Senior High-Voltage Substation Supervisor - Data Centers

IREN; Sweetwater (TX); On-site; USD 115,000 - 135,000; Full time

Benefits offered by this job

Health insurance

401(k) with company match

Paid time off

Relocation assistance

Job summary

IREN is seeking a Construction High Voltage (HV) Supervisor in Sweetwater, TX to lead HV switching, isolation, grounding, and restoration activities for critical data center infrastructure. You will manage HV technicians, coordinate with contractors, and ensure safe, compliant outage execution while partnering with Engineering and Operations.

The role requires 7+ years in HV systems, supervisory experience, and relevant licenses/certifications (NFPA 70E, OSHA 30, NETA).

Qualifications

• High school diploma or equivalent required.
• Minimum 7 years of experience working with high-voltage systems (13.8kV–345kV) in substations, utilities, industrial facilities, or data center environments.
• Minimum 2 years in a lead or supervisory role overseeing HV electrical work execution.
• Journeyman or Master Electrician license, or Journeyman Lineman license.
• Authorized/qualified for high-voltage switching.
• NETA certification or equivalent HV testing experience.
• NFPA 70E and OSHA 30 certification.
• Expert knowledge of HV switching procedures and substation safety practices.
• Strong technical understanding of power transformers, circuit breakers, protective relays, battery and DC control systems, Substation control schemes.
• Ability to read and interpret one-lines diagrams, schematics, wiring diagrams, relay logic, and coordination studies.
• Working knowledge of HV testing and diagnostics, including: DGA / oil analysis, insulation resistance testing, breaker timing, infrared thermography, SF6 handling and testing.
• Strong leadership presence with effective communication and contractor coordination skills.
• Proven ability to make sound decisions during outages, abnormal operating conditions, and emergency response events.
• Profi cient with QA/QC systems, PtW and Switching Instruction documentation, and reporting standards.

Responsibilities

• Supervise daily HV construction activities to ensure safe, compliant, and high-quality execution across substations.
• Lead HV switching, isolation, grounding, and restoration activities in accordance with company procedures and NFPA 70E / OSHA requirements.
• Oversee installation, commissioning, and energization of HV equipment, including transformers, circuit breakers, switchgear, protective relays, and control power systems.
• Coordinate and oversee third-party contractors performing HV testing, and commissioning work; verify qualifications, scope compliance, and work quality.
• Ensure compliance with NEC, NERC (where applicable), local utility requirements, and internal operational standards.
• Review, approve, and maintain switching orders, QA/QC reports, condition assessments, test results.
• Support fault response, troubleshooting, incident investigations, and root cause analysis (RCA); implement corrective actions to prevent recurrence.
• Partner with Engineering and Operations on outage planning, load transfers, equipment upgrades, commissioning, and energization activities.
• Provide leadership, mentoring, and training to HV technicians, reinforcing safe work practices and procedural discipline.
• Maintain strict adherence to all safety policies and procedures. Safety is a condition of employment.

Skills

Leadership

Diagram Reading

Contractor coordination

Outage decisions

Safety compliance

HV knowledge

Education

Journeyman Electrician license

Master Electrician license

Lineman license

Job description

IREN is seeking a Construction High Voltage (HV) Supervisor in Sweetwater, TX to lead HV switching, isolation, grounding, and restoration activities for critical data center infrastructure. You will manage HV technicians, coordinate with contractors, and ensure safe, compliant outage execution while partnering with Engineering and Operations.

The role requires 7+ years in HV systems, supervisory experience, and relevant licenses/certifications (NFPA 70E, OSHA 30, NETA).