Heavy Goods Vehicles (HGVs) and buses produce 30% of our road transport emissions but only account for 4% of vehicles on our roads. If we convert these vehicles to run on Compressed Natural Gas (CNG), we can provide immediate emissions reductions and air quality improvements compared to diesel. It also provides a pathway for renewable gas in transport (Bio-CNG) as renewable gas is injected into the network.

The challenge

The transport sector is a large energy consumer and is the source of 20% of Ireland’s emissions or almost 11.9Mt CO₂. Using the gas network, a reduction of at least 2.8Mt CO₂/annum can be achieved by 2050.

A pathway to decarbonise transport by 2050

  • 20%

    Transport accounts for 20% of Ireland's total emissions. Equal to 11.9Mt CO₂

  • 4%

    Of vehicles (HGVs and buses) produce 30% of road transport emissions

  • 2030 target

    24% HGVs & 13% buses converted to Compressed Natural Gas (CNG) or Bio-CNG

Replacing diesel with CNG

Replacing diesel with CNG reduces harmful emissions and improves air quality and health. Additionally, CNG is an attractive solution for fleet owners, offering cheaper running costs.

  • Did you know?

    30% of our transport emissions are caused by 4% of vehicles.

    1 — 2

  • Did you know?

    Compressed Natural Gas (CNG) is a proven technology with over 26 million CNG vehicles in use worldwide.

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Why Compressed Natural Gas (CNG)?

Why CNG provides a smart solution to decarbonising transport.


CNG provides an immediate lower carbon solution for HGVs which will also improve air quality and health.


CNG can generate savings of up to 35% for fleet owners compared to diesel. 


CNG is a proven technology with over 26 million CNG vehicles in use worldwide.


CNG will provide a pathway for the use of Bio-CNG which is compressed renewable gas.

@GasNetIrl aims to enable the fuelling of 24% of HGVs and 13% of buses from CNG or Bio-CNG by 2030. #Vision2050 #renewableenergy #CleanerEnergyFuture

Our vision to decarbonise transport

Support fleet owners

Support fleet owners who are interested in the dual benefits of reducing emissions while making cost savings. CNG can generate savings of up to 35% for fleet owners compared to diesel. CNG HGVs and buses offer comparable re-fuelling times to diesel. The payback period for HGV trucks can be approximately 2-2.5 years, an attractive proposition for fleet owners.

Develop supporting infrastructure

Develop a 170 station CNG fuelling network on major routes and near urban centres. 40 of these are planned to be on public access forecourts, on major routes, and/or close to urban centres. Also help to develop 14 high capacity fast fill CNG stations.

Offer consumers confidence

Consumers need a guarantee that the gas they are buying is renewable and can be counted against their emission reduction targets. This will be done through a Green Gas Certification scheme.

Future technologies

The application of hydrogen in the transport sector is being explored and trialled in the US, Japan, Europe and other global locations. CNG and Bio-CNG provide a pathway for hydrogen powered HGVs and buses in the future.

What we are doing

Building partnerships

To make our vision of a 170 station CNG refuelling network possible we are building partnerships with forecourt operators and haulage companies. The first public access station is in operation at Dublin Port, with the capacity to refuel up to 70 HGVs per day.

CNG Vehicle Fund

In 2017 we launched a CNG Vehicle Fund, making up to €20,000 available to businesses towards the purchase of a new natural gas vehicle.

What needs to happen

Policy and supports will be needed to help transition HGVs and buses from diesel to CNG/Bio CNG.


We recommend that the both the Accelerated Capital Allowance scheme for gas vehicles and refuelling equipment (due to expire in December 2021) and the existing excise duty treatment (due to expire December 2024) are maintained until the HGV population is 30% gas powered (circa 5,000 trucks).


The following supports will stimulate the CNG/Bio-CNG market for HGVs and buses:
  • Transition the public transport fleet to CNG/Bio-CNG from diesel
  • Provide planning support for CNG re-fuelling stations
  • Eliminate toll charges for gas powered HGVs and buses
  • Introduce a grant scheme or tax relief for vehicle purchase to accelerate uptake and support early adopters

Green Gas Certification (GGC)

Gas Networks Ireland is developing a GGC scheme for Ireland in partnership with other Irish and European agencies.  Verifying renewable gas origin is important to provide consumers with confidence that the gas is renewable. When implemented it will support the growth of a renewable gas market in Ireland.

Read the full Vision 2050 report

Ireland's gas network has the potential to make a significant contribution to reducing Ireland's emissions. Read our vision for a net zero carbon gas network.

Download the Vision 2050 report now