Net zero and the energy system transition
Decentralised System Resilience (Phase 2)
This project constitutes a research study investigating the opportunities for gas network infrastructure to provide resilience solutions.
Organisations are becoming more reliant on electricity just as the grid decentralises driving a growing need for stronger resilience against power outages. High profile outages such as those seen around Heathrow Airport and across Spain and Portugal in 2025 have brought the need for additional resilience solutions sharply into focus.
By engaging end users DNOs and other stakeholders this programme will quantify the UK’s resilience challenge build the evidence base and determine whether there are opportunities for gas to play an additional role in providing resilience.
BioFlex
This project constitutes a focused feasibility assessment of local biomethane market models with the objective of determining how decentralised commercial arrangements can enable increased participation from small-scale and community anaerobic digestion (AD) producers. The study will examine commercial structures regulatory considerations and stakeholder readiness associated with enabling localised trading of green gas through existing distribution networks. It will assess the interaction between market design connection approaches and consumer engagement to identify viable pathways for implementation and scale-up.
Accuracy of electronic volume conversion systems when metering blends of hydrogen and natural gas
This project focuses on ensuring accurate volume conversion within gas metering processes as hydrogen is blended into the natural gas network across Great Britain. Accurate measurement is essential for fair billing and maintaining customer trust during the energy transition. The project will study real world metering installations assess potential errors caused by hydrogen blending and develop practical mitigation strategies. Findings will inform updates to industry guidance (IGEM/GM/5) supporting regulatory compliance and operational integrity.
Futures Close Heat Programme (FC Heat)
To reach our national net zero targets by 2050 we need to decarbonise approximately 25 million homes in England. Domestic heating accounts for approximately 14% of the UKs entire emissions and significant investment is required to improve the energy efficiency of our housing stock. In addition there are major challenges associated with domestic decarbonisation:
- England has the most diverse housing stock in the UK. with 35% built before the end of WWII.
- Sixty-four percent are owner-occupied and these homeowners need to have a good cost effective and efficient experience of home and heating upgrade as we move towards zero carbon homes.
- Implementing heating upgrades to this ageing housing stock requires a ‘whole house’ approach therefore consideration must be given to the building fabric and heating system.
Retrofitting existing homes with electric heating systems or deployment of green hydrogen boilers offer potential solutions however the intricacies of deployment and installation are complex further research and development is required to learn more about installation performance of various heating options. Doing so will inform future domestic decarbonisation strategies.
Digestate Management
This project constitutes a UK-wide strategic assessment of digestate production arising from projected biomethane growth including quantification of volumes in 2030 2040 and 2050 and analysis of nutrient composition (nitrogen phosphorus and potassium). Sustainable land-spreading capacity will be evaluated under current regulatory constraints with regional nutrient imbalances mapped. Export potential and post-processing technologies will be assessed to determine infrastructure needs and optimal management pathways. Findings will inform how digestate management can best support sustainable biomethane growth.
Hydrogen Transition Pathways for Industrial Clusters
Hydrogen Transition Pathways for Industrial Clusters (HTPIC) is a six-month evidence led research and decision support project developed in response to the EIC’s call for innovation on the energy transition of industrial clusters. The project addresses the challenge of determining where how and under what conditions hydrogen should play a role in decarbonising industrial clusters and surrounding communities alongside credible alternative pathways.
Across the GB energy system existing hydrogen programmes and studies are typically undertaken on a cluster-by-cluster or project-specific basis using differing assumptions scenarios and decision criteria. This makes it difficult for networks and policymakers to compare options consistently understand system level trade-offs or prioritise investment in a transparent and auditable way. The absence of a common decision framework increases the risk of misaligned investment stranded assets and inconsistent outcomes across regions.
HTPIC aims to close this gap by providing NGN Future Energy Networks (FEN) and Xoserve with a structured repeatable decision framework that enables consistent evidence-based comparison of hydrogen pathways across industrial clusters. The project integrates technical economic social and deliverability considerations within a multi-criteria decision-making (MCDM) framework allowing complex evidence to be translated into clear and practical insights rather than standalone studies or narrative recommendations.
The project will be delivered in three stages:
- Stage 1 establishes a robust evidence baseline including a comprehensive literature and evidence review documented assumptions register and confirmation of scope and clusters.
- Stage 2 generates robust comparable evidence across clusters through four analytical workstreams covering hydrogen supply and demand gas coexistence and system configuration conversion practicality and costs and just-transition considerations while developing and calibrating the MCDM framework with stakeholders.
- Stage 3 applies the agreed framework to undertake structured optioneering and scenario analysis resulting in prioritised pathways cluster-specific conversion playbooks and decision-ready outputs.
Key outputs include:
- a literature and evidence review with a transparent assumption register;
- a defensible options-rationalisation matrix and MCDM framework;
- a comprehensive report addressing the four research questions set out in the EIC brief supported by an executive summary and cluster-specific annexes;
- cluster-level conversion playbooks translating analysis into practical location-specific insights;
- pathway roadmaps to 2050; and
- a final dissemination pack to support knowledge sharing across NGN FEN Xoserve and Ofgem audiences .
HTPIC will support improved strategic planning for hydrogen and alternative decarbonisation pathways reduce the risk of misaligned investment and stranded assets through structured prioritisation and strengthen alignment between industrial cluster ambitions and network development plans. By providing a transparent and consistent decision framework the project enables clearer sequencing of pathways more robust comparison of hydrogen and alternative options and improved confidence in future investment appraisal.
The project will also enhance understanding of affordability workforce implications and wider community impacts ensuring that pathway selection considers both technical feasibility and socio-economic factors. Through its systematic assessment of coexistence conversion practicality and deliverability HTPIC supports safer and more coordinated progression into downstream engineering and delivery programmes.
HTPIC will generate new system-level learning on hydrogen coexistence conversion practicality and community impacts presented through a structured scenario-based and weighted decision framework that enables transparent comparison across industrial clusters. This learning will strengthen evidence-based decision making across networks and provide a clearer foundation for future programme development regulatory engagement and investment planning.
Learning will be disseminated through the dissemination event final report executive summary and EIC knowledge-sharing channels supporting wider GB network benefit.
The project commences at TRL 2 where the structured assessment methodology and decision framework are defined conceptually. Over the course of delivery the framework will be applied across multiple industrial clusters tested against real-world scenarios and stakeholder calibration and analytically validated through structured optioneering.
By project close the solution will have progressed to TRL 3 with the methodology demonstrated and validated in a decision-support context delivering robust prioritisation and clearly articulated pathways.
The project does not include detailed engineering design trials or implementation. Early-stage engineering validation or delivery programmes across industrial clusters are already underway or in development through separate governance funding and procurement routes. HTPIC is designed to strengthen and rationalise those activities by providing a structured evidence base and decision framework to support confident downstream investment and engineering decisions.
Internal Stress Corrosion Cracking (ISCC) Pipeline Screening Tool
Being able to repurpose transmission assets for use with hydrogen and hydrogen blends can create a reliable and affordable option for decarbonising the UK and achieving Net Zero by 2050. A reliable and affordable energy system is needed to create “a fair affordable and inclusive transition to low carbon energy” (OFGEM) for all consumers (vulnerable or otherwise).
ISCC is potentially a major risk to the integrity of high-pressure pipelines repurposed for hydrogen blends. A means of assessing the risk is required as part of a pipeline integrity management system. This project aims to develop a clear risk assessment methodology which updates and enhances the methodology under NIA_NGGD0008. The methodology will then be deployed and tested across the Cadent LTS pipeline network with physical inspections being carried out on locations with high risk of ISCC.
Low Carbon Conversion of Non Domestic Properties Utilising Distributed Natural Gas
This project investigates the technical and economic feasibility of converting non-domestic buildings from natural gas to low carbon energy sources specifically hydrogen and electricity. It aims to address the significant evidence gap around the conversion of commercial and institutional buildings that are currently supplied by the GB gas distribution networks. The study will assess a wide range of building archetypes including care homes schools hospitality venues and light industrial sites using a combination of literature review site surveys detailed system designs and technoeconomic modelling. The outputs will inform future energy policy support infrastructure planning and help ensure safe and cost-effective deployment of low carbon technologies in non-domestic settings.
HyNTS Corrosion
The National Transmission System (NTS) pipelines employ a number of external corrosion barrier coatings primarily coal tar enamel and fusion bonded epoxy (FBE). Cathodic protection is deployed on the network to mitigate for coating failure. Additionally there are a range of pipeline steels that are used in both above ground buried pipework both stainless and carbon steels of various grades.
Following the previous NIA project: Research the Impact of Hydrogen on CP & Degradation of Coatings (NIA NGGT0191) the HSE have recommended follow-on testing to fully explore the impact of hydrogen permeation through steel pipelines on corrosion protection systems.
Additionally the impact of hydrogen on all credible pipeline corrosion mechanisms is to be considered to understand whether current assumptions with regards corrosion rates are valid for hydrogen pipelines.
Variable Blends Operational
National Gas Transmission are working to decarbonise the gas grid by transporting hydrogen rather than natural gas. Blending hydrogen with natural gas provides a stepping stone towards this goal fostering the hydrogen economy whilst also benefiting from up to 7% carbon savings from a respective 20% hydrogen blend.
The UK government supports blending up to 20% hydrogen by volume into the gas distribution networks and there are ongoing trials and assessments into proving the safety and technical feasibility of hydrogen blending across all networks and pressure tiers in the UK. It is anticipated that initially a low percentage hydrogen blend will be accepted onto the National Transmission System with this potentially increasing up to 20% hydrogen blends being accepted. This is largely due to few modifications being required to accommodate low hydrogen blend percentages on the NTS.
Additionally NTS level hydrogen blending is likely to develop in phases of hydrogen blend percentage entering the network due to the hydrogen supply in the UK developing gradually over time. 2% hydrogen on the NTS equates to approximately 5TWh of hydrogen production therefore increasing this percentage will require time.
Variability in the gas blends of the network is likely due to the production of hydrogen gradually increasing over time and injection of that hydrogen being geographically spread across the network. There is also potential that hydrogen supply can vary based on factors such as production methods direct demand off takers and availability. Therefore it is important to understand the implications of blended hydrogen and natural gas at variable levels between 0-5% hydrogen and 0-20% hydrogen blend.
Hydrogen blend variability encompasses a range of factors that need to be carefully managed to ensure a successful transition to a hydrogen-integrated energy system. Understanding the impact to stakeholders such as current customers and interconnecting countries will be crucial to successfully transitioning to a blended network and identifying ways to mitigate any risks and make sure National Gas are aligned to support our stakeholders needs where possible. There is also a need to evidence the impacts and any associated changes to risks from a whole system management perspective and to research the impact of blend variability on compressor train machinery assets.
Hydrogen AGI Pipework Integrity Monitoring Phase 2
This project proposes a structured approach to assess the integrity of AGI pipework for hydrogen service. It includes development of a screening tool based on representative AGI archetypes execution of ECAs to define flaw tolerances and inspection intervals and evaluation of NDT capabilities with respect to desired AGI performances. The project also reviews integrity management software to support increased digitalisation and monitors emerging technologies for hydrogen-related NDT developments.
Pipeline Installation Techniques for Net Zero
This RIIO-2 NIA project is a desktop research study designed to support the transition of the National Transmission System to hydrogen and carbon dioxide. It evaluates construction commissioning procurement and connection challenges and identifies scalable standardisable solutions to support future Net Zero pipeline delivery.
Net Zero Safety & Ignition Risk
National Gas Transmission (NGT) owns and operates the UK’s extensive National Transmission System (NTS) which spans over 7600 kilometres and plays a vital role in delivering energy security and supporting decarbonisation initiatives. NGT has made a commitment to develop plans to transition some of the NTS to blended hydrogen operation as part of the Government’s Net Zero targets. A programme called Project Union is being developed to spearhead the NTS conversion strategy as part of the decarbonisation effort. This will further aid the net-zero target by eliminating emissions generated from managing and operating the transmission system. The Gas Distribution Networks (GDNs) and NGT have been making strides in the last decade through research physical testing etc to qualify hydrogen as a fuel within the NTS.
Hydrogen is a promising alternative fuel due to its potential to significantly reduce greenhouse emissions; however its properties present unique safety challenges. It has a much lower ignition energy (0.016mJ) when compared to Natural Gas making it more susceptible to ignition from a variety of sources along with much more devastating effects if ignition occurs.
An area of consideration for safe hydrogen operation is the ignition risk of hydrogen. This risk will span daily operations maintenance tasks compression and transport etc. Ignition risk needs to be meticulously investigated to ensure National Gas are aware of all the possible ignition mechanisms sources likelihood safeguards and mitigations etc. to ensure safe utilisation of hydrogen on the network.
This work will provide a comprehensive understanding of hydrogen ignition risks on the network with safeguards and mitigations to bring the risk of ignition into the ‘Tolerable if ALARP’ or ‘Broadly Acceptable’ levels.
TD2 Hydrogen Update
External DNV - £247365
External IGEM - £10000
Internal - £64635
£322000
Net Zero Impact on Wider Network Contents
This project aims to explore the impact of hydrogen blends (in natural gas) 100% hydrogen and carbon dioxide on contaminants (arisings) likely to be found in gas transmission pipelines (e.g. Naturally Occurring Radioactive Materials (NORMs) dusts mill scale welding slag glycols water BTEX methanol heavy metals sulphur compounds pyrophorics as well as rotating machinery lube/seal oils and valve sealants etc).
The project will aim to understand the current composition and characteristics of any contaminants the impact of hydrogen and carbon dioxide on the behaviour/composition/presence of contaminants establish how long methane related contaminants will persist on the network (for repurposed pipelines) the potential for contaminants to cause pipeline gas to go ‘off-spec’ and the implications of contaminant interactions on National Transmission System (NTS) operation/integrity.
Equations of State for Net Zero Gases
In metering applications Equations of State (EoS) are mathematical models that are used to convert measured volumes to standard units. This enables transfer from volume to mass allowing customers to be billed and for the networked to be balanced in energy. Metering and network balancing cannot be performed in volume as it doesn’t account for relative varying gas component concentrations – and therefore CV.
The EoS currently used (AGA8) is acceptable for up to 5% hydrogen but after this point it’s uncertainty is unknown – meaning the network may be unable to maintain accurate billing or system balancing. This project will obtain experimental data for a range of net zero gases and compare the output of several EoS for accuracy against real measured NTS-representative conditions.
Clean Power Flexibility Investigation
Clean Power 2030 (CP2030) aims for a fully decarbonised electricity system using unabated gas only as backup. This introduces an important challenge: how can the gas transmission network remain viable and deliver flexibility during extreme demand events despite not being utilised most of the time? This project aims to understand how to sustain the gas network technically and economically in a low average high peak demand future focusing on the interaction between gas and electricity systems.
Hydrogen device trials
In order to support UK ambitions for hydrogen blending and the development of a hydrogen economy National Gas will need to install new gas chromatographs with the capability to measure hydrogen up to 20% in a natural gas blend. At present hydrogen is not measured anywhere on the National Transmission System (NTS) and therefore there are no proven in-use devices and limited experience within the company to allow effective decision making in deploying these assets in the move towards net zero.
In order to make informed decisions ahead of chromatograph fleet upgrade and to allow for a wide selection of reliable device choices when it comes to that upgrade National Gas require the testing of available devices to analyse their performance and thus suitability for NTS installation. This project will employ a trusted testing house to obtain (through loaning) blend-ready chromatographs from suppliers and then to rigorously examine the performance of those devices. These devices could be tested at the testing house’s site or at the instrument vendor’s site.
Integrity Management of Carbon Dioxide Pipelines
Existing defect methodologies are aligned with the management procedures and are adopted to inspect assess and repair the pipelines for defects and take suitable measures to reduce them. However the applicability of these techniques in the presence of gaseous phase Carbon Dioxide remains uncertain. The project will identify relevant defect types which may be encountered and considered hazardous in the presence of carbon dioxide study the impact of gaseous phase carbon dioxide and corrosion has on them assess whether the failure mechanism has changed after introducing carbon dioxide and recommend inspection assessment and repair approaches. Additionally the project will capture the extent of repairs across the NTS and assess the impact of implementation of the recommended gaseous phase carbon dioxide inspection assessment and mitigation technologies in terms of safety and useability.
Hydrogen Impact on NTS Welds
This project investigates how hydrogen affects the integrity of welded joints (seam welds and girth welds) in the UK National Transmission System (NTS) pipelines as part of plans to repurpose existing natural gas infrastructure for hydrogen transport.
Specifically Work Package 4 integrates results from metallurgical characterisation historical weld procedures and fracture toughness testing conducted in high-pressure hydrogen. The study examines pipeline steels of different grades and vintages (including X46 X52 X60 X65 and X80) focusing on weld metal and heat-affected zones (HAZ) which are known to be the most vulnerable regions.
The report combines:
- Detailed metallography and hardness mapping of real NTS welds
- Post-test fractographic analysis of specimens tested in hydrogen
- Interpretation of fracture toughness data
- An overall assessment of risks and uncertainties associated with hydrogen service
- Recommendations to support safe decision-making for hydrogen repurposing.