Controls Engineer

ON.energyis building the backbone of energy and AI infrastructure powering grid-safe data centers and mission-critical facilities. The company supplies and operates hyperscale power systems that solve the toughest resilience challenges, delivering custom solutions for AI data centers, mission-critical facilities, and front-of-the-meter assets. ON recently announced a 5GW partnership, with 3GW currently under construction across multiple hyperscale data center campuses. With patented technology and proprietary software,ON.energydevelops projects worldwide that set new benchmarks for resilience.

Location: Atlanta area is preferred. Role will require travel to projects sites.

Role Summary

The Controls Engineer is responsible for deploying, configuring, and supporting control systems for utility-scale Battery Energy Storage System (BESS) projects. This role is central to commissioning success, ensuring reliable operation and integration of Siemens PLC-based control systems with EMS, PCS, BMS, protection systems, and site networks.

Key Responsibilities

• Deploy, configure, and support Siemens PLC-based control systems for BESS projects
• Support commissioning activities including system bring-up, integration testing, and site acceptance testing (SAT)
• Troubleshoot PLC logic, communications, and I/O issues during commissioning and early operations
• Integrate PLCs with EMS, PCS, BMS, protection relays, meters, and SCADA systems
• Support communication protocols such as Modbus TCP/RTU, IEC 61850 (as applicable), and other OT interfaces
• Collaborate closely with Network Engineers, Deployment Engineers, EMS teams, and Field Commissioning teams
• Support factory acceptance testing (FAT) and field commissioning activities
• Assist with developing standardized PLC configurations, templates, and commissioning procedures
• Review and validate control system documentation, drawings, and as-built configurations
• Travel to project sites during deployment and commissioning phases as required

Required Experience & Skills

• Hands-on experience with Siemens PLC platforms (TIA Portal, S7-1500 / S7-1200 or similar)
• Experience commissioning or supporting industrial control systems in the field
• Strong understanding of PLC-based control architectures and OT systems
• Experience integrating PLCs with external systems (EMS, SCADA, PCS, BMS, protection)
• Ability to troubleshoot across controls, networking, and software boundaries
• Comfortable working in fast-paced commissioning environments with time pressure
• Willingness to travel to project sites during deployment and commissioning

Preferred Experience

• Experience with utility-scale BESS, power generation, renewables, or substation environments
• Familiarity with EMS platforms and grid-interactive systems
• Experience supporting commissioning teams on live sites
• Understanding of cybersecurity considerations in OT environments
• Background working alongside EPCs, vendors, and OEMs

What Success Looks Like (6–12 Months)

• Siemens PLC-based control systems are deployed reliably across new BESS projects
• Commissioning timelines are supported through rapid issue resolution and system readiness
• Control system integration issues are identified and resolved efficiently
• Documentation quality and repeatability improve across deployments
• Field and commissioning teams trust this role as a key technical partner

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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.
• Accommodations: If you need an accommodation during the application process, email View email address on click.appcast.io
• Benefits vary by role and location and are subject to change.