Energy use and related emissions of the UK residential sector: quantitative modelling and policy implications

Reducing energy demand and carbon emissions from the UK housing stock through efficiency improvements is the focus of policy interest. The 2008 UK Climate Change Act set legally binding targets of an 80% reduction in greenhouse gas emissions against a 1990 baseline. The majority of emissions in the residential sector are carbon dioxide emissions arising from energy used for heating homes and water, cooking, lighting and electrical appliances. The sector s contribution to total UK emissions is significant and therefore reducing energy use in homes is an important factor if the UK is to meet its targets. In this research an initial survey of studies of the residential sector has been conducted to review factors considered to influence energy use and related emissions in UK housing. Further review identified energy and climate change policy instruments and structural change in the energy supply sector between 1970 and the present. A subsequent time-line of policy and events describes the changing, historical policy landscape related to energy efficiency improvements in the sector. As a result of these reviews, a need to better understand how householders have responded to technical energy efficiency improvements in housing, and the influence of social and economic factors, was identified as a research gap. In order to model householders historical behaviour Data Envelopment Analysis (DEA) was identified as an innovative approach for this field of research as a potential means to measure sector efficiency in a new way. The analysis has two stages. In the first, DEA is used to measure the relative efficiency with which the UK housing sector has managed its energy use and related emissions to deliver energy services such as space heating and lighting to householders. In the second stage, multiple regressions are used to examine whether the variability over time in the efficiency measure can be explained by policy interventions, energy market developments, and economic and social factors. DEA is a method for modelling the relative performance efficiency with which an observed sample converts measurable inputs to quantitative outputs. In this research, samples consist of annual observations of the UK housing stock, using data largely taken from DECC s UK housing energy fact file. An efficiency frontier of performance enveloping the observed sample points as closely as possible is constructed through DEA mathematical programming. The core of the analysis lies in identifying relevant quantitative input and output measures from available data. A range of measures of comfort and energy service levels to represent energy service outputs, and household energy and emissions data to represent inputs are examined in the analysis. The result is a timeline of efficiency performance that can be related to socio-economic change and the history of policy interventions. The analysis shows that the efficiency of the UK housing stock to manage its energy use and related emissions has not followed the steady upward trend that might have been expected from technical innovation. There is evidence of rebound effects over time, with householders behaviour in response to technical efficiency improvements acting to raise comfort levels rather than lower energy usage. Nevertheless, statistically significant roles can be identified for factors such as income, price and tenure which have implications for policy design and control and lead to a number of policy recommendations

Bristol urban integrated diagnostics project. Challenge theme report: Carbon neutral city

This report presents the key findings of the Carbon Neutral City theme of the Bristol Urban Integrated Diagnostics (Urban ID) pilot project, one of its four themes and five case studies. Urban ID was one of a small number of projects funded by the seven UK Research Councils and Innovate UK’s Urban Living Consortium to explore sustainability in city contexts. Urban ID brought together researchers from the two universities in Bristol, representatives of Bristol City Council, South Gloucestershire Council, the Bristol Green Capital Partnership, Bristol Health Partners, community groups and companies to explore and co-create means of diagnosing urban sustainability problems and potential solutions.The carbon neutral city theme explored four key questions:•What does ‘carbon neutrality’ means for the Bristol Urban Area (and what is the Bristol Urban Area) and over what timescale should such a vision be achieved?•What are the barriers to decarbonisation across the three scopes of carbon emissions (energy use; energy supply; consumption of goods and services)?•Can Urban ID co-design top-level aims and aspirations for the Bristol Urban Area in relation to carbon neutrality up to 2050?•Can carbon neutrality for the Bristol Urban Area include ‘all embodied carbon’ as well as emissions from energy use and supply?The project team concluded that in order to develop a pathway to carbon neutrality for the Bristol urban area there are several key questions to be addressed:1) What is the carbon budget for the urban area associated with energy production and use in the city region across different sectors – energy supply, domestic, transport, industrial and commercial?2) What are the current emissions from scopes 1, 2 and 3 (energy use; energy supply; and consumption of goods and services)?3) What are the ‘business as usual’ projections for emissions to 2030 and 2050 and how do these differ from a carbon neutral pathway?4) What mitigation actions are needed in different sectors to ‘zero’ the per-capita emissions value and how can carbon budgets assist with this?5) What is the embedded carbon in goods and services consumed and items purchased in the urban area and is this included in the carbon neutral definition? 6) What level of carbon sequestration is it appropriate to consider to offset any remaining emissions after mitigation actions across sectors?7) What are the geographical and economic boundaries of the Bristol Urban Area in relation to the carbon neutrality definition?8) What is the baseline year and what is the end point/target year for the Bristol Urban Area?The project reveals significant challenges in attempts to design and implement a pathway to a carbon neutral city, but also offers a range of insights and suggestions as to how the above questions might be addressed

Heating controls: International evidence base and policy experiences

This report presents a synthesis in the form of narrative summaries of the international evidence base and policy experiences on heating controls in the domestic sector. The research builds on the former Department of Energy and Climate Change (DECC) commissioned (systematic) scoping review of the UK evidence on heating controls published in 2016 (Lomas et al., 2016), and the Rapid Evidence Assessment of smarter heating controls published in 2014 (Munton et al., 2014). The report consists of two parts. Part 1 involves a (systematic) scoping review of the international evidence base on the energy savings, cost-effectiveness and usability of heating controls in the domestic sector. Part 2 contains the findings from an analysis of the policy experiences of other countries

Facilitating stakeholder dialogues on a carbon neutral city: We need to talk about carbon (and air quality)

© 2018 WIT Press. The issues surrounding successful public engagement with climate change mitigation policy and decision-making have been extensively researched and identified as barriers to long-term civic and civil engagement. The challenge of transforming our urban spaces to mitigate and adapt to climate change was a key theme of the Bristol Urban ID project, which explored the “business as usual” approaches in policy, practice and engagement that limit truly transformational actions. As part of the project, a Carbon Neutral Bristol 2050 roundtable was held with civic leaders and stakeholders. Discussions focussed on defining carbon neutrality targets, “scopes” and boundaries for Bristol, exploring the opportunity for Bristol to be a carbon neutral city leader, how to build political, business and citizen space for engagement with carbon neutrality, and the role of Bristol Green Capital Partnership (BGCP), a cross-sector network of over 800 organisation working for a sustainable city, as an enabler and facilitator of change. The findings demonstrate a need for organisations working on interconnected environmental, social and wellbeing, and economic issues in cities, such as carbon neutrality and air pollution, to communicate and collaborate. Partnership working is essential to improving city-wide engagement in carbon and air quality management decision making, and to developing integrated city sustainability management strategies that recognise co-benefits and trade-offs. A set of guidelines highlight the need to create political space for people and organisations to talk about carbon and air pollution to develop city plans

Making energy behaviour research relevant to policy: A tale of two studies

Within a context of shrinking government resources and greater pressure on academics and other researchers to generate ‘impact’ from (publically funded) research there is a greater need than ever to ensure that published research is readily usable by and relevant to policy end-users. Through examining and comparing two energy related evidence reviews commissioned by the UK government, this paper presents a set of recommendations for those researchers who seek to make their publications (in both the white and grey literature) more accessible, usable and relevant to those working in policy and practice domains

Designing healthier neighbourhoods: A systematic review of the impact of the neighbourhood design on health and wellbeing

Several studies have investigated the impact of neighbourhood design on health and wellbeing, yet there are limited reviews investigating the quality of the evidence and the most effective interventions at a population level. This systematic review aims to clarify the impact of the neighbourhood design on health and wellbeing and evaluate the quality of the evidence underpinning such associations. Eight electronic databases were searched for studies conducted between 2000 and 2016. Additional searches were conducted on Google to identify potentially eligible grey literature. A total of 7694 studies were returned from the literature search, and a final selection of 39 studies were deemed eligible for inclusion. Quality appraisal was conducted using the Quality Assessment Tool for Quantitative Studies. Findings from the studies showed important associations between neighbourhood design principles such as walkability, access to green space and amenities on health and wellbeing. Findings from this review also highlight areas with inconsistent findings and gaps in the evidence for future research

Healthy buildings for a healthy city: Is the public health evidence base informing current building policies?

Research has demonstrated that housing quality is a key urban intervention in reducing health risks and improving climate resilience, addressing a key ambition of the United Nations Sustainable Development Goals. Yet housing quality remains a problem even in high income countries such as England. In particular, hazards such as excess cold, excess heat and lack of ventilation leading to damp and mould have been identified as a major issue in homes. Research shows that these hazards can lead to a range of health conditions, such as respiratory and cardiovascular disease, infections and mental health problems. This article explores the use of public health research and evidence in policy to regulate new buildings in England to deliver improved public health, climate resilience and a reduced carbon footprint, in particular exploring the policy drivers and awareness of the public health evidence. Findings show that public health evidence is hardly referenced in policy and that the focus on other evidence bases such as on climate mitigation in building regulations results in both positive and negative impacts on health. This reflects a lack of a systems approach around urban interventions leading to weaknesses in standards regulating the private development sector. In conclusion, this paper recommends: 1. the consideration of health impact in future building regulations; 2. the integration and coordination of key policies covering various scales and phases of the development processes and 3. the better education of residents to understand advances in new energy performance technologies

Do domestic heating controls save energy? A review of the evidence

© 2018 The Authors Claims about the benefits of heating controls are often biased, unsubstantiated, misleading, or incorrect. This paper presents a systematic and critical international review of the evidence for the energy saving, cost effectiveness and usability of heating controls. The focus is domestic, low-pressure hot water heating systems in temperate climates. Eleven different types of standard, advanced and smart controls are assessed plus five components and features that add smart functionality. The review retrieved over 2400 documents from on-line databases and other sources. Screening criteria and quality assurance scoring identified just 67 items, mainly from the UK and USA, which appeared to contain relevant evidence. This evidence was derived from computer modelling, field trials and full-scale experiments, and for usability, from expert evaluations and controlled assessments. The evidence was synthesised and its quality classified as very low, low, moderate or high using the GRADE system which is more commonly applied in evidence-based medicine. The energy savings of most heating controls depends strongly on whether the heating system is operated with a continuous or periodic heating pattern, as well as on the energy efficiency of the dwelling and the severity of the climate. For most control types, the quality of the evidence for energy savings was low, very low or non-existent. However, there was moderate quality evidence that, when appropriately commissioned, zonal controllers, which heat individual spaces to different temperatures at different times, could save energy compared to whole-house controllers, and that low-cost systems of this type could be cost-effective. There was moderate quality evidence that smart thermostats do not save energy compared to standard thermostats and programmers and may, in fact, increase energy demand. The usability studies focussed on general heating controls and programmable thermostats and provided high quality evidence that heating controls are difficult to use, especially by older people. However, no studies were uncovered that quantified the consequent energy penalty. There was no high quality evidence about the impact on energy demand of any of the heating controls studied, mainly because there have been no well-founded, large-scale, multi-disciplinary, multi-year field trials

“Unfortunately, I use my car”: Commuter transport choices in Bristol, UK

© 2018 WIT Press. The leading source of nitrogen dioxide (NO2) concentrations in Bristol, United Kingdom is road transport, and Bristol exceeds the annual mean national air quality objective of 40 µg/m3 for NO2 in many locations around the city. Understanding the reasons for residents' modal choice is an important element in managing air quality in the city. The ClairCity Project approach provides insight into how to reduce overall transport demand and identify incentives that will be effective in creating modal switch away from higher polluting private motorised vehicles. From the ClairCity Project survey subset of commuters (n=442), 45% of respondents used cars or vans at least occasionally for their journey to work, with 28% of the total number of commuters relying exclusively on private motorised transport. The majority of these car users (65.6%) said they would prefer not to travel by car to work in the future. Their responses showed a mix of negative perceptions of public transport, geography and health as key motivations. Family responsibilities, lack of safe cycling and walking spaces, poor health and disability, distance, requirements to transport goods as well as themselves and the need for flexibility were all given as barriers to modal switching. This suggests that for car commuters, well-targeted policy interventions could provide practical alternatives that would appeal to those who currently rely on private motorised transport. Understanding citizens' perceptions, behaviours and activities is a key element in decision-making to reduce transport related air quality emissions and concentrations