Mitie Cleaning & Hygiene Services
Senior Commissioning Engineer

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SENIOR COMMISSIONING ENGINEER
Mitie Power & Grid brings together three ICP business units—G2 Energy, ESM Power, and Rock Power Connections—alongside Custom Solar, the UK's leading behind-the-meter solar PV installer. With over 400 specialist professionals across our ICP and solar teams—and access to thousands more engineering experts within Mitie—we are one of the UK's largest and most experienced providers of grid connection and renewable energy services. We offer a comprehensive suite of specialist services across grid application, design, equipment procurement, installation, testing, commissioning and ongoing operations and maintenance. Our focus is on supporting decarbonisation through projects including utility-scale solar, wind, battery energy storage (BESS), and EV infrastructure.
We are currently recruiting for a Senior Commissioning Engineer to join our Rock Power Connections Technical Operations team.
This is your role. What part will you play?
To act as Commissioning Engineer undertaking commissioning activities / duties on a wide range of distribution power system plant, control and protection and other substation equipment to a high level of competence.
Responsibilities
Health, Safety, Environmental & Quality:
- Attend company authorisation / induction courses as required by Mitie Power & Grid
- Ensure that personally held test equipment is maintained in good working order and within calibration and to issue for re-calibration within appropriate time scales
- Maintain a safety & zero lost hours culture for all related site activities through good housekeeping, adhering to site safety rules, wearing correct PPE, proactively identifying safety and environmental improvements, offering solutions to issues and corrections to hazards (if appropriate) and applying company specific safety rules.
Testing & Commissioning
- Be flexible to travel across the UK when required with fair and reasonable notice
- To attend Commissioning Panel Meetings as required
- To take the role of Lead Commissioning Engineer on designated projects, coordinating and managing commissioning activities, whilst acting as a focal point for the customer
- Completion of Commissioning Inspections, off load commissioning and on load commissioning as identified under the relevant DNO/IDNO Procedures
- To prepare and collate commissioning documentation to be incorporated in to final project folders such as drawing mark-ups and test data / documentation
- To fulfil Commissioning Panel duties within competency e.g., production of commissioning programmes, commissioning method statements, inspection schedules, etc, within specified time scales
- To undertake and complete testing and final commissioning on a wide range of plant and equipment at various voltage levels including fault investigation, diagnostic activities and rectification of faults within competence in accordance with the client's specification and documentation
- To participate, undertake and support FAT's
- To support apprentice commissioning engineers as required and to act as a role Model Staff Development
- To identify and inform Head of Technical Operations when specific product related training is required in order to satisfactorily complete commissioning activities
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Day-to-Day Control
- Provide technical support and direction, within their competence, to Rock Power Connections Project Team members, including the application of technical standards
- To liaise and work with internal and client Design Engineers to resolve design related queries
- To undertake other activities which the Company may reasonably require to be undertaken on a temporary basis which are within an individual's area of competence
- To report progress and/or problems to the Site Manager or Operations Manager / Engineer responsible for project delivery
- Assist & support the Field team - technical queries, quality plans, project commissioning programs, RAMS & EHS (Environmental Health & Safety) objectives
Role Requirements
- Working Safely or equivalent i.e. Safety Passport
- HNC / Degree in electrical engineering
- DNO Competent Person
- Knowledge of CDM regulations
- Demonstrable extensive experience working as a Commissioning Engineer in Electricity Supply Industry with exposure to LV, MV, HV & voltage schemes
- Demonstrable comprehensive experience of working on a range of protection schemes and protection relays, DC systems, AC systems including primary and secondary injection testing of complex protection schemes.
- Demonstrable comprehensive experience of working on various types of power plant and equipment.
- Proven fault-finding experience
- Understanding of permit control & Isolations for a variety of clients such as NGED, SSE etc
Who are Rock Power Connections?
Since our acquisition by the Mitie Group in 2022, we have completed some of our biggest projects to date. These include the installation of EV charging stations at some of the UK's busiest hubs and partnerships with high profile clients such as hi-speed rail network HS2 and Electric Highway Gridserve, whilst continuing to support and grow our long-standing place on the NGED (formerly WPD) framework agreement to deliver new substations, carry out asset replacement and reinforcement works from 11kV through to 132kV
Having the right people and culture has always been key to our success. Rock would not be where it is today without them. If we do say so ourselves, our employee value proposition is fantastic in terms of benefits, packages, learning and development. Our focus continues to be on quality skills and training, and we believe that the Mitie brand combined with our family friendly ethos gives us that competitive edge.


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Our Commitment To Diversity
Lucky for us, we are not all the same. Through diversity we generate power. We run on inclusion and our combined creative energy is fuelled by over 130 nationalities. Rock Power Connections celebrates character – no matter what ethnic background, gender, age, religion, identity, or disability. We energize society, all of society, and we celebrate our differences.
Our market-leading offering provides you with benefits that suit your lifestyle.
- We have a virtual GP on hand for you and members of your household. So you can get expert advice by video or phone without having to leave your home.
- We offer financial wellbeing assistance through our Salary Finance scheme. For example, you could access 50% of your earned pay before payday for a small fee. Salary Finance also offers competitive loans.
- When you join us, we’ll give you a link to our flexible lifestyle benefits platform, Choices. You might choose to purchase up to five extra days’ holiday each year. You might buy critical illness insurance, seek dental treatment or buy technology products at an affordable cost. There are many choices!
- We give you access to high street discounts from thousands of well-known retailers, gyms and more through our MiDeals platform. And we have a cycle-to-work scheme.
- Life cover of up to four times your salary is available. We also offer enhanced pension contributions, a save-as-you-earn scheme, and a Mitie Matching Share Plan (you could even be awarded free shares in Mitie).
- We award our employees with Mitie Stars as recognition for their hard work. There are cash prizes up for grabs each month and at the end of the year there’s a chance to scoop a top prize of £10,000!
Our success is a direct result of the experience and quality of our people. Progressing your career is therefore a top priority for us. We offer a diverse variety of training and development avenues via a wide selection of learning resources to suit you.
We are committed to ensuring our recruitment process is inclusive and accessible to all. If you have a disability or long-term condition (for example dyslexia, anxiety, autism, a mobility condition or hearing loss) and need us to make any reasonable adjustments, changes or do anything differently during the recruitment process, please let us know by emailing Maria O'donohue at maria.odonohue@mitie.com.
Since 1987, Mitie’s 84,000 employees have been maintaining companies globally. We are the UK’s leading facilities management and professional services company, and our clients range from household names in banking, critical government sites as well as hospitals and schools.
Join our Mitie Team.
Together our diversity makes us stronger.
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