Commissioning engineer: how to train and review the role
Tests and energises solar, wind, battery, substation or EV charging systems before handover. Checks wiring, protection, communication and performance, signs the commissioning record and resolves defects. Reports to the project manager or head of commissioning.
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Share your requirementsWho usually fills this role
Usually diploma or degree engineers in electrical or electronics, often from site engineer or service jobs. Some come from the equipment maker. At hiring, test circuit and protection knowledge, reading of single-line diagrams, test instrument use, clear report writing and the habit of stopping when something is unsafe.
Skills ladder
Stage 1
New joiner
- Check installation against drawings and list mismatches
- Use meters and testers under supervision
- Record readings on the commissioning sheet accurately
- Follow lock-out and isolation steps
Stage 2
Independent
- Run a standard commissioning on their own and sign the record
- Diagnose common faults in strings, inverters, protection and communication
- Raise defects with contractors with clear photos and notes
- Brief the customer on operation and basic safety
Stage 3
Senior or lead
- Commission complex or large sites and lead the team
- Judge when it is unsafe to energise and hold the line
- Review others' records and find gaps
- Feed field problems back to design and procurement
Training path
First weeks
- 1
Safety and isolation procedures
The safety officer teaches lock-out, tag-out, earthing, arc hazards and permits. The joiner repeats the steps in a demonstration, and the officer signs before any energised work.
- 2
Drawings and system basics
A senior engineer explains single-line diagrams, protection schemes and equipment ratings. The joiner traces the layout on a live site and explains what each part does.
- 3
Instruments and recording
The senior shows insulation testers, clamp meters, earth testers and loggers. The joiner takes readings under supervision, and the senior compares them with his own.
- 4
Commissioning sheet
The head of commissioning explains each line of the sheet and what a pass or fail means. The joiner fills the sheet on a shadowed job, and it is checked line by line.
First year
- 1
Independent standard jobs
The engineer commissions standard sites with a senior reviewing sheets and a sample of tests. Differences between the engineer's and the reviewer's findings are discussed.
- 2
Fault finding
The senior teaches a method to isolate faults in strings, inverters, protection and communication. The engineer writes the cause and fix for each case.
- 3
Working with contractors
The engineer learns to give defect lists with photos and follow up. The project manager reviews the clarity of the lists and the closure time.
- 4
Customer handover
The engineer practises explaining how to operate and watch the system, and what to avoid. A senior sits in and gives feedback.
Towards senior
- 1
Complex and large sites
The head gives the engineer a larger or hybrid system and reviews the test plan and the sign-off decision. Differences between the plan and what happened on site are discussed and written down for the next job.
- 2
Review of records
The engineer checks others' commissioning sheets for gaps and reports patterns to the head. The engineer checks other engineers' commissioning sheets for missing readings, unclear photos and unsigned lines, and reports the patterns to the head of commissioning.
- 3
Feedback to design and procurement
The engineer collects repeated field defects and presents them to design and procurement with proposed fixes. The engineer collects repeated field defects and presents them to design and procurement with photos, causes and proposed fixes, then tracks whether they were adopted.
- 4
Mentoring
The senior takes a junior engineer on sites and reviews his sheets and safety decisions, with the head checking the mentoring notes.
Performance review
A monthly one-to-one with the head of commissioning or project manager using sheets and defect lists, and a written half-yearly review. A joint site visit each quarter shows decisions in practice.
What to measure
| Measure | How it is seen |
|---|---|
| Test accuracy | Sample of readings compared by a second engineer, and sheet completeness. |
| Safety decisions | Permits, isolation records and incidents, including cases where the engineer delayed energising for safety. |
| Fault diagnosis | Defect log showing cause, fix and time to close. |
| Report quality | Commissioning sheets and defect lists read for clarity and photos. |
| Contractor and customer handling | Feedback from contractors and customers about clarity and respect. |
| Learning and sharing | Notes shared with design or other engineers on repeated problems. |
Evidence to bring
- Commissioning sheets
- Defect list and closure record
- Permit and isolation records
- Customer handover notes
Questions to ask in the review
- Which site was the hardest to commission and why?
- Did you ever refuse to energise, and what happened?
- Which faults repeat the most?
- How accurate do you think your readings are, and how do you check?
- What do contractors find unclear in your defect lists?
- What did customers ask at handover that you could not answer?
- Which equipment do you want training on?
- What would make your sheets easier to review?
Pitfalls
- Pushing engineers to energise to meet a date, so safety decisions are overruled.
- Reviewing only the number of sites commissioned.
- No second-person check of readings.
- Not giving the engineer a way to feed repeated defects back to design.
Questions about this role
Make it a written rule that safety stops are respected, record the reasons and review them without blame. Customers and managers should know this in advance.
Yes. The principles of safe energising are shared, but oil and gas work involves process systems, hazardous areas and different permits. Keep the ladder and change the technical modules.
Keep the commissioning sheet, instrument details, permits and photos for each site. Confirm retention periods and any statutory requirement with your adviser.