Senior BESS Engineer

Overview

You will lead the technical delivery of battery energy storage systems for standalone and solar-co-located projects, ensuring design, procurement, construction, commissioning and operation meet performance guarantees. You will shape BESS architectures, interfaces and standards while mentoring teams and coordinating with grid, development and asset management stakeholders. This role offers impact across technology roadmaps, supplier governance and project execution at scale. Join to drive safe, efficient storage that supports renewable integration and grid reliability.

Responsibilities

• Define BESS technical requirements and sizing (MW/MWh, duration, AC/DC coupling, augmentation strategy).
• Define interfaces between BESS and co-located solar PV systems.
• Provide input into grid connection applications, studies and DNO/NESO engagement.
• Develop and maintain BESS technical specifications and reference designs.
• Technically evaluate BESS suppliers and integrators (cell chemistry, PCS, thermal, fire safety, warranties, degradation, RTE guarantees).
• Support contract negotiations (supply, EPC, LTSA) with technical schedules and requirements.
• Develop technology and pricing roadmaps using market feedback; monitor technology developments and bankability.
• Establish BESS technical standards, best practices and mentor colleagues.
• Review contractor designs, acceptances, site inspections and commissioning.
• Witness Taking Over, IAC and FAC testing including capacity and RTE; manage defects and gaps.
• Provide input on variations, delays and contractual claims.
• Monitor performance: availability, capacity retention, state of health, RTE, auxiliary consumption and alarms.
• Manage warranties, degradation claims and O&M/LTSA provider performance; support optimization and trading strategies.
• Assist with spares, augmentation and end-of-life planning.
• Ensure compliance with UK standards, regulations and battery fire-safety requirements; report risks to stakeholders.

Key requirements

• 5+ years in utility-scale BESS engineering spanning design, procurement, construction and/or operations.
• Strong understanding of BESS architecture (cells, racks, PCS/inverters, transformers, EMS/BMS/SCADA, thermal, fire protection).
• Knowledge of BESS performance metrics and guarantees (availability, degradation, RTE, auxiliary consumption).
• Experience reviewing contractor designs and witnessing factory, site and commissioning tests.
• Knowledge of battery safety standards (IEC, UL, NFPA 855 or equivalent).
• Ability to analyse operational data and provide clear technical recommendations; strong cross-functional collaboration.

• strong collaboration across grid, contracts, development and asset management
• clear communication and decision-making
• problem-solving and proactive risk management
• BESS architecture (cells, racks, PCS/inverters, EMS/BMS/SCADA, thermal management, fire protection)
• grid connection studies and technical interfaces with solar PV
• contract technical risk assessment and a roadmap mindset

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