Controls Engineer

Controls Engineer

ON.energy is 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.energy develops projects worldwide that set new benchmarks for resilience.

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

Competitive salary + annual performance-based bonus eligibility Medical, dental, and vision insurance 401(k) with company match Paid time off and company holidays 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.