Field Service Technician III

About the job

ON.energy is setting the standard for large load interconnection. ON’s patented AI UPS™ is a medium-voltage UPS that serves as a firewall, protecting the data center from the grid, and the grid from the data center. With multiple gigawatts currently under construction, we are enabling grid-safe data centers.

ON.energy is seeking a skilled Field Service Technician to support day-to-day operations across a portfolio of five or more ON.energy projects in the Houston area. Reporting directly to the Operations & Maintenance Manager, the technician is responsible for executing preventative and reactive maintenance activities on ON.energy equipment and inverter systems at each site, ensuring maximum asset reliability and uptime across the portfolio. The role follows a standard daytime schedule; after-hours or weekend response is occasional and infrequent.

Key Responsibilities

Preventative Maintenance

• Execute scheduled preventative maintenance (PM) tasks on ON.energy BESS equipment, inverters, and associated electrical infrastructure in accordance with OEM requirements and site-specific maintenance plans.

• Perform routine inspections, functional testing, and condition monitoring to identify potential issues before they result in equipment failure or unplanned downtime.

• Maintain accurate PM records and equipment histories within the CMMS, ensuring all work orders are opened, updated, and closed in real time.

• Plan and prioritize PM activities across multiple sites, adhere to scheduling windows, and notify the O&M

• Manager promptly of any deferred work, observed anomalies, or required escalations.

Reactive Maintenance & Troubleshooting

• Respond to equipment alarms, faults, and unplanned failures in a timely manner, performing systematic diagnosis and root cause identification.

• Execute testing procedures including insulation resistance, continuity, and functional testing to isolate faults and confirm equipment readiness post-repair.

• Perform component-level repair and replacement on inverters, battery modules, switchgear, and associated balance-of-plant equipment.

• Document all corrective maintenance activities, findings, and parts used within the CMMS and report outcomes to the O&M Manager.

• Support occasional after-hours or weekend response when site conditions require it, keeping the O&M Manager informed with timely status updates.

Site Coordination & Continuous Improvement

• Supervise and coordinate contractors, vendors, and ON.energy resources performing service work on site.

• Support coordination with energy dispatch to schedule outages and complete performance testing for services work.

• Identify and report field service risks to the O&M Manager and other relevant stakeholders.

• Travel regularly between Houston-area project sites to execute planned work and to investigate and resolve issues, or supervise their resolution, as needed.

• Travel as requested to ON.energy projects outside the Houston area to support maintenance, troubleshooting, or project needs at other sites.

• Support continuous improvement by documenting lessons learned and opportunities to increase efficiency.

CMMS & Data Integrity

• Create, update, and close work orders within the CMMS for all preventative and corrective maintenance activities in accordance with site data entry standards.

• Ensure equipment histories, parts consumption, and labor records are accurately captured to support asset lifecycle management and reporting.

• Follow CMMS workflows and procedures as directed by the O&M Manager; contribute to continuous improvement of maintenance records and documentation quality.

Safety & Compliance

• Adhere to all site safety protocols, OSHA standards, NFPA 70E electrical safety requirements, and ON.energy work instructions at all times.

• Assist in the monitoring and enforcement of safety procedures, quality standards, and best practices on site.

• Participate actively in toolbox talks, safety briefings, incident investigations, and corrective action implementation.

• Maintain personal protective equipment (PPE) and ensure proper lockout/tagout (LOTO) procedures are followed for all maintenance activities.

• Report all near-misses, incidents, and unsafe conditions to the O&M Manager immediately.

Qualifications

• Education : 2+ years of field experience in electrical systems maintenance, commissioning, energy storage, renewables, or critical infrastructure environments

• Technical Skills: Demonstrated ability to read and interpret single-line diagrams, wiring schematics, and equipment manuals; hands-on experience with inverters, battery systems, or HV/MV electrical equipment preferred; working understanding of SCADA, networking, and communication systems

• CMMS & Software : Prior experience with a CMMS platform (e.g., IBM Maximo, UpKeep, Fiix, or equivalent) is a plus; willingness to learn and consistently apply CMMS workflows is required; proficient with Microsoft Office

• Certifications : Must be able to obtain and maintain CPR, OSHA 10/30, and NFPA 70E certifications upon hire; valid driver’s license required

• Physical Requirements : Able to occasionally lift 25–50 lbs and perform field work outdoors in varying weather conditions

• Schedule & Travel: Standard daytime schedule with occasional after-hours or weekend response as needed; regular local travel between five or more project sites in the Houston area, with occasional travel to ON.energy projects outside the Houston area when requested

• Location : Must reside in or near the Houston, TX area, or be willing to relocate prior to start date

• Communication & Teamwork : Able to communicate clearly and professionally with team members and the O&M Manager; proficient in written documentation for maintenance records; works well both independently and as part of a team in a fast-paced environment

For US-based roles - What you’ll get:

• Competitive salary + annual performance-based bonus eligibility

• Medical, dental, and vision insurance

• 401(k) with company match

• Paid time off and company holidays

For Mexico-based roles - What you’ll get:

• Competitive salary + annual performance bonus eligibility

• Christmas Bonus (Aguinaldo): 30 days

• Major medical expenses and life insurance

• Paid time off and holidays (per local policy)

For all roles:

• Professional development and growth opportunities

• Opportunity to grow with a mission-driven team shaping the future of clean energy

• Equal Opportunity: ON.energy is committed to equal employment opportunity and to maintaining a work environment free of harassment, discrimination, or retaliation.

• Benefits vary by role and location and are subject to change.

Agency Notice: ON.energy does not accept unsolicited resumes from staffing agencies, search firms, or third-party recruiters. Resumes submitted without a fully executed Master Services Agreement (MSA) and a written request from an authorized member of our Talent Acquisition team will be considered the property of ON.energy. No placement fees or compensation will be paid for unsolicited candidate submissions.