HVAC O&M Technician (Senior-level) - Terra-Gen - Mojave

Terra-Gen

Terra-Gen is one of the largest integrated and independent renewable energy power producers in the United States. We are an end-to-end project development, financing and operating company producing quality, utility-scale renewable power across a diverse set of technologies. Our mission is to provide affordable, clean energy, at a large scale, to help the nation achieve its goals of energy security, grid resiliency and having a meaningful impact on climate change.

Terra-Gen is seeking a highly skilled and specialized BESS HVAC Technician to serve as the technical authority for the critical cooling infrastructure supporting our Battery Energy Storage Systems (BESS) to standards above the industry's best practices. This role is responsible for maintaining high-precision thermal management systems (liquid cooling and forced air systems), that function as the "life support" for our utility-scale battery storage assets, ensuring maximum uptime, reliability, and performance.

This position focuses on precision thermal management systems required to maintain strict temperature control in mission critical, large-scale battery facilities. The BESS HVAC Technician performs but is not limited to both scheduled and unscheduled fieldwork, including installation, advanced troubleshooting, testing, commissioning support, preventive maintenance, and corrective maintenance of complex mechanical, refrigeration, and controls systems.

This role requires advanced diagnostic capability, strong leadership presence, and the ability to manage and optimize sophisticated cooling infrastructure in high-reliability environments. The technician may also be responsible for overseeing and observing the quality and safety practices of contractors performing HVAC corrective maintenance, retrofits and commissioning type work.

The ideal candidate is a self-starter who reports to and takes direction from the Maintenance Supervisor while demonstrating technical leadership in the field. This full-time position is based near Mojave, CA, and may include rotating schedules, overtime, nights, weekends, holidays, and participation in an on-call rotation. Some travel will be required for this position.

This role offers significant opportunities for professional growth within Terra-Gen.

Essential Duties And Responsibilities

The candidate may perform work independently and/or in a team environment, depending upon skills, experience and job task.

Responsibilities include, but are not limited to, safe and efficient troubleshooting, testing, repair, and maintenance of HVAC systems supporting Battery Energy Storage Systems (BESS). The technician will apply established safety protocols and industry best practices while diagnosing and servicing air conditioning, heating, refrigeration, and associated electrical and controls components.

Testing and diagnostic activities include, but are not limited to, open circuit voltage, operating DC current, and resistance measurements; refrigerant pressure and superheat/subcooling verification; leak detection; airflow measurement and static pressure testing; compressor performance analysis; control system signal verification; sensor calibration; and functional performance testing to ensure systems operate within required thermal parameters.

• Lead Maintenance Execution:
  Direct, guide and train others while accomplishing all scheduled and unscheduled maintenance activities on BESS HVAC and thermal management systems to ensure maximum uptime and reliability while maintaining all warranties.
• Advanced Diagnostics & Repair:
  Perform complex troubleshooting and repair of refrigeration, electrical, mechanical, and control systems, including industrial HVAC units, chillers, liquid-to-air heat exchangers, and associated components.
• Thermal & Electrical Testing:
  Conduct diagnostic testing including open circuit voltage, operating DC current, resistance testing, refrigerant pressure analysis, superheat/subcool verification, airflow measurement, static pressure testing, thermography of low and medium voltage equipment, and control system signal validation.
• Coolant System Management:
  Monitor, flush, refill, and maintain dielectric fluid and glycol-based cooling loops; inspect high-density piping and fittings for integrity and leak prevention.
• System Commissioning & Performance Validation:
  Commission new systems, validate operational performance, and ensure compliance with design specifications and thermal operating parameters.
• Controls & System Integration:
  Interface with PLC and SCADA systems to monitor system performance, adjust setpoints, calibrate sensors, and optimize thermal efficiency.
• Emergency Response & Alarm Management:
  Respond immediately to high-temperature and system alarms to mitigate risk of battery degradation, system failure, or fire hazards.
• Safety Leadership & Compliance:
  Maintain strict adherence to high-voltage safety standards (including NFPA 70E), complete safe work permits and Job Hazard Analyses (JHAs), exercise…