About the role
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.
Location: Tysons, Virginia / Hybrid
As a Senior Electrical Engineer – Battery Systems, Controls & EMS Integration, you will provide technical leadership for the design, validation, and optimization of utility-scale Battery Energy Storage System (BESS) projects supporting next-generation data center and grid applications. Reporting to the Chief Electrical Engineer, you will lead battery sizing, evaluate BESS technologies, validate inverter/PCS performance, and drive the integration of EMS, Plant Controllers, and SCADA systems to ensure reliable, high-performing energy storage solutions. This is a highly collaborative role that combines advanced engineering analysis, controls expertise, and operational optimization to shape the future of large-scale energy infrastructure.
Key Responsibilities:
· Battery sizing and lifecycle modeling
· BESS vendor model review and validation
· EMS and Plant Controller integration
· Controls strategy validation
· Inverter/PCS modeling experience
· SCADA and operational analytics
· Python, VS Code, Jupyter Notebooks, Git
Required Qualifications:
· 10+ years of electrical engineering experience, with a focus on battery systems, BESS vendor evaluation, inverter/PCS performance validation, and EMS or Plant Controller integration.
· Battery & Controls Expertise: Deep knowledge of battery sizing, lifecycle modeling, controls strategy validation, and BESS vendor model review in utility-scale energy storage environments.
· Systems Integration: Proven ability to lead EMS and Plant Controller integration efforts, including SCADA configuration and operational optimization for BESS deployments.
· Software Proficiency: Working knowledge of Python, VS Code, Jupyter Notebooks, and Git for engineering analysis and operational analytics.
· Communication: Ability to coordinate effectively with EMS vendors, controls engineers, and cross-functional teams to deliver reliable and optimized energy storage solutions.
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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 recruitment@onenergystorage.com
- Benefits vary by role and location and are subject to change.
