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Commissioning & Energisation

Dead testing, energisation by the network operator, then proving every unit charges a real vehicle and takes a real payment - because a charger that delivers energy but cannot bill for it is not a finished charger.

Last updated 2026-09-06

Typical duration

Typically 1-3 weeks from energisation to takeover on a mid-sized scheme, though the network operator's energisation date, connectivity problems and back-office configuration drive the timescale far more than the testing itself.

What is Commissioning & Energisation?

Commissioning runs in a fixed order and the order is set by safety. Everything is proved dead first. Then the distribution network operator energises at the connection point, on its date and under its control. Then the installation is brought up in stages - supply, distribution, controls, communications - and only then are the units themselves powered on. From that point the site is worked progressively harder: a unit is proved to power up, then to talk, then to charge, then to charge properly across the connector types it is specified for, then to charge several vehicles at once with the load management doing what it was designed to do.

What surprises people who have come from other sectors is the second half. On a building, commissioning ends when the plant runs. On a charging site the plant running is the halfway point, because the product is not electricity, it is a transaction. Every unit has to be reachable by the client's operator, appear correctly in the back office, carry the right tariff, accept payment through the terminal and through whatever apps and roaming arrangements the operator supports, start and stop remotely, report its own faults and produce a billing record that reconciles with the energy actually delivered. A charger that charges but cannot take payment is a charger the client cannot open, and it fails in a way that is entirely invisible to an electrical test.

The handover is a system handover rather than a building one. Nobody stands on a charging site. The operator inherits units it will never touch, controlled through software from somewhere else, and what it actually receives is a set of records, a set of credentials, a fault escalation route and a maintenance obligation. As-built drawings, test results, verified settings, unit and circuit schedules, connectivity and account ownership, spares, warranty terms, training and the emergency isolation arrangements all have to be complete and consistent, because the person diagnosing a dead bay in three years will have none of the context the commissioning team has today.

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Method comparison graphic coming soon

When and why is Commissioning & Energisation used?

Commissioning begins as soon as sections of the installation are complete enough to be tested and it ends when the client's operator formally takes the site over. The sequence is not negotiable: nothing is energised until it has been proved dead and correct, nothing is loaded until the protection has been proved, and nothing opens to the public until it has been proved to charge and to bill. The reason so much of the effort concentrates here is that a charging site has almost no moving parts and enormous dependence on configuration - the units do nothing useful unless the settings, the tariff, the connectivity, the metering and the back office all agree with each other and with what the client sold. Commercially this is the stage everything has been building towards, because the energisation date, the opening date and the start of revenue all hang on the distribution network operator's programme and on the operator's tests being passed. It is also the stage where earlier shortcuts surface: a mislabelled circuit, an unrecorded serial number, an unproven signal path or a missing test sheet turns into days of investigation exactly when there is no float left. Sites that commission smoothly are almost always sites that recorded properly while they were being built.

Types of Commissioning & Energisation

Explore each method in depth - benefits, limitations, plant and quality control on its own page.

Energisation by the distribution network operator

The operator closes its connection and makes the supply live, on its date, under its control and after its inspections have been satisfied. It is the one milestone the project cannot influence on the day, which is why everything else is arranged around it and why the evidence pack is submitted well in advance.

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Electrical commissioning and functional testing

Proving the installation itself once it is live - protection operating as declared, circuits energising the right units, isolation and emergency arrangements working, metering reading correctly. Methodical, unglamorous and the part that determines whether everything after it goes smoothly.

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Charging and payment proving

Testing every unit with a real vehicle and a real transaction, across the connector types and payment routes the site is specified for. It is the only test that proves the product works as a customer will experience it, and it routinely finds things no electrical test would.

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Back-office, load management and remote operation proving

Demonstrating that the site can be run from somewhere else: units visible and controllable in the operator's system, tariffs applied, load management sharing capacity as designed, faults reported automatically and billing records reconciling with delivered energy.

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Best suited for

  • Public rapid hubs opening to an advertised date, where payment and back office must work from the first customer
  • Depot and fleet schemes commissioned overnight around a working fleet that must still leave in the morning
  • Retail and leisure sites where the client's operator takes over a site nobody will ever staff
  • Load-managed and capacity-limited schemes where the control behaviour is the thing being bought
  • Portfolio rollouts where a repeatable commissioning and handover pack is applied across many sites

Commissioning & Energisation: step by step

  1. 1

    Step 1: Assemble the evidence and hold the readiness review

    Before energisation is discussed the installation is reviewed as a whole. Test records from the earlier stages are collated and checked for completeness rather than for existence. Drawings, settings schedules, supplier procedures and the commissioning programme are confirmed as current revisions. Outstanding work is listed honestly and each item assessed for whether it prevents energisation or merely needs finishing. Whatever the distribution network operator requires as a condition of energising is confirmed as submitted and accepted, not assumed. The safety regime for the site is put in place: who issues permits, how isolations are proved and locked, and where the boundary sits between what will be live and what is still under construction. Readiness is a decision with a name against it.

  2. 2

    Step 2: Complete dead testing and set the safety regime

    Any remaining testing is completed with the installation safely de-energised, and physical checks accompany it - covers and barriers fitted, compound secure, temporary works and tooling removed, trenches reinstated, access and escape clear, labelling complete and matching the drawings. The permit system goes live and the site is divided clearly between energised and non-energised areas, with physical demarcation and signage so anyone working elsewhere knows exactly where the boundary is. Everyone on site is briefed on what is about to change, including the client's staff and the site operator's people, who have spent months walking past this equipment while it was dead. On a project that has run as an ordinary construction site, that cultural shift is the most important thing the commissioning team does.

  3. 3

    Step 3: Energise with the distribution network operator

    First energisation happens on the operator's terms, at the agreed time, with its inspections satisfied and its people present or in control. The switching sequence is written, checked and briefed in advance with clear responsibility for every operation and a clear line of communication between the site and the operator. The installation is energised progressively rather than all at once, with checks between steps - a thermal survey, a look for anything unexpected in the way of noise, heat or smell, and confirmation that protection and metering are reading what they should. Nothing here is improvised. If a check is not satisfied the sequence stops, and the discipline to stop is what separates an uneventful energisation from an incident report.

  4. 4

    Step 4: Power up the units and prove the supply, controls and communications

    Units are brought into service in a planned order rather than all at once. Each one is confirmed as fed from the circuit the schedule says feeds it - which is where mislabelled circuits are found, and they are found on most jobs - and confirmed to power up, self-test and report its own status cleanly. The control and monitoring systems are brought up and every control point and alarm point is checked against the unit it is supposed to represent, one at a time, which is tedious and always finds errors. Connectivity is proved from each installed unit rather than sampled, and the path off site to the operator's system is proved end to end. Cooling, lighting, cameras and access control are proved at the same time, because they are part of how the site will be run.

  5. 5

    Step 5: Prove charging with real vehicles

    Every unit is tested by actually charging a vehicle, on every bay, through every connector the unit is specified to provide. Simulators have their place in fault-finding, but a real vehicle is what finds the connector that does not latch, the cable that will not reach a port on the far side, the bay a car cannot get into cleanly and the unit that starts a session and drops it two minutes later. Sessions are run for long enough to see the unit settle rather than just to see it start. Energy delivered is checked against what the unit reports and against what the metering reports, because a discrepancy between those three numbers is a billing problem waiting to happen. Results are recorded per bay, per connector and per session.

  6. 6

    Step 6: Prove payment, tariff and the back office end to end

    Each unit is then proved as a point of sale. A real transaction is put through the payment terminal on every unit, using the payment routes the site is specified to accept, and the transaction is followed all the way through to the record that appears in the client's operator's system. The tariff is checked as applied rather than as configured. Refunds, failed authorisations and interrupted sessions are tested, because those are the situations that generate the complaints. Where the operator supports roaming or third-party access, at least one session is proved through that route as well. This step finds more genuine defects than the electrical testing does, and it is the one most often squeezed because it happens last and the site looks finished.

  7. 7

    Step 7: Prove load management, remote operation and fault reporting

    The site is then tested as a system rather than as a set of units. Where load management is part of the design, multiple units are charged simultaneously and the behaviour is checked against what the design said would happen - power shared as intended, the site never exceeding its connection capacity, and the units recovering sensibly when a vehicle leaves. Remote start, stop, reset and firmware update are exercised from the operator's system. A fault is deliberately created on a unit and followed through to the alert reaching whoever is meant to act on it, because on an unmanned site the value of detection lies entirely in somebody being told, and told accurately. Emergency isolation and shutdown arrangements are tested and recorded.

  8. 8

    Step 8: Soft-launch, close the snags and hand over to the operator

    Where the client allows it the site opens quietly before it opens properly, running with real customers for an agreed period so that the faults that only appear in real use - the reversing driver who cannot reach the cable, the session that fails on one particular vehicle, the screen unreadable in low sun - surface while the installation team is still there. Faults are logged, diagnosed and closed with evidence rather than assertion. In parallel the handover pack is completed: as-built drawings reflecting what is installed, verified settings, all test and commissioning records, the reconciled bay and unit schedule, connectivity and account ownership transferred properly, manuals, spares, warranty terms, maintenance obligations, the emergency isolation arrangements and the training the operator's and the site's staff need. Takeover is a formal event, and the quality of the documentation at this point decides how well the site runs for the next decade.

Plant & equipment

  • Calibrated insulation, continuity, earth and functional test equipment with current certificates
  • Test vehicles covering the connector types the site is specified to serve
  • Charging load simulators for repeat testing and fault diagnosis
  • Payment test cards and accounts covering every payment route the site accepts
  • Data loggers and power quality instrumentation for load management and metering verification
  • Thermal imaging cameras for inspection during and after energisation
  • Signal and network test equipment for proving connectivity from each installed unit
  • Permit, isolation, lock-off and demarcation equipment for the site safety rules

Quality control & testing

  • Every test carried out with calibrated instruments and recorded with traceable serial numbers
  • Every circuit confirmed as feeding the unit the schedule says it feeds, one by one and not by sample
  • Switching sequences written, checked and briefed before any energisation step
  • Every unit and every connector proved with a real charging session, recorded per bay
  • A real payment transaction proved on every unit and followed through to the back-office record
  • Energy delivered reconciled between the vehicle, the unit and the metering
  • Load management behaviour tested with multiple units in use and checked against the design intent
  • Complete handover pack issued and accepted before takeover, including records, credentials, spares and training

Safety watchpoints

  • The installation is live - all work under the site safety rules, with permits issued by an appointed authorised person
  • Switching at the connection point carried out under the distribution network operator's control
  • Arc flash risk during switching and testing, with protective equipment and exclusion set by the assessment
  • Clear physical and procedural separation between energised bays and any work still in progress
  • Public access to bays that look finished but are not yet in service, controlled by barriers and covers rather than by signage alone
  • Vehicle movements around test charging, with the connector, cable and driver all in the same small space
  • Emergency isolation arrangements in place, understood and rehearsed before the site opens to customers
  • Fatigue management during out-of-hours energisation and testing, when errors are most likely and least forgiving

Common defects to hunt

  • Units proved to charge but never proved to take a payment, so the site cannot open on the advertised date
  • Circuits found at commissioning to feed a different unit from the one the schedule shows
  • Connectivity that worked during the site survey but not from the installed unit position, leaving bays the operator cannot see
  • Tariff configured but never proved, so the first real customers are billed incorrectly
  • Energy reported by the unit not reconciling with the metering, producing billing disputes from day one
  • Load management untested with multiple vehicles, so the site trips or throttles unexpectedly on its first busy day
  • Fault alerts that reach the control system but never leave it, leaving an unmanned site nobody is watching
  • Handover pack incomplete or inconsistent, delaying takeover long after the units themselves work perfectly

How long does Commissioning & Energisation take?

Typical duration: Typically 1-3 weeks from energisation to takeover on a mid-sized scheme, though the network operator's energisation date, connectivity problems and back-office configuration drive the timescale far more than the testing itself..

Related processes

Previous in sequence

04 - Charger Installation

Handover complete - the journey ends here.