Biochar is a circular and ecological solution to manage waste that is not recyclable. It is a charcoal-like substance, produced by heating organic biomass from biodegradable municipal, agriculture and forestry waste in the absence of oxygen (pyrolysis) to make it carbon-rich and chemically-stable offering enormous potential to combat climate change. Many forms of biochar use and application are emerging including its use as a building material. The use of biochar as low as 1% replacement of the fine aggregate in cementitious composites has been found to improve the compressive strength by approximately 10%. As well as having excellent insulating properties, improving air quality, being able to soak up moisture and protect from radiation, biochar also allows buildings to be turned into carbon sinks. The project vision is to provide a decision support framework to enhance the use of biochar within the UK building industry to make a significant contribution to fight climate change. The aim is to increase the level of awareness of biochar and its commercial, healthy revenue generation potential, carbon credits and environmental benefits for the building industry. We will carry out detailed analysis of the inclusion of different types of biochar in varying quantities in cementitious composites such as concrete, bricks, plaster, and grout. The physical, mechanical, and chemical properties of these composites such as concrete will be studied to understand their performance, overall durability and thermal conductivity for applications within buildings. In parallel to this these biochar composites would also run through building modelling to investigate contribution to energy savings and enhanced thermal efficiency in buildings. We will compare carbon savings with standard building construction for chosen building archetypes. The savings achieved will help us to assess the value of biochar in construction. Our interdisciplinary approach includes the participation and collaboration of stakeholders to generate qualitative and quantitative indicators to express, holistically, the value of biochar in modern low-carbon construction. Through an integrative stakeholder approach, this project aims to explore (a) the awareness of the commercial and revenue generation potential of biochar (b) its potential to realise carbon credits and environmental benefits for the built environment as well as (c) subjective perceptions of the overall value attached to biochar and the interest and motivation to increase its usage within the built environment sector. To share the outcomes of our research and to identify next steps for promoting the use of biochar in the UK we will use qualitative approaches to carefully design a series of events and workshops. True innovation in the built environment is highly dependent on national policy, building standards, urban regulations, construction codes, market conditions and financial mechanisms which facilitate or obstruct the emergence of innovative solutions. We will be therefore speaking to multi-stakeholders including policy makers, energy ministers, the Department for Energy Security and Net Zero and to understand the effectiveness, readiness, cost, social acceptability and limitations of biochar as the building material. We will illicit concerns, attitudes, challenges and opportunities for the biochar application within buildings and identify ways of how best to adapt legal regulations regarding production and usage of biochar and associated carbon credits. The final outcome being a decision support framework for practitioners in adopting biochar as a sustainable construction material with indicators proposed would be transferrable to other new (or less used) materials.

This project evaluates the potential of Seasonal Thermal Energy Storage (STES) systems to facilitate the decarbonisation of heating and cooling while at the same time providing flexibility services for the future net-zero energy system. The Committee on Climate Change's recent report highlighted that a complete decarbonisation of the building, industry and electricity sectors is required to reach net-zero. Current estimates are that 44% of the total energy demand in the UK is due to heat demand which has large seasonal variations (about 6 times higher in winter compared to summer) and high morning peak ramp-up rates (increase in heat demand is 10 times faster than the increase in electricity demand). Currently, around 80% of the heat is supplied through the natural gas grid which provides the flexibility and capacity to handle the large and fast variations but causes large greenhouse gas emissions. While cooling demand is currently very small in the UK, it is expected to increase significantly: National Grid estimates an increase of up to 100% of summer peak electricity demand due to air conditioning by 2050. In countries such as Denmark, district energy systems with Seasonal Thermal Energy Storage (STES) are already proving to be affordable and more sustainable alternatives to fossil fuel-based heating that are able to handle the high ramp-up rates and seasonal variations. However, the existing systems are usually designed and operated independently from the wider energy system (electricity, cooling, industry and transport sectors), while it has been shown that the best solution (in terms of emissions reduction and cost) can only be found if all energy sectors are combined and coordinated. In particular, large STES systems which are around 100 times cheaper per installed kWh compared to both electricity and small scale domestic thermal storage, can unlock synergies between heating and cooling demand on one side, and industrial, geothermal and waste heat, and variable renewable electricity generation on the other side. However, the existing systems cannot be directly translated to the UK due to different subsurface characteristics and different wider energy system contexts. In addition, the multi-sector integration is still an open challenge due to the complex and nonlinear interactions between the different sectors. This project will develop a holistic and integrated design of district energy systems with STES by considering the interplay and coordination between energy supply and demand, seasonal thermal storage characteristics, and regulation and market frameworks. The results and models from the individual areas will be combined in a whole system model for the design and operation of smart district energy systems with STES. The whole system model will be used to develop representative case studies and guidelines for urban, suburban and campus thermal energy systems based around the smart integration of STES systems. The results will enable the development and deployment of low carbon heating and cooling systems that provide affordable, flexible and reliable thermal energy for the customers while also improving the utilisation of the grid infrastructure and the integration of renewable generation assets and other heat sources.

Biomass is plant or woody material that during its growth has absorbed CO2 from the atmosphere through photosynthesis . When the biomass is used to produce bioenergy it re-releases to atmosphere the same amount of CO2 as was sequestered during growth. Therefore, as long as biomass growth is close in time period to release there is no net addition to the long term atmospheric CO2 concentration. However, some aspects of processing and using the biomass may generate additional greenhouse gas emissions that need to be accounted for and, given that the UK is trying to decrease all carbon emissions it is important that we make efficient use of our biomass resource by maximizing the production and use of truly sustainable resource and developing efficient pre-treatment and conversion technologies. It is also important that we make the best use of the sustainable biomass resource and fully understand the wider impact and costs of implementation. This project brings together leading UK bioenergy research groups to develop sustainable bioenergy systems that support the UK's transition to an affordable, resilient, low-carbon energy future. We will synthesize previous work on land and feedstock availability to assess the realistic potential resource for UK bioenergy and examine new crops that could support UK farming by delivering ecosystem benefits as well as biomass resource. We will test the performance of different feedstocks in high efficiency conversion options and develop new techniques which will improve resource efficiency in bioenergy systems, especially at small scale. We will evaluate the impact of using biomass for heat, electricity, transport fuels or chemicals to provide independent, authoritative information to guide decision making by industrialists and policy makers. We will assess the potential for bioenergy to contribute a proportion of the UK's future sustainable energy mix, taking into account the environmental, economic and social impacts of the processes. We will work with industrialists and policy makers to ensure that our work is relevant to their needs and reflects achievable implementation standards. We will share our findings in our research work widely with the industry and policy communities and make it accessible to societal stakeholders on our website, via special publications, in the conventional and on social media and with tailored events for public engagement.

Hydrogen and alternative liquid fuels (HALF) have an essential role in the net-zero transition by providing connectivity and flexibility across the energy system. Despite advancements in the field of hydrogen research both in the physical sciences and engineering, significant barriers remain to the scalable adoption of hydrogen and alternative liquid fuel technologies, and energy services, into the UK's local and national whole system infrastructure. These are technical barriers, organisational barriers, regulatory and societal barriers, and financial barriers. There are, therefore, significant gaps between current levels of hydrogen production, transportation, storage, conversion, and usage, and the estimated requirement for achieving net-zero by 2050. To address this, our proposed research programme has four interlinked work packages. WP1 will develop forward-thinking HALF technology roadmaps. We will assess supply chain availability and security. Selected representative HALF use cases will be used to identify and quantify any opportunities, risks and dependencies within a whole systems analysis. We will also develop an overarching roadmap for HALF system integration in order to inform technology advancement, industry and business development, as well as policy making and social interventions. WP2 will improve HALF characterisation and explore urgent new perspectives on the energy transition, including those related to ensuring resilience and security while also achieving net-zero. We will contrast the energy transition delivered by real incentives/behaviour versus those projected by widely-used optimisation models. The WP provides the whole systems modelling engine of the HI-ACT Hub, with a diverse array of state-of-the-art tools to explore HALF integration. WP 3 will explore the vital coupling of data and information relating to whole system planning and operational decision support, through the creation of a cyber physical architecture (CPA). This will generate new learning on current and future opportunities and risks, from a data and information perspective, which will lead to a whole system ontology for accelerated integration of hydrogen technologies. WP 4 considers options for a future energy system with HALF from a number of perspectives. The first is to consider expert views on HALF energy futures, and the public perceptions of those views. The second perspective considers place-based options for social benefit in HALF energy futures. The third perspective is to consider regulatory and policy options which would better enable HALF futures. Embedded across the research programme is the intent to create robust tools which are investment-oriented in their analysis. A Whole Systems and Energy Systems Integration approach is needed here, in order to better understand the interconnected and interdependent nature of complex energy systems from a technical, social, environmental and economic perspective. The Hub is led by Prof Sara Walker, Director of the EPSRC National Centre for Energy Systems Integration, supported by a team of 16 academics at a range of career stages. The team have extensive experience of large energy research projects and strong networks of stakeholders across England, Wales, Scotland and Northern Ireland. They bring to the Hub major hydrogen demonstrators through support from partners involved in InTEGReL in Gateshead, ReFLEX in Orkney, and FLEXIS Demonstration in South Wales for example. We shall engage to create a vibrant, diverse, and open community that has a deeper understanding of whole systems approaches and the role of hydrogen and alternative liquid fuels within that. We shall do so in a way which embeds Equality, Diversity and Inclusion in the approach. We shall do so in a way which is a hybrid of virtual and in-person field work consultation and develop appropriate digital tools for engagement.

Hydrogen and alternative liquid fuels (HALF) have an essential role in the net-zero transition by providing connectivity and flexibility across the energy system. Despite advancements in the field of hydrogen research both in the physical sciences and engineering, significant barriers remain to the scalable adoption of hydrogen and alternative liquid fuel technologies, and energy services, into the UK's local and national whole system infrastructure. These are technical barriers, organisational barriers, regulatory and societal barriers, and financial barriers. There are, therefore, significant gaps between current levels of hydrogen production, transportation, storage, conversion, and usage, and the estimated requirement for achieving net-zero by 2050. To address this, our proposed research programme has four interlinked work packages. WP1 will develop forward-thinking HALF technology roadmaps. We will assess supply chain availability and security. Selected representative HALF use cases will be used to identify and quantify any opportunities, risks and dependencies within a whole systems analysis. We will also develop an overarching roadmap for HALF system integration in order to inform technology advancement, industry and business development, as well as policy making and social interventions. WP2 will improve HALF characterisation and explore urgent new perspectives on the energy transition, including those related to ensuring resilience and security while also achieving net-zero. We will contrast the energy transition delivered by real incentives/behaviour versus those projected by widely-used optimisation models. The WP provides the whole systems modelling engine of the HI-ACT Hub, with a diverse array of state-of-the-art tools to explore HALF integration. WP 3 will explore the vital coupling of data and information relating to whole system planning and operational decision support, through the creation of a cyber physical architecture (CPA). This will generate new learning on current and future opportunities and risks, from a data and information perspective, which will lead to a whole system ontology for accelerated integration of hydrogen technologies. WP 4 considers options for a future energy system with HALF from a number of perspectives. The first is to consider expert views on HALF energy futures, and the public perceptions of those views. The second perspective considers place-based options for social benefit in HALF energy futures. The third perspective is to consider regulatory and policy options which would better enable HALF futures. Embedded across the research programme is the intent to create robust tools which are investment-oriented in their analysis. A Whole Systems and Energy Systems Integration approach is needed here, in order to better understand the interconnected and interdependent nature of complex energy systems from a technical, social, environmental and economic perspective. The Hub is led by Prof Sara Walker, Director of the EPSRC National Centre for Energy Systems Integration, supported by a team of 16 academics at a range of career stages. The team have extensive experience of large energy research projects and strong networks of stakeholders across England, Wales, Scotland and Northern Ireland. They bring to the Hub major hydrogen demonstrators through support from partners involved in InTEGReL in Gateshead, ReFLEX in Orkney, and FLEXIS Demonstration in South Wales for example. We shall engage to create a vibrant, diverse, and open community that has a deeper understanding of whole systems approaches and the role of hydrogen and alternative liquid fuels within that. We shall do so in a way which embeds Equality, Diversity and Inclusion in the approach. We shall do so in a way which is a hybrid of virtual and in-person field work consultation and develop appropriate digital tools for engagement.