Diesel Generator Service Engineer

WB Power Services Ltd; Slough; On-site; GBP 55,000 - 65,000; Full time

Benefits offered by this job

Competitive hourly rates

OTE £55,000 - £65,000

Overtime after 40 hours

33 days' holiday

Private healthcare

Death in service

Career progression

Employee Assistance Programme

Job summary

Rehlko is seeking a Generator Service Engineer to support critical power infrastructure at fixed customer sites, mainly data centres. You will perform preventative maintenance, diagnose faults, and carry out repairs to maximise uptime and reliability.

Ideal candidates have time-served mechanical/electrical backgrounds or NVQ Level 3, with knowledge of engines and alternators. The role involves on-site work, on-call duties, and strict adherence to safety standards.

Qualifications

• Time-served Mechanical/Electrical Engineer or NVQ Level 3 (or equivalent).
• Experience working on generators or critical power systems is highly advantageous.
• Good knowledge of mechanical and electrical systems, including engines and alternators.
• Experience in data centres, critical environments, facilities management or industrial settings is beneficial.
• Strong fault-finding and diagnostic skills.
• Able to complete risk assessments and work safely in high‑compliance environments.
• Excellent communication skills, liaising with customers, site teams and internal stakeholders.
• Comfortable in a fast-paced environment where reliability and attention to detail are critical.

Responsibilities

• Carrying out planned preventative maintenance and reactive repairs on standby power generation equipment within data centre environments.
• Diagnosing faults and completing breakdown repairs to ensure maximum equipment reliability and uptime.
• Working on fixed customer sites, supporting critical power infrastructure and emergency backup systems.
• Building strong working relationships with site teams and customers, delivering a professional and responsive service.
• Working closely with Coordinators and Service Managers to ensure maintenance schedules and reactive works are completed efficiently.
• Accurately recording all work carried out using our bespoke management system.
• Participating in the site or regional on-call rota (approximately 1 in 6).
• Adhering to company Health & Safety, environmental and quality management systems at all times.

Skills

Mechanical/Electrical Engineer

Fault-finding

Diagnostic skills

Communication skills

Safety compliance

Education

NVQ Level 3 in Engineering

Job description

About Rehlko

Rehlko is a global leader in power and energy resilience. Formerly known as Kohler Energy, Rehlko has continually shaped the way the world powers homes, industries, and critical infrastructure.

As part of this exciting growth, WB Power Services has now become Rehlko. This transition marks our evolution into an OEM, allowing us to design, build, and deliver complete power solutions from the ground up. It’s a transformation that strengthens our technical capability, expands our product range, and deepens the value we offer to our clients.

We retain the strong, values-led foundation of a family business, while being empowered by the scale, resources, and global vision of Rehlko. For our people, this means new opportunities, bigger projects, and a chance to shape the future of resilient, sustainable energy.

We're looking for a Generator Service Engineer to support critical power infrastructure within data centre environments. Working predominantly from fixed customer sites, you'll play a key role in maintaining standby power systems, ensuring equipment reliability and maximum uptime across mission‑critical facilities.

The Role

• Carrying out planned preventative maintenance and reactive repairs on standby power generation equipment within data centre environments.


• Diagnosing faults and completing breakdown repairs to ensure maximum equipment reliability and uptime.


• Working on fixed customer sites, supporting critical power infrastructure and emergency backup systems.


• Building strong working relationships with site teams and customers, delivering a professional and responsive service.


• Working closely with Coordinators and Service Managers to ensure maintenance schedules and reactive works are completed efficiently.


• Accurately recording all work carried out using our bespoke management system.


• Participating in the site or regional on-call rota (approximately 1 in 6).


• Adhering to company Health & Safety, environmental and quality management systems at all times.

The Person

• Time-served Mechanical/Electrical Engineer or qualified to NVQ Level 3 (or equivalent).


• Previous experience working on generators, critical power systems or similar equipment is highly advantageous.


• Good knowledge of both mechanical and electrical systems, including engines and alternators.


• Experience working within data centres, critical environments, facilities management or industrial settings would be beneficial.


• Strong fault-finding and diagnostic skills.


• Able to complete risk assessments and work safely in high‑compliance environments.


• Excellent communication skills, confident liaising with customers, site teams and internal stakeholders.


• Comfortable working in a fast‑paced environment where reliability and attention to detail are critical.

What We Can Offer You

• Competitive hourly rates, dependent on experience.


• Overtime available after 40 hours, with a realistic OTE of £55,000 - £65,000.


• 10-15% uplift in base pay, depending on your postcode.


• On‑call standby allowance.


• 33 days' holiday, including bank holidays.


• Training and upskilling opportunities.


• Private healthcare.


• Death in service benefit.


• Excellent long‑term career progression opportunities.


• Access to our Employee Assistance Programme