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Commissioning Engineer

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Do you want to work to make Power for Good?

We're the world's largest independent renewable energy company. We're driven by a simple yet powerful vision: to create a future where everyone has access to affordable, zero carbon energy.

We know that achieving our ambitions would be impossible without our people. Because we're tackling some of the world's toughest problems, we need the very best people to help us. They're our most important asset so that's why we continually invest in them.

RES is a family with a diverse workforce, and we are dedicated to the personal professional growth of our people, no matter what stage of their career they're at. We can promise you rewarding work which makes a real impact, the chance to learn from inspiring colleagues from across a growing, global network and opportunities to grow personally and professionally.

Our competitive package offers rewards and benefits including pension schemes, flexible working, and top-down emphasis on better work-life balance. We also offer private healthcare, discounted green travel, 25 days holiday with options to buy/sell five days per annum, enhanced family leave and four volunteering days per year so you can make an impact somewhere else.

Job Purpose

RES currently provides High Voltage Operations and Maintenance (HV O&M) Services to renewable energy assets in the UK & Ireland. Due to increased demand from our clients, we are seeking a Commissioning Engineer (CE) to grow and expand this service.

The Commissioning Engineer role will be site based across our portfolio of onshore & offshore wind, solar & battery storage sites, performing maintenance, installation, and commissioning duties, with home/office-based working for preparations and reporting writing.

RES are looking for an experienced Commissioning Engineer who can undertake site installations, protection maintenance, protection defect rectification and general commissioning activities across our portfolio at all voltages preferably up to 400KV. 

As this role is based across our UK&I portfolio, the successful candidate must be willing to travel around the UK to various sites, so they must have a full UK driving license. However, preparation & report writing will be based either from home or a UK office.


The responsibilities of the Commissioning Engineer include:

  • To ensure a safe and healthy working environment for themselves and others, at office or site locations. Operating to site requirements, project method statements and risk assessments, and RES HV safety rules.
  • Supervising/performing of commissioning activities on switchgear, transformers, generation (or storage) assets and related equipment on both AC & DC systems.
  • Carry out protection and control testing on generation (or storage), HV & LV assets to diagnose any faults and organise repairs.
  • Carry out wiring modifications and retrofit upgrade to sites where protection systems may have issues.
  • Attend site and interact with suppliers, construction teams, sub-contractors, and grid connection providers to ensure safe and successful commissioning programme.
  • Perform SAT, system start-up testing and co-ordination with utilities for energisation of interconnection.
  • Undertaking FAT, including reviewing of procedures, attending FAT and adjusting commissioning tasks to integrate FAT successes and deficiencies.
  • Ensuring as-built drawings/documents are marked up correctly and updated where necessary.
  • Tracking and resolving issues by working with HV SAPs/ project managers and any sub-contractors.
  • Coordinating the delivery of contestable/non-contestable grid connections.
  • Be involved in the tendering process for new renewable sites and providing input into commissioning aspects.
  • Provide in house training and support to our HV SAP team to widen the scope of the business’s abilities for our clients.



  • Detailed knowledge of commissioning practices and testing
  • Ability to provide technical support and guidance.
  • Knowledge of the key legislation underpinning UK high voltage electrical asset operation and maintenance
  • Detailed knowledge of UK industry HV electrical safety rules


  • Knowledge of solar farm assets



  • Ability to provide in house training to new starters (testing).
  • Excellent communication and people skills.
  • Ability to coordinate multiple activities whilst ensuring safety and quality are maintained.
  • Ability to identify problems, conduct analysis and develop solutions.


  • Knowledge of relay computer software



  • Experienced Commissioning Engineer / Commissioning Manager.
  • Experience commissioning primary and secondary plant.
  • Commissioning and fault finding HV plant and equipment.
  • HV protection testing
  • Experience of HV & LV equipment.
  • Complex Protection relay testing and commissioning.



  • Commissioning Engineer
  • SAP authorisation / previously held SAP authorisation under high voltage electrical safety rules
  • Relevant Degree/HND or equivalent industry experience
  • NEBOSH General Certificate
  • Full UK driving licence


  • TP141 authorisation
Closing Date

Please be advised that the closing date for applications for this role is Friday 19th May 2023.

At RES we celebrate difference as we know it makes our company a great place to work. Encouraging applicants with different backgrounds, ideas and points of view, we create teams who work together to solve complex problems and design practical solutions for our clients. Our multiple perspectives come from many sources including the diverse ethnicity, culture, gender, nationality, age, sex, sexual orientation, gender identity and expression, disability, marital status, parental status, education, social background and life experience of our people.


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Services HV Services - 417


  • United Kingdom, England, Home Worker

Employment type

Permanent Full Time

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