Business Details
45 Years
experience
Emergency
services
Trusted Electrical Contractors in San Antonio
Grubb Engineering, Inc. (GEI) has been a trusted leader in electrical power systems design, commissioning, and maintenance since 1981. Our expertise spans low, medium, and high-voltage systems, serving water/wastewater plants, electric utility facilities, and large industrial clients globally. As a NETA-accredited company, we combine state-of-the-art technology with decades of experience to deliver safe, reliable solutions.Our engineering team specializes in power system studies, SCADA design, and instrumentation, while our technical services division provides comprehensive testing and maintenance. With a legacy of innovation and a commitment to client-specific needs, we ensure operational excellence through rigorous quality standards and certified professionals.
Services
Electrical System Design
Power Quality Analysis
Arc Flash Hazard Analysis
Transformer Testing
SCADA System Design
Cable Fault Detection
Switchgear Maintenance
Ground Testing
Load Bank Testing
Radio Path Studies
Details
- Year established: 1981
Highlights and features
- We offer 40+ years of specialized expertise in electrical power systems for critical infrastructure.
- Our NETA-accredited technical services ensure compliance with industry safety and quality standards.
- We provide end-to-end solutions from design to maintenance with in-house engineering and testing teams.
- Our team includes PMP-certified project managers and NETA Level II technicians with nuclear experience.
- We maintain 24/7 operational readiness for emergency maintenance shutdowns and system evaluations.
Associations and certifications
- International Electrical Testing Association (NETA)
Services
Electrical System Design
Our electrical system design covers voltages from 120V to 4160V+, serving commercial, industrial, and utility clients. We specialize in potable water facilities, wastewater treatment plants, and electric substations. Our engineers create customized SCADA and control systems that optimize operational efficiency while ensuring compliance with NEC and NFPA standards.
Arc Flash Hazard Analysis
We conduct comprehensive arc flash studies to determine proper PPE requirements and equipment labeling. Using IEEE 1584 methodologies, our analysis identifies potential hazards in electrical systems, ensuring compliance with OSHA and NFPA 70E standards while improving worker safety during maintenance operations.
Transformer Testing
Our NETA-certified technicians perform power factor, ultrasonic, and partial discharge testing on transformers. We analyze oil and gas content to assess insulation quality, using energized testing methods that minimize downtime while identifying potential failure points in critical electrical infrastructure.
Cable Fault Detection
We employ VLF Tan Delta and partial discharge testing for medium voltage cables, combined with thermal infrared scanning. Our non-destructive methods identify insulation degradation and fault locations in energized systems, preventing unplanned outages while extending cable lifecycle performance.
Switchgear Maintenance
Our maintenance services include insulation resistance testing, contact resistance measurement, and vacuum bottle testing for switchgear. We perform thermal scans and TEV testing on energized equipment, ensuring optimal performance while reducing arc flash risks through regular preventive maintenance programs.
People
Robert D. Grubb, Jr.
President and Electrical Test Technician IV
Leading technical services since 1992, Robert oversees testing operations and client support. He specializes in electrical system testing and presents industry seminars on switchgear maintenance and safety protocols.
Steven Mouser, P.E.
Engineering Manager
Licensed Professional Engineer with 20+ years of experience designing electrical systems for water and wastewater facilities. He supervises engineering projects and contributes to IEEE Power & Energy Society initiatives.
Devin Castillo
Electrical Test Technician II
NETA Level II certified technician with nuclear experience from U.S. Navy service. He manages testing operations and performs arc flash analysis while maintaining thermography certifications.
Robert D. Grubb, P.E.
Founder Principal Engineer
Established the company in 1981 after 11 years at CPS Energy. He specializes in substation design and protection engineering, authoring technical papers presented at international conferences.
Joy L. Grubb
Past President
Sole owner since 1992, Joy manages financial operations and human resources. Her leadership ensures technical teams focus on delivering engineering excellence while maintaining business stability.
Questions
What electrical services does Grubb Engineering offer?
We provide electrical system design, power quality analysis, arc flash studies, transformer testing, switchgear maintenance, and NETA-certified equipment testing for utilities and industrial clients.
How experienced is Grubb Engineering's team?
Our engineers and technicians hold NETA certifications, PMP credentials, and nuclear experience, with 40+ years of combined expertise in critical power systems.
Do you serve clients outside Texas?
While based in Texas, we deliver services nationally and internationally for water/wastewater facilities, electric utilities, and industrial projects.
What safety standards do you follow?
We comply with NFPA 70E, NEC, and OSHA regulations, including arc flash hazard analysis and proper PPE selection for all electrical work.
Can you handle emergency maintenance?
Yes, we perform urgent maintenance shutdowns and system evaluations to prevent catastrophic failures in electrical infrastructure.
