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About the Role
Lead technical and commercial advisory services for utility-scale battery energy storage systems (BESS) across development, procurement, contracting, delivery, and operation. Focus on Owner's Engineer and procurement engagements, providing clear advice on BESS sizing, specification, evaluation, and contracting to achieve intended duty over its operating life. Requires technical depth and commercial judgment to translate understanding into bankable requirements, bid comparisons, and risk allocation.
Responsibilities
- Lead BESS Owner's Engineer and technical advisory engagements across feasibility, procurement, contracting, design, construction, commissioning, and operation.
- Establish BESS sizing and performance basis using intended dispatch duty, grid requirements, site climate, operating strategy, reliability requirements, and lifecycle objectives.
- Prepare and review Principal's requirements, technical schedules, and guarantees covering net power, usable energy, round-trip efficiency, availability, auxiliary consumption, degradation, augmentation, throughput, response performance, and reactive-power capability.
- Lead tender evaluations and normalize competing offers by interrogating assumptions, exclusions, operating limits, warranted curves, design margins, augmentation strategies, lifecycle costs, and technical risks.
- Support contract negotiations on performance guarantees, test and acceptance methods, warranties, liquidated damages and remedies, scope interfaces, long-term service obligations, operations and maintenance, and augmentation responsibilities.
- Review BESS architecture and interfaces across cells, modules, racks, containers, battery management systems, energy management or plant control systems, power conversion systems, medium-voltage systems, thermal management, fire safety, and the grid connection.
- Coordinate specialists and mentor team members.
Requirements
- Experienced BESS engineer or technical advisor with a demonstrated record in utility-scale battery projects.
- Strong understanding of both technical performance and commercial delivery.
- Experience developed with an owner, developer, OEM, system integrator, EPC contractor, lender, investor, or engineering consultancy.
- Ability to move confidently between system sizing, technical specifications, vendor proposals, and contract schedules.
- Understanding that BESS offers cannot be compared reliably without aligning duty, system boundaries, ambient conditions, degradation assumptions, augmentation strategy, warranty limits, test methods, and the definition of net performance.
- Experience supporting competitive procurements and contract negotiations.
- Familiarity with BESS project components from cells and racks through battery management systems, thermal management, power conversion systems, energy management or plant control systems, medium-voltage systems, and the grid connection.
- Understanding of how design, safety, site conditions, operating strategy, and contractual obligations interact over the project life.
- Ability to identify where detailed specialist input is required and coordinate technical and commercial contributors to reach a defensible client recommendation.
- Significant experience (8+ years) in the energy sector, including substantial hands-on experience with utility-scale BESS projects across development, procurement, delivery, or operation.
- Background and experience working in consulting, developer, OEM, integrator, or EPC industries.
- Strong capability in BESS sizing and operating-duty definition, including power and energy requirements, AC and DC boundaries, state-of-charge windows, duration, C-rate, cycling, throughput, degradation, and augmentation.
- Detailed understanding of BESS performance criteria and guarantees, including net power, usable energy, round-trip efficiency, auxiliary consumption, availability, response, thermal derating, degradation, warranty limits, and acceptance testing.
- Demonstrated experience preparing or reviewing procurement documentation, evaluating and normalizing bids, undertaking technical due diligence, assessing departures, and supporting commercial negotiations.
- Sound understanding of BESS technology and interfaces across cells, modules, racks, battery management systems, power conversion systems, energy management or plant control systems, medium-voltage balance of plant, grid connection, thermal management, and fire safety.
- Experience with factory acceptance testing, site acceptance testing, commissioning, capacity or efficiency testing, and verification of contractual performance requirements is highly regarded.
- Commercial acumen and the ability to assess lifecycle value, risk allocation, warranties, performance remedies, long-term service agreements, operations and maintenance obligations, and augmentation strategy.
- Strong client engagement and communication skills, with the ability to advise, influence, and build trusted relationships across technical, procurement, commercial, and executive teams.
- Either registered, or working towards professional registration, on the National Engineering Register in Australia (such as RPEV or RPEQ), ideally supported by Chartered Professional Engineer (CPEng) status or equivalent international accreditation.
- A bachelor degree in electrical engineering, power systems, or another engineering discipline relevant to battery energy storage systems.
Skills
- Technical and commercial advisory services for utility-scale battery energy storage systems
- Owner's Engineer engagements
- Procurement engagements
- BESS sizing and specification
- BESS evaluation and contracting
- System sizing
- Technical specifications
- Vendor proposals
- Contract schedules
- BESS performance criteria and guarantees
- Procurement documentation preparation and review
- Bid evaluation and normalization
- Technical due diligence
- Commercial negotiations
- BESS technology and interfaces
- Factory acceptance testing
- Site acceptance testing
- Commissioning
- Capacity or efficiency testing
- Performance requirement verification
- Commercial acumen
- Lifecycle value assessment
- Risk allocation
- Warranties
- Performance remedies
- Long-term service agreements
- Operations and maintenance obligations
- Augmentation strategy
- Client engagement
- Communication skills
- Advising
- Influencing
- Building trusted relationships
- Electrical engineering
- Power systems
- Battery energy storage systems
Location
- AU - Sydney, NSW
- Hybrid
Work Type
- Hybrid
Experience Level
- 8+ years in the energy sector
- Substantial hands-on experience with utility-scale BESS projects
Education Level
- Bachelor degree in electrical engineering, power systems or another engineering discipline relevant to battery energy storage systems
Benefits
- Flexible work arrangements
- Purchase up to 6 weeks additional annual leave per year
- Volunteer and representation leave
- Flex public holidays
- Access to industry-leading technology and thinking
- Transformational work with big impact
- Work flexibility
- Robust global well-being program
About the Company
- AECOM's Energy practice provides a wide range of services from consulting and engineering design to energy engineering, energy procurement and construction (EPC) for power, energy efficiency, developer and renewable energy clients.
- AECOM is the world’s trusted infrastructure consulting firm, delivering professional services throughout the project lifecycle – from advisory, planning, design and engineering to program and construction management.
- On projects spanning transportation, buildings, water, new energy and the environment, AECOM's public- and private-sector clients trust them to solve their most complex challenges.
- AECOM teams are driven by a common purpose to deliver a better world through their unrivaled technical and digital expertise, a culture of equity, diversity and inclusion, and a commitment to environmental, social and governance priorities.
- AECOM is a Fortune 500 firm and its Professional Services business had revenue of $16.1 billion in fiscal year 2025.
- AECOM is committed to delivering sustainable legacies for generations to come.
Equal Opportunity
- Everyone belongs at AECOM
- Committed to diversity, equity, inclusion, and belonging
- AECOM is proud to be a Fortune 500 Most Admired Company, a WGEA Employer of Choice for Gender Equality, #Work180 Equitable Workplace Awards 2025 Winner and an AWEI Bronze Tier LGBTQ+ Inclusive Employer.
- We welcome applications from individuals of all backgrounds, including those with disabilities, additional health or mental health needs, and/or neurodiverse conditions.
- As an Equal Opportunity Employer, we believe in each person’s potential, and we’ll help you reach yours.