Controls Engineer

ON.energy is building the power infrastructure that makes the AI era possible. As AI demand surges past what the grid and traditional data centers can support, ON.energy provides a new class of power technology proven at gigawatt scale and trusted by the world's leading cloud and AI companies. Our systems are already deployed across 2.5 GW of hyper-scale campuses, validated by top U.S. national labs, and certified for grid-safe operation by major utilities.

With real products in the field, we're scaling faster than the grid can, transforming power from a bottleneck into a competitive advantage for the companies building the future.

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

What You'll Get

* Competitive salary + performance bonus

* 401(k) match, health, vision, dental

* Paid time off and company holidays

* Work that matters-building resilient, secure infrastructure for the future of energy