Senior Manager of BESS Engineering

OneEnergy Renewables; Seattle (WA); On-site; USD 130,000 - 200,000; Full time

Job summary

OneEnergy Renewables in the Seattle area seeks a Sr. BESS Manager to lead and stand up our battery energy storage engineering capability.

You will oversee design standards, CAPEX methods, and a cross-functional team across Development, Preconstruction, Finance, and Engineering, directing engineers and coordinating with external partners. The role requires 6+ years in engineering with BESS, NEC/NFPA/UL expertise, RFP leadership, and hands-on design.

Qualifications

• Degree in electrical, mechanical, or related engineering field.
• PE license or clear near-term licensure path.
• 6+ years in professional engineering, construction, or land development with BESS focus.
• Experience delivering multiple DG and/ or utility-scale BESS projects through construction and commissioning.
• Experience selecting, sizing, and procuring BESS equipment across multiple OEMs and integrators.
• Strong familiarity with NEC (including Article 706), NESC, NFPA 855, and UL 9540/ UL 9540A for energy storage.
• Experience leading RFP responses and interconnection and permitting interactions with utilities and AHJs.
• Experience managing internal engineering resources and mentoring direct reports.
• Strong communication and negotiation with off-takers, contractors, stakeholders.
• Detail-oriented with integrity and ability to manage multiple projects.

Responsibilities

• Define and maintain BESS design standards and templates.
• Establish workflow to track BESS status, tiering, and prioritization.
• Lead DG and utility-scale BESS plant design and approve drawings.
• Lead design discussions with engineers and consultants.
• Lead BESS CAPEX sizing, guarantees, warranties, and cost estimates.
• Drive equipment selection with Preconstruction Team.
• Own relationships with BESS integrators and suppliers.
• Maintain safety standards meeting NFPA 855, NEC 706, UL 9540A.
• Lead BESS RFP responses and coordinate vendor details.
• Provide feedback on System Impact and Feasibility Studies.
• Bridge Development, Preconstruction, Finance, and Engineering activities.
• Support community outreach, permitting, and pipeline planning.

Skills

Leadership

Stakeholder communication

Project management

Team mentoring

Negotiation

Education

Electrical or Mechanical Engineering degree

PE license or licensure path

Job description

OneEnergy’s mission is to make clean energy the #1 source of electricity for consumers and utilities. We develop solar energy and battery energy storage (BESS) projects across the United States in community solar, distributed generation, and large utility scale project segments.Our diverse project pipeline, multiple locations across the US, and unique multidisciplined team sets us apart.

We are a dynamic and innovative renewable energy industry company committed to excellence, collaboration, and driving positive change in our industry.

About the role

The Sr. BESS Manager, owns OneEnergy's battery energy storage engineering function and is accountable for standing it up as a repeatable, institutional capability. This is a senior, hands-on leadership role for an engineer who has not only designed DG and utility-scale BESS systems but has carried multiple BESS projects through full construction and commissioning cycles. The role mirrors and integrates with OER's established PV processes, tools, and standards; builds the BESS equivalents where they do not yet exist, and operates across Development, Preconstruction, Finance, and Engineering. Reporting to the VP of Engineering and directing future Associate Engineers, the position demands strong interdepartmental coordination, personal initiative, and the judgment to make sound decisions on equipment, cost, and layout designs.

What you’ll do:

• Define and maintain BESS design standards, templates, and workflows (SLDs, layouts, equipment specifications) and keep them current with the team's latest PV standards.
• Establish and enforce a workflow for tracking BESS status, tiering, and prioritization across all company strategies.
• Lead DG and utility-scale BESS plant design; review and approve high-voltage substation, medium-voltage collection, and BESS plant drawing packages at each design stage.
• Lead design and modeling discussions across the engineering team and outside consultants.
• Lead BESS CAPEX methodology: match each commercial opportunity to equipment sizing, guarantees, and warranties, and develop equipment and EPC cost estimates.
• Drive equipment selection and pricing through collaboration with the Preconstruction Team
• Own relationships with key BESS integrators, equipment providers, and contractors.
• Maintain safety standards and keep all documentation current with the latest NFPA 855, NEC (including Article 706, Energy Storage Systems), NESC, and UL 9540 / UL 9540A requirements.
• Lead BESS RFP responses, coordinating internal resources and vendor-provided technical details and assumptions, and reusing and escalating prior material for fast turnarounds.
• Provide feedback on System Impact and Feasibility Studies as needed.
• Serve as the bridge across Development, Preconstruction, Finance, and Engineering, handing off finalized equipment selection and quantities to Engineering for SLDs and layouts.
• Act as an extension of the Development team on community outreach, permitting, and strategic pipeline planning.

Qualifications

• Degree in electrical, mechanical, or a related engineering field.
• PE license, or a clear and near-term path to licensure.
• 6+ years in professional engineering, construction, or land development, with a substantial and recent portion focused on battery energy storage.
• Demonstrated experience taking multiple DG and/or utility-scale BESS projects through full construction and commissioning cycles.
• Direct experience selecting, sizing, and procuring BESS equipment across multiple OEMs and integrators.
• Strong familiarity of NEC (including Article 706), NESC, NFPA 855, and UL 9540 / UL 9540A as applied to energy storage systems.
• Experience leading RFP responses and interconnection and permitting interactions with utilities and AHJs.
• Experience managing internal engineering resources and direct reports, with comfort switching between management and hands-on design work.
• Strong communication and negotiation skills with offtakers, contractors, and internal stakeholders.
• Proficiency establishing equipment specifications to generate final submittals.
• Strong attention to detail, high integrity, and proven organizational capacity to manage multiple projects simultaneously.
• A willingness to contribute to a culture that thrives on building trust and holding one another accountable.
• A “roll up your sleeves and let’s get the job done right” attitude, with demonstrated qualities of integrity, credibility, and professional responsibility.
• Ability to travel and access sites of varying terrain, and an acceptable driving record and active driver's license.

Compensation:

Salary range: $130,000-$200,000, depending on location and experience

OneEnergy’s compensation packages are dependent on an array of factors including, but not limited toskill sets, experience and training, licensure or certifications, geographic location, and otherorganizational needs. We provide generous Paid Time Off (six weeks/year) and an impactful VolunteerTime Off Program. We offer robust employee benefits including comprehensive medical coverage,401(k) matching retirement plan, life insurance, wellness incentives, and more.

We recognize an equitable energy transition requires the participation of diverse communities, groups,and institutions. OneEnergy is an equal opportunity employer and does not discriminate againstotherwise qualified applicants on the basis of actual or perceived race, color, creed, religion, ancestry,citizenship status, age, sex, marital status, sexual orientation, national origin, disability or handicap,veteran status, or any other characteristic protected by applicable federal, state, or local laws.