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Medium Voltage

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Big State Electric's Medium Voltage Division

delivers safe, reliable power solutions for customers across Texas. From government facilities and educational campuses to power plants, industrial operations, and commercial developments, our experienced team provides specialized medium voltage construction, maintenance, repairs, upgrades, and emergency support. Whether it's a new installation, system expansion, or low voltage repair and upgrades, we have the expertise and resources to keep your electrical infrastructure operating safely and efficiently. 

OUR MEDIUM VOLTAGE SERVICES INCLUDE:

  • Power system engineering
  • Utility coordination
  • Distribution system planning
  • Load flow analysis
  • Short circuit studies
  • Protective device coordination
  • Arc flash studies
  • One-line diagrams
  • Construction drawings and specifications
  • Project estimating and budgeting
  • Medium voltage cable installation
  • Duct bank construction
  • Direct-buried cable systems
  • Conduit installation
  • Cable pulling
  • Cable splicing
  • Cable terminations
  • Cable fault locating
  • Cable replacement
  • Manhole and vault installation
  • Grounding systems
  • Utility pole installation and replacement
  • Pole line construction
  • Crossarm installation and replacement
  • Pole framing
  • Overhead conductor installation
  • Reconductoring projects
  • Distribution line extensions
  • Pole-top switch installation
  • Cutouts and fused disconnect installation
  • Lightning arrestor installation
  • Recloser installation
  • Sectionalized installation
  • Capacitor bank installation
  • Voltage regulator installation
  • Overhead transformer installation
  • Guying and anchoring
  • Down-guy installation
  • Service relocations
  • Storm restoration
  • Emergency line repairs
  • Pole inspections
  • Metal-clad switchgear installation
  • Unit substations
  • Pad-mounted switchgear
  • Ring Main Units (RMUs)
  • Transformer installation
  • Bus duct installation
  • Busway systems
  • Equipment rigging
  • Equipment replacement
  • Pad-mounted transformers
  • Pole-mounted transformers
  • Dry-type transformers
  • Power transformers
  • Transformer replacement
  • Oil sampling and analysis
  • Acceptance testing
  • Commissioning
  • Insulation resistance testing
  • Energization support
  • Scheduled maintenance programs
  • Switchgear maintenance
  • Breaker maintenance
  • Transformer inspections
  • Torque verification
  • Grounding inspections
  • Battery system maintenance
  • Equipment cleaning and lubrication
  • 24/7 emergency response
  • Storm restoration
  • Utility outage support
  • Fault isolation
  • Temporary power systems
  • Emergency cable repairs
  • Emergency overhead repairs
  • Equipment replacement
  • Disaster recovery support
  • Breaker retrofits
  • Switchgear upgrades
  • Smart grid technologies
  • Power quality improvements
  • Distribution system expansion
  • Arc flash assessments
  • NFPA 70E compliance
  • OSHA compliance
  • Lockout/Tagout (LOTO)
  • Electrical safety training
  • Energized work planning
  • Site safety audits
  • PPE assessments
  • Utility interconnections
  • Solar collection systems
  • Wind generation interconnections
  • Battery Energy Storage Systems (BESS)
  • Generator interconnections
  • Data center power distribution
  • Critical infrastructure support
  • Microgrid integration

SOME OF THE PLACES

WE'VE WORKED

Plants, Wind Farms, Flood Recovery

• Victoria, TX Chemical Plant 
• Gonzales, TX Chemical Plant 
• Houston, TX Flood recovery  
• Hurricane Harvey Sweetwater, TX 
• Allen, TX Wind Farm 
• Kermit, TX Gas Plant 
• Portland, TX Sand Plant 
• Schneider, TX Data Centers 

Data Centers, Manufacturing, Assembly Plants

• San Antonio Confidential 80MW Data Center  
• Toyota Manufacturing 
• Hutto Data Center 
• Pflugerville Data Center 
• DFW7 Data Center 
• Navistar Assembly Plant 
• Cyrus 1 Data Center 
• CPS Energy 

Universities, Institutions, Corporations

• University Health System Palo Alto Hospital 
• Texas State University 
• Southwest Research Institute 
• Texas Biomedical Institute 
• Texas A&M University San Antonio 
• University of Incarnate Word 
• Trinity University 
• Samsung Austin 
• Space X 
• Tesla 

Project too much for standard building power contractor but not enough for a major utility transmission line contractor? Our experienced medium voltage team has you covered! Medium Voltage electrical systems require a special skillset and specific set of knowledge and equipment to manage. Our team is comprised of licensed MV electricians with the specialized training needed to take on challenging medium voltage projects.  

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Electrical System Upgrades & Retrofits
  • Evaluate existing electrical infrastructure
  • Design upgraded distribution systems (panels, feeders, capacity)
  • Replace outdated or undersized equipment
  • Improve reliability and redundancy

Lighting Design & Retrofit Projects
  • Site evaluation and lighting audits
  • Design of interior, exterior, and site lighting systems
  • LED retrofit planning and layout
  • Controls integration (timers, occupancy sensors, smart systems)

Tenant Improvements / Build-Outs
  • Electrical design for new office, retail, or industrial spaces
  • Power and lighting layouts
  • Circuiting and panel schedules
  • Coordination with general contractors and other trades

Equipment Power & Infrastructure Design
  • Power requirements analysis for new equipment
  • Design of dedicated circuits and disconnects
  • Coordination with equipment vendors
  • Installation and commissioning

EV Charging Infrastructure
  • Site feasibility and load capacity analysis
  • Design of EV charger layout and electrical infrastructure
  • Utility coordination
  • Installation and commissioning

Backup Power & Emergency Systems
  • Generator sizing and system design
  • Automatic transfer switch (ATS) design
  • Critical load identification
  • Integration with existing systems

Medium Voltage Distribution Design
  • Evaluation of existing MV systems
  • Design of feeders, terminations, and switchgear layouts
  • Coordination with utility providers
  • System upgrades and expansions

Power Quality & System Optimization
  • Load studies and power quality analysis
  • Design solutions for harmonics, imbalance, or voltage issues
  • Capacitor banks or system corrections

Code Compliance & Safety Upgrades
  • Facility assessments for NEC compliance
  • Design of corrective solutions
  • Panel upgrades, grounding improvements, labeling systems

Communication & Low Voltage System Design
  • Structured cabling design (data, voice)
  • Security and access control system layouts
  • Coordination with IT and security vendors

Our typical repair services include: 

General Electrical Repairs (Low Voltage / Standard Power)
  • Circuit breaker replacement and repair
  • Panelboard troubleshooting and repair
  • Fuse replacement and disconnect repairs
  • Wiring repairs (damaged, aging, or faulty conductors)
  • Receptacle, switch, and device replacement
  • Lighting system repairs (interior/exterior)
  • Ground fault and short circuit repairs
  • Power loss diagnostics and restoration
  • Overloaded circuit correction

Medium Voltage Repairs 
  • Medium voltage cable repair and termination
  • Switchgear troubleshooting and repair
  • Transformer diagnostics and repair coordination
  • Primary distribution fault isolation
  • Splice and termination repairs
  • Pad-mounted and substation equipment repairs
  • Insulation failure identification
  • Infrared (thermal) diagnostics and corrective work
  • Coordination with utility providers for outages and repairs

Emergency Electrical Repairs
  • 24/7 emergency response services
  • Power outage restoration
  • Storm damage repair
  • Emergency disconnect and isolation of hazardous systems
  • Temporary power setup and restoration
  • Critical system repairs to restore operations
  • Burnt equipment replacement (panels, breakers, conductors)

Commercial & Industrial Equipment Repairs
  • Motor control circuit troubleshooting
  • Control panel repair and component replacement
  • Disconnect switch repair/replacement
  • Equipment power supply repairs
  • HVAC electrical repairs
  • Machinery and production equipment troubleshooting
  • VFD (Variable Frequency Drive) troubleshooting

Lighting & Controls Repairs
  • Interior and exterior lighting repairs
  • Parking lot and site lighting repair
  • LED driver and ballast replacement
  • Lighting control system troubleshooting
  • Photocell and timer repairs
  • Emergency and exit lighting repairs

Communication & Low Voltage System Repairs
  • Data/communication line repairs
  • Network cabling troubleshooting
  • Phone system wiring repairs
  • Security system power and wiring repairs
  • Access control system electrical repairs
  • Camera (CCTV) power and connectivity troubleshooting

Power Quality & System Troubleshooting
  • Voltage drop and fluctuation diagnostics
  • Harmonic and load imbalance troubleshooting
  • Nuisance breaker tripping analysis
  • Phase loss detection and correction
  • Grounding and bonding issue repairs
  • Power factor-related issues (if applicable)

Preventative & Corrective Repair Work
  • Identification and replacement of failing components
  • Tightening and re-termination of loose connections
  • Corrosion-related repairs
  • Heat-damaged equipment replacement
  • Aging infrastructure upgrades discovered during maintenance

Small-Scale Service Repairs
  • Adding or relocating outlets and switches
  • Minor circuit modifications
  • Breaker resets and minor troubleshooting
  • Quick-response tenant/service calls
  • Office and retail electrical fixes

Large-Scale Repair Projects
  • Major feeder and distribution repairs
  • Panel and switchgear replacement due to failure
  • Facility-wide electrical system repairs
  • Service entrance repairs and upgrades
  • Post-incident electrical rebuilds (fire, flood, equipment failure)

Safety & Code-Related Repairs
  • Correction of NEC violations
  • GFCI/AFCI repairs and upgrades
  • Grounding and bonding corrections
  • Panel labeling and identification corrections
  • Repair of unsafe or non-compliant installations

Temporary & Backup Power Repairs
  • Generator connection troubleshooting
  • Transfer switch repair
  • Temporary power system repairs
  • Backup system restoration

Our FM services include:

1. Preventative Maintenance & Repairs
  • Comprehensive PM Program
  • Panel and breaker inspections (tightening, thermal checks if applicable)
  • Testing of circuits and load balancing
  • Inspection of transformers, switchgear, and disconnects
  • Lighting system checks (interior, exterior, emergency lighting)
  • Backup system checks (generators, UPS if applicable)
  • Preventative replacement of worn components
  • Documentation and maintenance reports

2. Troubleshooting & Repairs
  • Day-to-day service calls:
  • Diagnosing power outages, shorts, and faults
  • Repairing wiring, breakers, panels, and devices
  • Fixing lighting issues and control systems
  • Addressing nuisance tripping or overload issues
  • Equipment failure diagnostics

3. Installation & Upgrades
  • Project-based work that can stem from maintenance findings:
  • New circuit installations
  • Panel upgrades and replacements
  • Lighting upgrades (LED retrofits, energy efficiency)
  • Equipment hookups (HVAC, machinery, etc.)
  • Dedicated circuits for new equipment
  • EV chargers (increasingly common)
  • Temporary power setups

4. Emergency & On-Call Services
  • 24/7 or defined on-call availability
  • Priority response times
  • Emergency repairs to restore power or safety
  • Storm or outage response

5. Code Compliance & Safety Work
  • Helps the client stay out of trouble:
  • Bringing systems up to NEC and local code
  • Correcting violations found in inspections
  • GFCI/AFCI upgrades where required
  • Grounding and bonding corrections
  • Labeling panels and circuits properly
  • Supporting third-party inspections

6. Preventative Maintenance Programs
  • Custom maintenance schedules for the facility
  • Asset tracking (panels, equipment, circuits)
  • Lifecycle planning for electrical components
  • Recommendations for replacements/upgrades
  • Budget forecasting for electrical work

7. Energy Efficiency & Optimization
  • Lighting audits and retrofit recommendations
  • Load analysis and balancing
  • Power quality assessments
  • Suggestions to reduce energy consumption
  • Assistance with rebates or incentive programs

8. Small Projects & Ongoing Improvements
  • Adding outlets, circuits, or disconnects
  • Minor remodel electrical work
  • Office/tenant improvements
  • Equipment relocations
  • Low-voltage support

9. Documentation & Reporting
  • Service reports after each visit
  • Maintenance logs
  • Issue tracking and resolution history
  • Recommendations for future work
  • As-built updates (if applicable)

10. Coordination & Support
  • Coordination with facility managers
  • Working alongside other contractors (HVAC, mechanical, etc.)
  • Scheduling around business operations
  • Supporting shutdowns or off-hours work
  • Consulting on electrical decisions

1. Routine Maintenance & Preventative Services

  • Scheduled electrical system inspections (monthly/quarterly/annual)
  • Panel and breaker inspections (tightening, thermal checks if applicable)
  • Testing of circuits and load balancing
  • Inspection of transformers, switchgear, and disconnects
  • Lighting system checks (interior, exterior, emergency lighting)
  • Backup system checks (generators, UPS if applicable)
  • Preventative replacement of worn components
  • Documentation and maintenance reports


2. Troubleshooting & Repairs

  • Day-to-day service calls:
  • Diagnosing power outages, shorts, and faults
  • Repairing wiring, breakers, panels, and devices
  • Fixing lighting issues and control systems
  • Addressing nuisance tripping or overload issues
  • Equipment failure diagnostics


3. Installation & Upgrades

  • Project-based work that can stem from maintenance findings:
  • New circuit installations
  • Panel upgrades and replacements
  • Lighting upgrades (LED retrofits, energy efficiency)
  • Equipment hookups (HVAC, machinery, etc.)
  • Dedicated circuits for new equipment
  • EV chargers (increasingly common)
  • Temporary power setups


4. Emergency & On-Call Services

  • 24/7 or defined on-call availability
  • Priority response times
  • Emergency repairs to restore power or safety
  • Storm or outage response


5. Code Compliance & Safety Work

  • Helps the client stay out of trouble:
  • Bringing systems up to NEC and local code
  • Correcting violations found in inspections
  • GFCI/AFCI upgrades where required
  • Grounding and bonding corrections
  • Labeling panels and circuits properly
  • Supporting third-party inspections


6. Preventative Maintenance Programs

  • Custom maintenance schedules for the facility
  • Asset tracking (panels, equipment, circuits)
  • Lifecycle planning for electrical components
  • Recommendations for replacements/upgrades
  • Budget forecasting for electrical work


7. Energy Efficiency & Optimization

  • Lighting audits and retrofit recommendations
  • Load analysis and balancing
  • Power quality assessments
  • Suggestions to reduce energy consumption
  • Assistance with rebates or incentive programs


8. Small Projects & Ongoing Improvements

  • Adding outlets, circuits, or disconnects
  • Minor remodel electrical work
  • Office/tenant improvements
  • Equipment relocations
  • Low-voltage support


9. Documentation & Reporting

  • Service reports after each visit
  • Maintenance logs
  • Issue tracking and resolution history
  • Recommendations for future work
  • As-built updates (if applicable)


10. Coordination & Support

  • Coordination with facility managers
  • Working alongside other contractors (HVAC, mechanical, etc.)
  • Scheduling around business operations
  • Supporting shutdowns or off-hours work
  • Consulting on electrical decisions

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