Senior Engineer - Battery Energy Storage Systems (BESS)

Engie-posted 14 days ago

$99,000 - $151,800/Yr

Full-time • Mid Level

Hybrid • Broomfield, CO

5,001-10,000 employees

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What You Can Expect As a Battery Energy Storage Systems (BESS) Senior Engineer within Renewables Flex Power Business Unit (RFGBU) in North America, you will play a key role in developing advanced battery energy storage solutions, with a focus on lithium-ion technologies. You’ll collaborate with Subject Matter Experts (SMEs) to define system requirements, design battery systems, specify components, and support both business development and operations teams. Your responsibilities will span the full project lifecycle—from initial design and sizing through development, installation, commissioning, and operation. You’ll generate detailed bills of materials for cost evaluation and serve as the primary engineering interface for EPC partners, ensuring technical excellence throughout project execution.

Lead the design and development of lithium-ion Battery Energy Storage Systems (BESS), including system sizing, layout, and component specification, in collaboration with Subject Matter Experts (SMEs)
Oversee all technical aspects of project execution—from design through commissioning and operation—serving as the primary engineering interface for EPC partners and Owner’s Engineers
Support business development by identifying technical requirements, engaging with utilities and Authorities Having Jurisdiction (AHJs), and contributing to proposals and cost evaluations
Review and ensure compliance with system designs and drawings with ENGIE standards, NEC, IEEE, and other applicable codes and regulations
Independently lead and collaborate with project teams to deliver high-quality electrical engineering, including oversight of consultants and contractors, ensuring compliance with company policies, safety standards, interconnection agreements, and overall project objectives
Generate and update site layouts, grading and stormwater plans, single ‑ line and utility diagrams, and incorporate external survey, geotechnical, and consultant drawings—maintaining company CAD standards
Support Operations & Maintenance (O&M) teams through training, troubleshooting, and staying current on emerging technologies, industry standards, and regulatory changes

Minimum of a Bachelor's Degree in Electrical or Mechanical Engineering or related field
At least five (5) years of experience in renewable systems engineering, with a focus on battery energy storage
Extensive technical expertise in battery energy storage systems (BESS), including inverters, transformers, substations, protection and controls, battery management and energy management systems
Proven experience managing projects across the full lifecycle—from design through commissioning—while collaborating with EPCs, SMEs, and O&M teams
Analytical and problem-solving skills applied to complex BESS challenges, including system integration and performance optimization
Proficiency in creating, reading, and interpreting construction plans and technical specifications
Advanced AutoCAD Civil 3D experience to create and revise full civil drawing sets for utility ‑ scale BESS sites
Excellent communication skills and the ability to engage effectively with internal stakeholders, utilities, and regulatory authorities
Must be available to travel domestically up to 30% of the time and with the need for some overnight trips
Must be willing and able to comply with all ENGIE ethics and safety policies

comprehensive benefits package includes options for medical, dental, vision, life insurance, employer-paid short-term and long-term disability insurance, ESPP, generous paid time off including wellness days, holidays and leave programs
401(k) Retirement Savings Plan with a company match
supplemental benefits for full time employees that enhance emotional and physical well-being through all stages of life from family forming to caregiver benefits

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