• Energy Research

Abstract Improvements of energy efficiency and reduction of Electricity Consumption (EC) could be pushed by increased knowledge on consumption profiles. This paper contributes to a comprehensive understanding of the EC profiles in a Southwest European city through the combination of high-resolution data from smart meters (daily electricity consumption) with door-to-door 110-question surveys for a sample of 265 households in the city of Evora, in Portugal. This analysis allowed to define ten power consumption clusters using Ward's method hierarchical clustering, corresponding to four distinct types of annual consumption profiles: U shape (sharp and soft), W shape and Flat. U shape pattern is the most common one, covering 77% of the sampled households. The results show that three major groups of determinants characterize the electricity consumption segmentation: physical characteristics of a dwelling, especially year of construction and floor area; HVAC equipment and fireplaces ownership and use; and occupants’ profiles (mainly number and monthly income). The combination of the daily EC data with qualitative door-to-door survey-based data proved to be a powerful data nutshell to distinguish groups of power consumers, allowing to derive insights to support DSOs, ESCOs, and retailers to design measures and instruments targeted to effective energy reduction (e.g. peak shaving, energy efficiency).

Abstract An aging building stock and low-efficiency heating, ventilation and air conditioning (HVAC) systems may be preventing the adequate energy performance (EP) of Portuguese dwellings. This study aims to estimate and analyze the EP gap of the occupied main residence Portuguese residential dwelling stock, for thermal comfort attainment, at high geographical resolution scale, i.e. for every civil parish. A building typology approach was applied to estimate the heating and cooling (H&C) theoretical final energy consumption (TFEC) for thermal comfort. An energy consumption statistics-based approach was used to estimate the H&C real final energy consumption (RFEC). The EP gap is the percentual difference between the TFEC and RFEC. Three scenarios were tested, looking deeper into southern European space H&C patterns, considering varied conditioned areas and occupancy schedules. This study provides a methodological framework for zooming in the assessment of the dwelling stock EP for a whole country, allowing for a comparative analysis between regions, as the different regional EP gap drivers are identified. For nominal conditions, every civil parish has an EP gap higher than 60%, for both H&C, related to poor energy efficiency of the building stock and low H&C energy consumptions. The scenarios demonstrated a bridging of several civil parishes’ EP gap, possibly resulting from temporal space climatization patterns. High remaining EP gaps suggest the civil parishes in the north and center inland regions are the most vulnerable in the winter and summer seasons, potentially due to significant energy poverty levels.

Abstract Daily electricity consumption profiles from smart meters are explored as proxies of active behavior regarding space heating and cooling. The influence of the environment air temperature (multiple maximum and minimum daily thresholds) on electricity consumption was explored for a final sample of 19 households located in southwestern Europe (characterized by hot, dry summers and cool, wet winters), taking the full year of 2014. Statistical analysis of the deviations from hourly average electricity consumptions for each temperature thresholds was performed for each household. Firstly, these deviations could act as proxies highlighting possible lack of thermal comfort on space cooling, and partially on space heating, supported by door-to-door survey data, on socio-economic details of occupants, buildings bearing structure and equipment's ownership and use. Secondly, meaningful differences of consumers' behavior on electricity consumption pattern were identified as a response for space heating and cooling to the environment air temperatures thresholds. Additionally, statistical clusters of active and non-active behavior groups of households were assessed, showing the electricity use for space heating. This paper illustrates the importance of the widespread use of smart-meters data on the increasingly electrified buildings sector, to understand whether and how thermal comfort could be achieved through active climatization behavior of its occupants. This is particularly important in regions where automatic HVAC systems are almost absent.

This article examines the multidimensional problem of energy poverty, focusing on its connections to climate change and its manifestation at rural and urban scales across selected European countries and Israel. The study examined 31 locations in eight countries with diverse geographical and economic backgrounds: Bosnia and Herzegovina, Greece, North Macedonia, The Netherlands, Portugal, Spain, Slovakia, and Israel. The article aims to understand how winter energy vulnerability in rural and urban locations in these countries could be identified using selected energy poverty indicators and how it evolves under the influence of climate change. A set of sociodemographic, infrastructural, and economic variables, combined with climate analysis, were selected and assessed for their impact on energy poverty. We found that energy poverty in most countries depends significantly on location and regional development. Due to a combination of factors influencing energy poverty, rural households tend to be more vulnerable. Furthermore, climate change consequences will likely leave rural areas more likely to experience energy poverty in the future.

Fuelwood has been overlooked by European energy transition policies, despite its importance as a domestic energy source for many European households. We study fuelwood use for coping with energy poverty based on the lived experience of energy-vulnerable households in five diverse European countries (Portugal, Slovakia, Hungary, Austria, and North Macedonia). From their perspective, fuelwood is a central and multifunctional tool for coping with energy poverty because of its many favorable features, including enabling energy security and access, that overweigh its adverse environmental and health impacts. We argue that the use of fuelwood for coping with energy poverty is embedded in cultural practices building upon the interconnection of three stages of coping behavior. The first stage is fuelwood becoming a socio-cultural norm, which means it is considered a cultural practice for coping with energy poverty due to its many benefits that protect the energy vulnerable from increasing energy prices, disconnections, and further energy deprivation. This enhances the subsequent phase, featuring the normalization of subsistence which is the acceptance of life with minimal energy needs. This leads to the final stage with increasing system detachment which is continued reliance on individual and informal arrangements of satisfying energy needs and avoiding seeking or demanding institutional support This article is based upon work from COST Action European Energy Poverty: Agenda Co-Creation and Knowledge Innovation (ENGAGER 2017-2021, CA16232) supported by COST (European Cooperation in Science and Technology – www.cost.eu). Ana Stojilovska is grateful for the support provided by the Centre for Social Sciences, Hungary, and the Central European University Doctoral Stipend. Dušana Dokupilová thanks to the support of VEGA grant no. 2/0186/21. Anna Zsófia Bajomi would like to thank Lea Kőszeghy, Centre for Social Sciences, Hungary, and lead of the “Societal challenges of energy use” project supported by the Incubator – Collaborative Research Fund. Sergio Tirado-Herrero acknowledges funding from the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie (grant agreement TRANSFAIR No. 752870) and funding from the ‘Ramón y Cajal’ program supported by the Spanish Ministry of Science and Innovation (grant RYC2020-029750-I). João Pedro Gouveia acknowledges the support provided to CENSE by the Portuguese Foundation for Science and Technology (FCT) through the strategic project UIDB/04085/2020

This paper briefly illustrates a method to represent national energy systems and the geographical details of CCS infrastructures in the same technical-economic model. In the MARKAL-TIMES modeling framework a model of Morocco, Portugal and Spain with both spatial and temporal details has been implemented. As a function of assumptions on the development to 2050 of mitigation levels, economic growth and CO2 capture-transport storage characteristics, dozens of scenarios were prepared with the TIMES-COMET model. A few results on optimal levels of CCS contribution to mitigation compared to other energy system options are presented. The results also indicate the least cost lay out of the main capture, transport and storage infrastructures. It is concluded that the availability of CCS after 2020 will reduce the cost of mitigation in the Iberian Peninsula as soon as the EU GHG emissions reduction targets become more stringent than decided so far.

Abstract The deep decarbonisation of the power sector coupled with electrification of end-use sectors will be crucial towards a carbon neutral economy, as required to achieve the Paris Agreement's goal. Several studies have highlighted the relevance of electrification under deep decarbonisation. However, previous work does not explore what would be the major shifts towards electrification, i.e., in what economic activities it will likely occur and when up to 2050 considering gradually stricter GHG emissions constraints. This is of upmost relevance since relatively small variations in emission caps may trigger substantial modifications in specific components of the energy system, namely the shift for the electrification of a particular energy end-use, with impacts on the power sector’s portfolio. In this paper, we analyse the extension of the electrification of the energy system as a cost-effective strategy for deep decarbonisation. We set a large number of increasingly stringent mitigation caps to assess: (i) the degree of electrification of different energy end-uses across all economic activities, (ii) the impact in power sector portfolio and costs and (iii) investment needs. The novelty of this paper relies on the anticipation of electrification of activities traditionally supplied by non-electricity energy carriers, by exploring when and how such transformation may occur in the future, and how much it would cost. We assess the case of Portugal till 2050 by using the TIMES_PT model to generate 50 increasingly stricter decarbonisation scenarios. In the long term, incremental changes (+1%) in more aggressive decarbonisation targets (beyond −70% reduction) induce substantial increase in the share of electrification growth rates. Electric private vehicles, electricity-based steam and heat production in ceramic industrial sector and heat pumps in buildings are the most cost-effective electric technologies. We found that a decarbonisation up to near −80% of 1990′s levels of the Portuguese energy system does not have a significant impact on the power sector unit costs, and does not surpass historic values for some years. However, it should be noted that incremental changes (+1%) in more aggressive decarbonisation targets may increase sharply electricity costs in 2050 (+9%). Thus, focusing in only few scenarios may narrow the role of electrification (or other mitigation options) and its associated costs for deep decarbonisation. This paper allows researchers, planners and decision makers to enhance awareness regarding the relevance and cost-effectiveness of electrification under decarbonisation, namely its feasibility and affordability, providing fruitful insights.

In the Mediterranean area most of the public authorities need to enhance their institutional capacity in the field of Energy Efficiency (EE) and use of Renewable Energy Sources (RES) in order to contribute to the Energy Performance of Buildings and the Energy Efficiency Directives, developing solutions suited to various regional contexts. The PrioritEE project, funded by the Interreg MED programme, aims at reinforcing the capacities of public administrations in selecting and implementing eco-friendly and cost-effective energy planning measures. This paper aims to describe the main efforts carried out by local public authorities and professional institutions from five MED countries (Italy, Portugal, Spain, Greece and Croatia) in order to reduce energy consumption and prioritize EE investments in Municipal Public Buildings (MPBs). In particular, it focuses on the methodological framework describing the main components of the proposed toolbox, the main objectives and expected outcomes but also the current achievements and the way forward.