Field Service Engineer, ES&O

Wärtsilä Energy Storage & Optimization (ES&O) is the leading global energy storage optimizer. Our mission is to deliver integrated energy solutions that build a resilient, intelligent, and flexible energy infrastructure - unlocking the way to an optimized renewable future. By integrating renewables, energy management technology, and storage with traditional energy resources, we reinvent clean energy production from the largest and most complex grids to the most remote and essential microgrids.

We play a key role in Wärtsilä's vision towards a 100% renewable energy future through flexibility, reliability, and integration for a more sustainable world for us all. The position of Field Service Technician / Field Service Engineer will be part the growing Field Service Delivery Team within the Energy Business – Energy Storage & Optimization, Lifecycle Services. The applicant should have a solid understanding of fundamental electrical engineering, project management and construction principals, as well, as experience in high power electrical systems.

We want to transition the world towards a decarbonisedand sustainable future.By pushing the boundaries of engineering and technology, we can make it work. We are always on the lookout for future-oriented talent – want to join the ride?

Field Service Technician / Field Service Engineer – (Battery Energy Storage Systems)

We are seeking dedicated and highly skilled Field Service Technician or Field Service Engineer in Battery Energy Storage systems. The preferred location for this position is Sydney, NSW Australia.

The ideal candidate has a degree in Electrical Engineering or Electrical Trade, and 2+ years of experience with energy storage systems and/or renewable energy, power systems design and communication networks.

Your role and responsibilities

As Field Service Technician / Field Service Engineer in Battery Energy Storage Systems, you will be involved in a dynamic mix of technical and customer-focused tasks. You will perform field service activities, ensuring our battery energy storage systems operate seamlessly. This includes supporting project teams during commissioning, addressing technical issues promptly and proposing improvements to enhance product quality and reduce costs.

Your role will also involve maintaining strong relationships with customers through effective communication and service, preparing detailed analytical reports and acting as a technical advisor during customer meetings. You will spend at least 50% of your time on-site, directly engaging with customers and resolving issues hands-on.

What you will do:

• You perform field service activities as per long-term service agreements.
• You conduct BESS planned and unplanned maintenance.
• You support project teams during commissioning of battery energy storage systems.
• You address and report warranty and technical issues and propose product improvements.
• You maintain customer relationships through effective communication.
• You prepare and present service reports with recommendations.
• You act as a technical advisor to customer meetings.
• You write service work reports and maintain documentation.

Requirements for the position:

• Bachelor's Degree in Electrical Engineering or equivalent Electrical Trade.
• Valid A Grade NSW Electrical license.
• Preferably 2 to 4 years' experience in battery energy storage systems, renewable energy, power systems design and communication networks.
• You have knowledge of LV and MV systems, EMS, battery modules, inverter technology, online platform communication systems, industrial networks and protocols, PLC and control systems, PV systems, protection relays, variable frequency drives, HVAC, fire alarm and suppression systems, advanced firewall and router programming, AS/NZS 3000:2018 electrical installations.
• You have experience in HV Switching Operations.
• You have experience in BESS or Renewable Energy installation, maintenance, troubleshooting and commissioning.
• You are detail-oriented, have a project management mindset, good collaboration skills, proficient in MS Office, excellent report writing and communication skills.
  • A valid driver's license.
  • Willingness to travel at least 70% of the time.
  • Must be authorized to work in Australia without sponsorship.
  • Relocation not applicable for internal employees.

Why you and us

You are valuated – as your true self. At Wärtsilä we value diversity and are committed in supporting inclusive work community.

Your growth is supported. We believe in continuous learning & teamwork. Wärtsilian community has your back when it comes to development opportunities – so you can develop beyond your potential.

You get to make a difference. Innovation and sustainability are important for us. Every day, we put our hearts and minds into enabling sustainable societies through innovation in technology and services into reality.

Contact & next steps

Submit your application before the deadline through our Careers portal. Applications through email will not be considered. After submitting your application you'll receive a confirmation email. We try our best to get back to everyone within 2-3 weeks after application deadline.

Please apply by10/09/2025at 23:59 Australian Standard Time. Our recruiting tool recognizes the time zone where the job ad has been published and closes the application period according to same time zone.

Last application date: 10/09/2025

At Wärtsilä we value, respect and embrace all our differences, and are committed to diversity, inclusion and equal employment opportunities; everyone can be their true self and succeed based on their job-relevant merits and abilities.

This is Wärtsilä

Wärtsilä is a global leader in innovative technologies and lifecycle solutions for the marine and energy markets. Our team of 17,800 professionals, in more than 280 locations in 79 countries, shape the decarbonisation transformation of our industries across the globe. Read more on www.wartsila.com. #LI-SN1 #fuelyourpower #LI-Hybrid