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Clean Vehicle Retrofit Accreditation Scheme


The LowCVP are providing technical support on testing and market information to the Energy Saving Trust to assit the operation of the Clean Vehicle Retrofit Accreditation Scheme (CVRAS). 

For accredited models and test protocols, visit the Energy Saving Trust website.

The Clean Vehicle Retrofit Technology Guide

To support the Clean Vehicle Retrofit Accrediation Scheme, the LowCVP has created a guide that helps explain the how different retrofit technologies work with supporting case studies, how they are accredited and the UK policy framework that is driving the uptake of retorfit solutions to help reduce air pollutants from exisitng diesel vehicles.

Download the Clean Vehicle Retrofit Technology Guide

The Clean Vehicle Retrofit Accrediation Scheme (CVRAS)

Working closely with the DfT/DEFRA Joint Air Quality Unit (JAQU), the LowCVP and the Energy Saving Trust have jointly developed a technology verification scheme for clean air retrofit solutions for a wide range of vehicles that acheive Euro 6 / VI equivalent emissions.

Funding for this programme of work has been derived directly from JAQU. Initially targeting buses and coaches and quickly developing into trucks, taxis, and vans, the scheme will enable technology providers to verify and accredit the performance of their products for NOx reduction and entry into Clean Air Zones.

The retrofit accreditation process is technology neutral and designed to allow 'credible' emissions reduction technology companies apply for accreditation. Technologies already accredited include: SCR (Selective Catalytic Reduction) fitted to exhaust systems, convert to battery electric, repower and conversion to LPG and to repower with Euro VI engines . To acheive accrediation, technologies will need to provide roboust, independent relevant test data of the NOx reduction performance to Euro 6/VI equivalent levels.

Full details of accredited solutions and test protocols are available from the EST CVRAS website.


Technical standard documentation and test protocol definitions.

Delivery Timetable

February 2017 - present

Project Management

This project is managed by Andy Eastlake and Brian Robinson (LowCVP) and Colin Smith (EST).
With additional input from LowCVP's BWG (buses and coaches), CVWG (trucks, vans and other commercial vehicles) and PCWG (taxis).

Project Partners

Energy Saving Trust, JAQU, TfL


Related Resources

Further scheme documentation and information available via
Energy Saving Trust CVRAS website

Draft copies of the following documents are currently available for members only.

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