
3 Phase Associates LLC
Chattanooga, TNElectrical Engineering and Consulting Services
Service detail: Electrical Engineering
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Electrical Engineering and Consulting Services
Service detail: Electrical Engineering

Harmonizing Relationships, Sustainability and Innovation
Project: The Lucas Museum of Narrative Art
It's not just business...it's personal.
Project: Route 66 Bridge

Innovative Power Solutions
Service detail: Power Systems Engineering
We engineer & design systems for the reliability of the power grid.
Project: Solar & Wind Interconnects
Partnering with you to deliver innovative, reliable energy solutions that enhance lives and strengthen the grid.
Project: 230kV Transmission Line EPC

Partners in Reliability, Resilience, Innovation, Sustainability, and Safety
Project: Pittsburgh International Airport Terminal Modernization Program
Provide the Highest Level of Service to Our Clients While Delivering Value
Project: 540 West Madison

Planning and design with O&M in mind
Project: APG Electrical Distribution System Infrastructure Upgrade

The deep tech powerhouse of Capgemini
Project: LEGO SMART Play Collaboration

The Right Team Matters
Project: 100 MW Hydrogen Production Plant

Engineering Excellence with Comprehensive Full Service Solutions
Project: Forensic Services Unit Chiller Replacement

Specialists in Electric Power Measurement for Today's Smart Grid Applications
Service detail: Power Metrology and Instrumentation

Full-service consulting engineering practice specializing in MEP, fire protection, and LEED-certified designs.
Service detail: Heating, Ventilation, and Air Conditioning (HVAC)
Engineering, Construction, and AI & Robotics
Service detail: Engineering & Design

Your Trusted Advisor.
Service detail: Electric Energy System Engineering & Analysis
Generating comprehensive and innovative solutions for the energy sector
Service detail: Power System Studies
Powering Innovation, Engineering Perfection
Project: MDWASD - Pump Station Design and Rehabilitation

Smarter EV Charging Starts Here
Service detail: Operations and Maintenance
Innovative and Sustainable MEP Engineering Solutions
Service detail: Mechanical Engineering
Full-Service Electrical Contractor
Project: Little Caesars Arena

O & S Services is a multi-disciplinary technology consulting practice incorporated in Texas in 2010, delivering electrical, mechanical, industrial, and systems engineering; cybersecurity; and technical translation. It has served the U.S. Department of Defense, major defense contractors including Lockheed Martin, Collins Aerospace, and Bell Flight, and commercial technology companies such as Texas Instruments, Qualcomm, Toyota, and Honeywell. Its engineers have contributed more than 25 articles to IEEE Consumer Electronics Magazine over a decade.
Service detail: Engineering Consulting
Proudly Serving Clients Since 1947
Service detail: Electric Utility Solutions
Meticulously Planned, Expertly Designed
Project: Allston Campus District Energy Plant