Electric vehicle supply equipment

Electric vehicle supply equipment (EVSE) measures active electrical energy supplied to or from an electric vehicle.

Businesses use EVSE to measure electricity and charge customers.

EVSE has other names, for example electrical vehicle charging stations (EVCS). We use the term EVSE in line with the international guide.

Trade measurement policy for EVSE

EVSE must correctly measure the amount of active electrical energy supplied to or from an electric vehicle. It must not misrepresent the calculated cost of the energy supplied.

There are no requirements for electric vehicle chargers that do not measure active electrical energy for tax or billing purposes.

All EVSE made on or after 1 April 2026 must comply with the general certificate of approval for electric vehicle supply equipment (NMI 14/4/0). This includes the maximum permissible errors (MPEs) for accuracy.

This policy is the result of extensive consultation with industry.

The requirements are below and depend on the age of the EVSE. We aim to transition to a full EVSE control framework within 10 years.

EVSE made before 1 April 2026

  • EVSE made before 1 April 2026 must comply with the specified MPEs.
  • The MPEs apply only to testing EVSE in a laboratory under specific conditions.
  • EVSE does not currently need to be tested or verified.
  • Class A MPEs would apply to EVSE with no marked accuracy class only if it were tested under the authority of a trade measurement inspector.
  • After 1 April 2036 (i.e. after the 10-year transition period), all EVSE made must comply with the EVSE control framework. We are developing this framework as part of the policy action plan.

EVSE made on or after 1 April 2026

  • EVSE made on or after 1 April 2026 must comply with the MPEs.
  • EVSE must be marked in accordance with the general certificate of approval.
  • EVSE must be appropriately sealed to prevent unauthorised changes.
  • The MPEs apply only to testing in a laboratory under specific reference conditions.
  • We will consider field testing and in-service MPEs after the International Organization of Legal Metrology (OIML) publishes the OIML Recommendation and we consult with stakeholders about it.
  • There is no requirement for EVSE testing or verification until we develop a framework. We will implement the framework over an appropriate timeframe.
  • After 1 April 2036 (i.e. after the 10-year transition period), all EVSE must comply with the relevant requirements. See the policy action plan for more information.

Policy action plan for an EVSE control framework

This action plan describes how we will develop and put in place the EVSE control framework.

The framework will consider:

  • adopting the published OIML Recommendation
  • pattern approval requirements (based on the OIML Recommendation)
  • verification test procedures (based on the OIML Recommendation)
  • a licensing framework for servicing license holders and verifiers.

EVSE will be pattern approved if it either:

10-year transition to a full EVSE control framework

There are 2 key dates in the transition to the EVSE control framework: 1 April 2026 and 1 April 2036. This gives a 10-year transition period for EVSE.

EVSE made before 1 April 2026 do not need to be pattern approved or verified.

EVSE made on or after 1 April 2026 must be pattern approved, but do not need to be verified until a we have developed a verification framework.

Until 1 April 2036, in the absence of any requirement for pattern approval and verification, we will take compliance and enforcement action only in cases where measurement is inaccurate or misrepresented.

After 1 April 2036, we expect to have a full EVSE control framework in place.

Policy development and consultation milestones

  • Ongoing consultation

    We will continue to consult publicly on: 

    • the general certificate of approval and MPEs, to consider stakeholder concerns about EVSE already installed and in use for trade
    • a control framework, including verification and licensing
    • timeframes for implementation.
  • Developing the OIML Recommendation for EVSE

    The OIML Technical Committee met in March 2025 to develop the OIML Recommendation for EVSE. They will consider:

    • field verification and MPEs
    • the extent of testing needed for an EVSE using an approved electricity meter.


    OIML expects to release a first draft of the Recommendation later in 2025. We will consult on this draft. This will allow stakeholders to give input on the draft OIML Recommendation. We will consider this feedback in our submission to the committee as part of the review.

  • Publishing the general certificate of approval

    We published the general certificate of approval in August 2024. Stakeholders have since raised concerns that the MPEs are not appropriate for existing EVSE. They were also concerned that requirements would apply retrospectively to EVSE already installed and in use for trade.

  • Consultation on draft general certificate of approval for EVSE and MPEs

    In 2024, we consulted on the draft general certificate of approval for EVSE and MPEs. The certificate specifies MPEs are in line with OIML G 22:2022 Electric vehicle supply equipment PDF 863 KB (OIML G 22). Read the general certificate of approval consultation and outcomes paper.

  • Consultation on trade measurement policy options

    We consulted on trade measurement policy options for electric vehicle charging stations between 2021 and 2022. Read the policy options consultation and outcomes paper. Decisions from this consultation included that EVSE are not electricity meters. We will develop EVSE requirements based on OIML G 22.

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