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Stronghold Engineering

Stronghold Engineering, Inc.

Perris, California, United States

SolarEnergy Storage
Founded 199151-200 employees41 MW installed
Profile last updated: July 1, 2026

About

Founded in 1991, Stronghold Engineering is a renewable energy company headquartered in Perris, United States with approximately 51-200 employees specializing in Solar, Energy Storage.

Stronghold Engineering is a Southern California design-build and general contracting firm founded in 1991 as Stronghold Electric. The company provides engineering, procurement and construction (EPC) services, electrical contracting, civil and vertical construction, and renewable energy construction. Its renewable work centers on commercial and government solar PV installations, including rooftop, carport, ground-mounted and landfill systems, along with battery storage and microgrid projects. Clients include federal agencies, state and county governments, municipal water districts, universities, and commercial and industrial businesses. The company describes itself as family-owned, reports a history of installing over 41,000 kW of solar power, and holds WBENC and MBE/WBE certifications.

Headquarters

Perris, United States

Founded

1991

Employees

51-200

Focus areas

solarcommercial solarrenewable energy constructiondesign-buildgeneral contractingelectrical contractingEPCbattery storagemicrogridgovernment projects

Products & services

Business models

B2BEPC

Value chain

EngineeringProcurementConstructionO&MConsulting

Service areas (3)

  • Los Angeles and Inland Empire

    General contracting, electrical, commercial construction and commercial solar services

  • San Diego County

    Commercial solar installation and construction services

  • Southern California

    Design-build, EPC, electrical and renewable energy construction

Locations

Headquarters

W. Walnut Ave 150, 92571, Perris, California, United States

Service regions

United States

Projects

9

Naval Air Weapons Station Seal Beach Solar PV Systems

Rooftop solar PV

Design-build installation of solar PV systems on the roofs of two buildings, including roof demolition and replacement, under a fast-track federal project.

Seal Beach, United StatesClient: U.S. Navy

County of Santa Clara Solar PV Systems

Rooftop, carport and ground-mounted solar PV

Design and construction of rooftop, carport and ground-mounted solar PV systems at several county facilities as part of a multi-jurisdiction renewable energy procurement.

5 MW capacityUnited StatesClient: County of Santa Clara

Generating Green Multi-System Solar PV Project

Solar PV

Design-build construction of five PV systems for the county's Generating Green initiative.

5.6 MW capacityUnited StatesClient: County of Santa Clara

Landfill Solar PV Plant, West Riverside County

Ground-mounted solar PV on landfill

Solar PV plant on the West Riverside County Landfill with two solar fields and 9,520 panels, converting former landfill land to renewable energy generation.

3 MW capacityUnited StatesClient: County of Riverside

Eastern Municipal Water District Solar PV Systems

Ground-mounted solar PV

Prime contractor for detailed design and construction of four solar PV generating systems at four separate locations.

4 MW capacityUnited StatesClient: Eastern Municipal Water District

Old Town San Diego Solar PV System

Solar PV

Design and installation of a solar PV system in historic San Diego Old Town to support U.S. Navy energy independence.

1.3 MW capacitySan Diego, United StatesClient: U.S. Navy

Naval Base San Diego Solar PV Systems

Rooftop solar PV

Fast-track design-build installation of solar PV systems on the roofs of three buildings, including roof demolition and replacement.

San Diego, United StatesClient: U.S. Navy

University of California Riverside Photovoltaic System

Rooftop solar PV

Design, construction and installation of a photovoltaic system on two large campus buildings, preserving existing architectural characteristics.

Riverside, United StatesClient: University of California, Riverside

Tesla Battery Energy Storage System Project

Battery storage

Installation of a Tesla battery energy storage system supporting existing infrastructure and power supply.

United States

Credentials & affiliations

Certifications

WBENC Certified

Issued by: Women's Business Enterprise National Council

MBE/WBE Certified

ABC Accredited Quality Contractor

Issued by: Associated Builders and Contractors

Awards

ABC National Eagle Award

Pediatric ICU Project, Balboa Naval Medical Center

ABC SoCal Regional Excellence Award

Sierra College Rocklin Project

ABC SoCal Regional Excellence Award

University of California Riverside School of Business PV Project

Best Contractors to Work for in Construction

2023

Best Contractors to Work for in Construction

2024

ABC 2024 Top Performer

2024Four categories

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