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Low Emission Bus Hub

The Low Emission Bus Hub contains key resources from LowCVP activities in the UK bus sector relating to funding and policy, supporting the Department of Transport and industry via our Bus Working Group to drive the shift to net-zero greenhouse gas emissions. 

The Low Emission Bus Hub includes information on:

  • UK funding streams and incentives for Low Emission Buses (LEB) and Ultra Low Emission Buses (ULEB).
  • Published LEB Certificates and ULEB Certificates used for claiming the BSOG LCEB incentive, detailing vehicle fuel consumption and emissions performance.
  • LowCVP's Low Emission Bus Guide that details everything you need to know about Low Emission Bus technologies and supporting infrastructure, including infromation on suppliers and UK case studies .
  • Presentations from LowCVP's Low Emission Bus and Zero Emission Bus regional workshops that detail experiences from UK operators and local authorities.
  • The Low Carbon Vehicle Operation certificates which highlight the benefits of using low carbon fuels and energy in combination – find out more
  • UK well-to-tank greenhouse gas conversion factors used for calculating the well-to-wheel impact of LEB and ULEB buses in the UK– find out more
  • Testing and accreditation procedures for the LEB and ULEB Accreditation Schemes – find out more
  • The “Areas of Operation” map detailing the key LEB and ULEB fleets are in the UK – find out more
LowCVP's LEB Scheme Guidance


Quick Links

Low Emission Bus Workshops 2018

LowCVP are hosting free regional Low Emisison Bus workshops for local authorities and bus and coach operators to disseminate the real world experience of low emission technologies and fuels. The most recent workshop was held in Birmingham Airport on the 11th December 2018.


Low Emission Bus Scheme

As part of the £500m budget available to OLEV, £30m has been set aside to support the purchase of low emission buses across the UK. The Low Emission Bus Scheme builds on the success of the Green Bus Fund and Low Carbon Emission Bus accreditation scheme before it, which were developed by the LowCVP and has seen the introduction over 2,000 low carbon emission buses into UK bus fleets.

The new Low Emission Bus Scheme has four primary objectives:

  1. Increase the uptake of low and ultra-low emission buses in local authority across England and Wales.
  2. Support the improvement in local air quality.
  3. Reduce the impact of road transport on climate change.
  4. Continue to support the UK manufacturing sector and attract investment to the UK.


LEB Certificates

A list of vehicles that have demonstrated through the LUB test cycle at least a 15% GHG WTW saving, compared with a diesel bus of the equivalent passenger capacity, is available to view [HERE].


Ultra Low Emission Bus Scheme

The Ultra-Low Emission Bus Scheme is the latest round of funding to support the purchase of Ultra Low Emission Buses and supportign infrastructure from the Office for Low Emission Vehicles (OLEV) and the Department for Transport (DfT). Deadline for applications to the scheme extended to the 16th July.

[ULEB Guidance]

Ultra Low Emission Bus Certificates

The LowCVP publish test certificates of accredited Ultra Low Emission Buses which are required for manufactueres to recieve grant funding under the Ultra Low Emission Bus Scheme.


Well-to-Tank Factors

A Well-to-Tank emissions factor, also known as upstream or indirect emissions, is an average of all the GHG emissions released into the atmosphere from the production, processing and delivery of a fuel or energy vector. These factors are used in calculating the greenhouse gas emission impact of Low and Ultra Low Emission Buses.


LEB Testing and Accreditation

The procedures for testing and accreditation of LEBs are based upon a type approval process. To determine whether a bus meets the minimum emission targets requires a whole vehicle emissions test, of both the potential Low Emission Bus and its diesel equivalent, to calculate and compare their relative WTW GHG emissions.

Further details can be found in the section on testing and accreditation procedures.


A low emission bus (LEB) is one that operates using efficient Scrolltechnology or alternative fuels rather than just a traditional diesel engine. They are defined by the UK Government as producing 15% less Well-to-Wheel (WTW) emissions compared with an equivalent Euro V standard diesel bus.

Low emission buses can help lower the running cost and environmental impact of your fleet. [Click for More]

Find out more about the various LEB technologies:

Documents & Resources

How these LowCVP resources can help you:

  • Shows the business, environmental and operational case for using low emission buses.
  • Gives bus operators the knowledge and resource required to assess which vehicles are right for them.
  • Provides case studies showing the cost savings achievable from the different types of low emission fuels and retrofit technologies.
  • Provides useful information on the low emission bus market, government policy, infrastructure and where you can obtain more detailed assistance for assessing your fleet.

The Low Emission Bus Guide

The Low Emission Bus Guide aims to provide bus operators and local authorities with an overview of the benefits of a range of low emission fuels and technologies that reduce both air pollution and greenhouse gas emissions. The guide outlines the emission performance, operational and financial factors, fleet operators should consider when procuring new buses or retrofitting exhaust aftertreatment technology to existing diesel buses. Real-world bus operator case studies are discussed in the guide to highlight and demonstrate the environmental and business cases for the range of different technologies and fuels.

LowCVP continues to raise awareness about the guide and disseminate hard copies at all bus working group related events. The guide is also available to download in .pdf format.

Click on the banner on the left to download a free copy.

Greener Journeys

LowCVP's LEB Publications

Greener Journeys had asked the LowCVP to undertake a project intended to evidence and promote the benefits of clean buses in the transport system. The overarching goal was to raise awareness about the central role low emission buses play in improving air quality and carbon management, particularly in cities, whilst bringing about a multitude of societal and economic benefits. The project was broken down into three phases which aim to build a coherent and wide reaching story of the green bus market.

LEB Certificates


A list of vehicles that have demonstrated through the LUB test cycle at least a 15% GHG WTW saving, compared with a diesel bus of the equivalent passenger capacity, is available to view.

Low Emission Bus Workshops 2018/19

The Low Emission Bus Workshop series is designed to inform bus operators and local authorities about the range of Low Emission Bus technologies and fuels currently available in the UK. The regional workshops will provide insight from local authorities and bus operators who have implemented low carbon and low emission bus technologies into their fleets over the last 5 years, highlighting key challenges and solutions alongside the environmental and financial benefits observed. The topics will cover technologies and fuels including: hybrids, battery electric, plug-in hybrids, biomethane, efficient diesels, biodiesel and SCR retrofit systems.

Following workshops in Bristol and Southampton. Suggestions welcome.

Previous Workshops:

Workshop ADL at Glasgow SEC



The latest news from the industry.

Related External Links

Low Emission Bus scheme guidance documents:


LCEB Map of UK

Areas of Operation

Click on the map to find out more about where certified Low Carbon Emission Buses are currently running in the UK with our interactive map.