercial | California solar facilities |
| IEA Constructors (MasTec Renewables) | Texas | 30+ GW Renewable | Utility | Large EPC renewable portfolio |
| Wanzek Construction (MasTec) | North Dakota | Multi-GW | Utility | Wind and solar EPC projects |
Company Profiles
1. SOLV Energy
SOLV Energy consistently ranks among the largest Solar EPC Companies in USA for utility-scale solar development. The company specializes in engineering, procurement, construction, commissioning, and long-term operations and maintenance.
Its portfolio exceeds 20 GW of completed solar projects across North America. One of its most recognized projects is the 690 MW Gemini Solar Project in Nevada, among the largest solar installations in the United States.
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In June 2025, SOLV Energy expanded its infrastructure capabilities through the acquisition of Spartan Infrastructure, strengthening civil construction services for renewable energy developments.
Key strengths include:
- Utility-scale EPC expertise
- Strong O&M capabilities
- Battery energy storage integration
- Nationwide project execution
2. Blattner Energy
Blattner Energy has more than a century of construction experience and has become one of America’s largest renewable EPC contractors.
The company has participated in renewable projects totaling more than 30 GW, including numerous utility-scale photovoltaic installations across Texas, the Midwest, and the Southwest.
Its reputation is built on complex project execution, heavy civil construction, and excellent safety performance.
Major strengths include:
- Large workforce
- Strong utility-scale experience
- Proven construction management
- Extensive renewable portfolio
3. Primoris Renewable Energy
Primoris Renewable Energy has delivered utility-scale solar facilities across the United States and continues expanding its renewable construction business.
Its completed renewable portfolio exceeds 25 GW, including solar and battery storage projects. The company is known for self-performing critical construction activities, allowing better schedule control.
Recent expansion into energy storage has strengthened its position as a full-service renewable EPC provider.
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4. McCarthy Building Companies
McCarthy Building Companies combines traditional construction expertise with renewable energy engineering.
The company has completed over 10 GW of utility and commercial solar projects throughout North America.
A notable project includes the Danish Fields Solar Project in Texas, which added hundreds of megawatts of renewable generation capacity.
McCarthy is particularly recognized for:
- Engineering excellence
- Integrated project delivery
- Utility interconnection coordination
- High safety standards
5. Rosendin Electric
Rosendin has grown into one of the largest employee-owned electrical contractors in the United States.
The company has contributed to more than 8 GW of solar installations while providing electrical engineering, substation construction, commissioning, and grid integration services.
Rosendin played a major role in the Crimson Solar Project in California, supporting utility-scale clean energy expansion.
Its expertise includes:
- High-voltage electrical systems
- Transmission integration
- Utility substations
- Renewable electrical infrastructure
6. Burns & McDonnell
Burns & McDonnell offers full EPC services across the power generation sector, including utility-scale photovoltaic facilities.
Founded in 1898, the company has decades of experience delivering complex energy infrastructure projects. Its multidisciplinary engineering teams support every phase from feasibility studies to final commissioning.
The firm is particularly respected for transmission engineering, grid studies, environmental permitting, and owner’s engineering services.
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7. Black & Veatch
Black & Veatch is one of the world’s most recognized engineering firms serving utilities and independent power producers.
The company has delivered numerous utility-scale solar EPC projects while also supporting transmission upgrades, battery storage integration, and grid modernization.
Its engineering capabilities make it a preferred partner for technically challenging renewable developments.
Key advantages include:
- Global engineering expertise
- Utility transmission experience
- Energy storage integration
- Advanced power system studies
8. Mortenson
Mortenson has become a leading renewable construction contractor with more than 8 GW of completed solar projects across the United States.
The company has supported several landmark utility-scale developments, including work associated with California’s Solar Star projects and numerous Midwest installations.
Mortenson emphasizes digital construction management, safety innovation, and efficient project scheduling, making it a trusted EPC partner for large solar farms.
Its growing experience with battery energy storage systems further strengthens its position in the rapidly evolving renewable energy market.
Company Profiles
9. Moss Construction
Moss Construction has established itself as one of the leading renewable energy contractors in North America. While the company has extensive commercial construction experience, its renewable energy division has completed more than 5 GW of utility-scale solar projects across several U.S. states.
The company has delivered large photovoltaic facilities in Texas, Florida, and the Southwest, working with independent power producers, utilities, and energy developers. Moss is recognized for maintaining strict construction schedules while meeting demanding utility commissioning requirements.
Key strengths include:
- Utility-scale solar EPC services
- Civil and structural construction expertise
- Experienced project management teams
- Strong safety culture
10. Signal Energy
Signal Energy specializes in engineering, procurement, and construction services for utility-scale renewable energy projects. The company has successfully completed more than 10 GW of solar generation projects throughout North America.
Signal Energy is known for designing highly efficient construction workflows that reduce installation time while maintaining quality standards. The company continues expanding its battery energy storage capabilities to support hybrid renewable energy facilities.
Its services include:
- EPC project delivery
- High-voltage substation construction
- Grid interconnection support
- Battery storage integration
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11. RES (Renewable Energy Systems)
RES is one of the world’s largest renewable energy companies, with over 24 GW of renewable generation projects delivered globally. In the United States, the company provides complete EPC services for utility-scale solar farms, wind projects, and energy storage facilities.
RES also offers long-term operations and maintenance services, allowing project owners to manage assets throughout their operational life. Its engineering expertise extends from project development through commissioning and asset optimization.
Notable capabilities include:
- Utility-scale engineering
- Renewable asset management
- Transmission coordination
- Long-term operations and maintenance
12. DEPCOM Power
DEPCOM Power has rapidly become one of the fastest-growing Solar EPC Companies in USA by focusing exclusively on utility-scale photovoltaic and battery storage projects.
The Arizona-based company has delivered more than 10 GW of utility-scale solar installations across North America. DEPCOM is also recognized for providing lifecycle services that include operations, maintenance, performance optimization, and asset management.
Its portfolio includes numerous large solar developments throughout Arizona, Nevada, Texas, and California.
Major advantages include:
- Utility-scale EPC specialization
- Battery energy storage expertise
- Performance optimization services
- Nationwide construction capabilities
13. Cupertino Electric
Founded in 1954, Cupertino Electric has decades of experience delivering complex electrical infrastructure projects. The company has expanded its renewable energy business significantly, completing multi-gigawatt solar installations across the United States.
Cupertino Electric has participated in several large California utility-scale photovoltaic developments while also supporting commercial solar infrastructure for major technology companies.
The firm’s engineering teams are well known for:
- Electrical balance of plant (EBOP)
- Utility interconnection
- High-voltage systems
- Renewable engineering services
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14. IEA Constructors (MasTec Renewables)
Following its acquisition by MasTec, IEA Constructors became part of one of North America’s largest infrastructure construction organizations.
The combined renewable portfolio exceeds 30 GW across solar, wind, battery storage, and transmission projects. IEA Constructors continues delivering utility-scale photovoltaic facilities throughout Texas, the Midwest, and the western United States.
The company’s integrated engineering and construction model allows efficient execution of large renewable energy developments.
Highlights include:
- Large renewable construction fleet
- Extensive heavy civil expertise
- Utility-scale transmission experience
- Nationwide project delivery
15. Wanzek Construction (MasTec)
Wanzek Construction, now operating within MasTec’s renewable energy business, has earned a strong reputation for constructing utility-scale wind and solar facilities.
The company has participated in numerous large renewable projects across the United States and continues supporting developers with engineering, civil construction, electrical installation, and commissioning services.
Its experienced workforce and access to MasTec’s national resources enable Wanzek to deliver complex projects efficiently while maintaining high safety standards.
Core strengths include:
- Renewable construction expertise
- Transmission infrastructure
- Utility-scale project execution
- Experienced field workforce
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What to Look for in a Utility-Scale Solar EPC Partner
Selecting the right EPC contractor can determine whether a solar project finishes on schedule and within budget. While cost remains important, utility-scale developments require evaluating technical capability, financial stability, and long-term support.
Consider these factors before selecting an EPC partner:
| Evaluation Factor | Why It Matters |
|---|---|
| Utility-scale experience | Reduces execution risk on large projects |
| Installed project capacity | Demonstrates proven delivery capability |
| Engineering resources | Ensures optimized system design |
| Procurement network | Minimizes equipment delays |
| Financial strength | Supports warranty obligations and project guarantees |
| Grid interconnection expertise | Helps navigate utility approval processes |
| Safety performance | Reduces construction risk and downtime |
| O&M services | Provides long-term asset support |
Developers should also review previous projects with similar capacities. An EPC contractor experienced in 500 MW utility-scale solar farms is generally better equipped to manage complex logistics than one focused primarily on commercial rooftop installations.
Strong balance sheets are equally important. Utility-scale projects often involve multi-year warranty commitments, performance guarantees, and significant contractual obligations. Working with financially stable contractors reduces long-term project risk.
Another important consideration is interconnection expertise. Coordinating with transmission operators, utilities, and regulatory agencies requires specialized engineering knowledge that not every contractor possesses.
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Solar EPC vs. Commercial Solar vs. Residential Installation — Which Do You Need?
Although these services all involve solar energy systems, they serve different markets and project sizes.
| Category | Typical Project Size | Typical Customer | Primary Focus |
|---|---|---|---|
| Utility-Scale Solar EPC | 20 MW to 1 GW+ | Utilities, IPPs, Developers | Engineering, Procurement, Construction |
| Commercial Solar | 50 kW to 10 MW | Businesses, Factories, Institutions | Energy savings and operational efficiency |
| Residential Solar | 3 kW to 25 kW | Homeowners | Rooftop electricity generation |
Utility-scale EPC contractors manage every stage of large power plant construction, including engineering design, equipment procurement, civil works, transmission connections, commissioning, and performance testing.
Commercial solar contractors typically design and install systems for offices, manufacturing facilities, schools, hospitals, warehouses, and shopping centers where reducing electricity costs is the primary objective.
Residential solar installers focus on rooftop photovoltaic systems for homeowners, offering system design, permitting, installation, and after-sales support.
If your project involves a large solar farm supplying electricity directly to the transmission grid, this guide to Solar EPC Companies in USA is the appropriate resource. For smaller commercial or residential projects, dedicated contractor comparisons provide more relevant information.
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Frequently Asked Questions
What is a solar EPC company?
A solar EPC company provides complete engineering, procurement, and construction services for solar power projects. Their responsibilities typically include system design, equipment sourcing, civil construction, electrical installation, commissioning, and project handover.
What’s the difference between a solar EPC company and a solar installer?
A solar EPC company manages the entire lifecycle of large solar projects, often including engineering design, procurement, project management, transmission interconnection, and commissioning. A solar installer generally focuses on installing photovoltaic systems for residential or commercial customers.
How much installed capacity should a utility-scale EPC partner have?
There is no fixed requirement, but developers generally prefer EPC contractors with several gigawatts of successfully completed utility-scale projects. A strong project portfolio demonstrates proven engineering capability, construction experience, and the ability to deliver large renewable energy developments reliably.
Conclusion
The U.S. renewable energy sector continues to experience rapid growth, increasing demand for experienced engineering, procurement, and construction partners capable of delivering complex utility-scale solar projects. The leading Solar EPC Companies in USA have demonstrated their expertise through gigawatts of installed capacity, successful project execution, and continued investment in engineering innovation, battery storage, and grid integration.
While companies such as SOLV Energy, Blattner Energy, Primoris Renewable Energy, DEPCOM Power, Burns & McDonnell, Black & Veatch, and MasTec Renewables consistently rank among industry leaders, the best EPC partner ultimately depends on your project’s size, location, interconnection requirements, financing structure, and long-term operational goals.
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