Energy, Sustainability and Society最新文献

Background

District Heating (DH) is a technology that provides heating and domestic hot water to buildings and is an important technology for supporting the European energy transition. As such the heating systems increasingly resort to renewable heat sources and waste heat, it is even more important that they operate in the most efficient way possible. DH companies have access to the primary network of which they can impact system performance. To maximize the efficiency of the system, however, it is important that the system at the building level, known as the secondary system, is also efficient; otherwise, overall system efficiency is reduced. To increase system efficiency, return temperatures from the secondary system into the primary system have been targeted through motivational tariffs. There is limited information on how to establish a motivational tariff that motivates the customer to improve both the primary and secondary systems, which is a gap that this paper aims to fill.

Results

In this paper, the impacts of retrofit actions in secondary systems are assessed through simulations. The identified relevant refurbishment measures to lower the return temperature to the primary system are variable flow pumps, low-temperature radiators, parallel heat exchangers, and a pass-through DHW system. Apart from simulated refurbishments, we also identify that the secondary system sometimes generates excess heat, which is valuable to recover, especially during peak load periods for the primary system. Hence, motivational tariffs targeting secondary system efficiency should also encompass an incentive for the customer to make use of waste heat in the secondary circuit to lower peak demand for the DH system.

Conclusions

To date, the most commonly used parameters introduced to customers are linked to the flow of water through the customer’s asset and the bonus malus principle. The results from simulations show that DH companies can introduce additional parameters to support customers in guiding their secondary system to perform more efficiently. Increased overall system efficiency has a positive impact on both costs and emissions.

Background

With sustainable bioenergy in the European energy mix, intermediate bioenergy carriers (IBC) become of growing importance, as they can ensure a more efficient utilisation of biomass feedstocks from agricultural and forest residues. A high potential for market uptake is foreseen for fast pyrolysis bio-oil (FPBO), one of several IBCs. While facing the chicken and egg problem in market entry, the aim of this study was the development of adequate strategies to support market implementation. The case study findings and methodological approach can provide policymakers, industry, and a broader audience with a vision for addressing similar challenges in market adoption of innovations in the bioeconomy and beyond. Therefore, we tested a new PESTEL + I approach and its practical applicability to an IBC value chain.

Results

With an adopted PESTEL method, we analysed a promising value chain in which FPBO is produced from sawdust in Sweden and Finland, transported to the Netherlands and upgraded and marketed as a marine biofuel. Our results show that the market uptake of IBCs such as FPBO and subsequently produced biofuels is above all driven by the European Renewable Energy Directive II (RED II). In Annex IX Part A, sawdust is listed as a feedstock for advanced biofuels, which can be double counted towards the 14% renewable energy share goal in the transport sector in 2030. To support the use of advanced biofuels in the maritime and aviation sector, the proposal for revision of RED II 2021 contains a new multiplier (1.2x) for fuels delivered to these sectors, while all other multipliers are deleted. These legal European obligations and implementation into national law of member states create strong incentives for many downstream market actors to use advanced biofuel. However, technological challenges for FPBO use still hamper fast market introduction.

Conclusions

Overcoming technology challenges and the creation of long-term validity of guidelines and regulatory framework will create stable market conditions, investment security and finally stimulate long-term offtake agreements between feedstock providers, technology developers and downstream customers. The approach and findings can provide a vision to overcome similar challenges in other bioeconomy innovations’ market uptake and beyond.

Background

Uganda’s energy relies heavily on biomass sources. This dependence on biomass for household and commercial purposes, driven largely by population increase, poses pressure on natural resources, such as forests. This study investigates the usage of some of the country’s largely produced agricultural wastes for the production of biofuels.

Methods

Pineapple peels (PP), banana peels (BP) and water hyacinth (WH_Eichhornia crassipes (Mart.) Solms) were used for generation of both carbonized and uncarbonized briquettes. Physical properties and calorific values for the developed briquettes were determined through thermogravimetric analysis and using a bomb calorimeter.

Results

Pineapple peel carbonized briquettes had the highest calorific value (25.08 MJ/kg), followed by a composite of banana peels and pineapple peels (22.77 MJ/kg). The moisture content for briquettes ranged from 3.9% to 18.65%. Uncarbonized briquettes had higher volatile matter (ranging between 62.83% and 75.1%) compared to carbonized briquettes (ranging between 22.01% and 24.74%). Uncarbonized briquettes had a shorter boiling time (ranging between 27 and 36 min for 2.5 L of water) compared to carbonized briquettes (ranging between 26 and 41 min). Bulk density was highest in uncarbonized BP briquettes (1.089 g/cm³) and compressive strength was highest with carbonized BP + PP (53.22 N/mm²). When using water hyacinth alone, the produced carbonized briquettes show low calorific values (16.22 MJ/kg). However, the calorific values increased when they were mixed with banana (20.79 MJ/kg) or pineapple peels (20.55 MJ/kg).

Conclusions

The findings revealed that agricultural wastes could be used to augment the energy sources pool to protect the environment and create social stability in the community.

Background

Alternative fuels made from biomass or CO₂ and water using renewable energy can reduce CO₂ and pollutant emissions compared to fossil-based mobility and thus support a transition to a more sustainable transport. The adoption of alternative fuels in transport will ultimately depend on public acceptance and drivers’ willingness to use them. Little is known if and under which circumstances people would accept alternative fuels and which narratives and cognitive beliefs might underlie these usage intentions. Moreover, it is unclear if and how laypeople distinguish between different alternative fuel types in their perceptions, e.g., between fuels made from biomass (biofuels) and fuels produced using electricity (e-fuels). To address the research gap, this study empirically investigated laypeople’s beliefs and expectations towards alternative fuels and preferences for different fuel types. Understanding preferences for fuel types could help in steering public information, support managerial decisions and communication pathways, and promote the roll-out process of fuel innovations.

Results

Laypeople expected alternative fuels to be made using renewable feedstocks and to not contain gasoline or diesel. Whereas alternative fuels were believed to have advantages concerning environmental and toxic effects and safety compared to diesel and gasoline, they were associated with practical disadvantages for drivers. It was shown that although e-fuels and biofuels both fall under the definition of ”alternative fuels”, laypeople distinguish between them in evaluations of safety, costs, and resource competitiveness: E-fuels were preferred over biofuels and believed to have a lower competition for resources than biofuels. They were also evaluated to be more expensive and comparably less safe to use. Moreover, different adopter groups were identified for both fuels.

Conclusions

The study has highlighted both adoption drivers and barriers for alternative fuels: Reduced environmental impact could be an important positive factor. In contrast, drawbacks feared by laypeople regarding a low range and an expensive fuel price could be barriers for alternative fuel adoption because they reflect current technical challenges for these fuels. Thus, a more cost-efficient production and higher fuel efficiency should be considered in an acceptance-optimized alternative fuel production.

Background

The Republic of Serbia (RS) is strategically oriented towards sustainable development, but the implementation thereof faces different limitations and problems. RS emits substantial pollution caused by fossil fuels, and pollution from agricultural sector characterized by inefficient use of energy and intensive use of fertilizers. Bearing in mind the significant agricultural capacities and the orientation towards rural development, a special green transformation must be implemented in this domain. Taking into account the specificities and tradition, the introduction of the circularity concept can be considered the most acceptable. Research on readiness for transition to circularity in RS rural areas has not been conducted; therefore, the goal of the paper is to develop a concept for assessing the capacity of rural areas for circularity. This study is the first scientific proposal that aims to provide input for policymakers, thus contributing to the creation of a new identity of RS, whose development is based on the principles of sustainability.

Methods

The study was conducted as conceptual research, with the objective of examining an undiscovered phenomenon without empirical evidence and incorporating the targeted phenomenon into a conceptual framework, while providing a proposal for a solution model based on an interdisciplinary approach—the application of qualitative and quantitative methods (aggregation of composite indicators and Delphi method).

Results

Paper results can be summarized as follows: (a) qualitative analysis of policy framework related to RS transition towards circularity (which shows that regulation is insufficient or non-existent, so conceptual research at this stage is necessary and only possible); (b) research questionnaire; (c) original set of indicators for measuring capacity for circularity (derived from the questionnaire); (d) concept of index of capacity of agriculture and rural areas for circularity (based on a set of indicators); and (e) concept of the monitoring of circularity implementation.

Conclusions

The main research findings presented in this paper could be beneficial for countries at early stages of introducing circularity, having both low and high agricultural potential. With slight modifications, they can also be applied to other economic activities.

Background

Renewable energy, especially wind power, is expanding rapidly in Sweden and elsewhere and has left the “niche” to become part of the mainstream energy socio-technical “regime”. However, the social innovation of community-owned wind energy is not expanding alongside. Despite its potential for an inclusive energy transition and for alleviating conflicts, community energy remains a niche phenomenon. In this article, we explore the conditions for community energy to scale up. Upscaling is sometimes regarded as alien to the spirit of community energy, but we argue that it can be positive and, assuming the existence of a “community wind energy trap”—increased market competition and decreased governmental support—even necessary for the long-term survival of community wind energy. We particularly study how two variables relate to upscaling: autonomy and community, the latter divided into communities of interest and place.

Results

A case study on four wind cooperatives and their main partners, municipal energy companies, based in western Sweden is conducted to generate a theory of how autonomy and community are related to their ambitions and capabilities to scale up their operations. The results indicate that for scaling up, autonomy is a more important factor than community, while communities of interest are more likely to scale up than communities of place. A provisional theory on possibilities for community energy to scale up is developed based on the case study results.

Conclusions

Even when upscaling is the will and ambition of a community energy initiative, neither autonomy nor community alone is a guarantee for it to happen—yet in combination, the likelihood increases: with autonomy as a prerequisite for action, and community as a motivation for action. Both communities of place and of interest can act as a motivational force and mobilise resources. Yet local rootedness can be difficult to combine with upscaling beyond a certain point, while a community of interest lacks physical borders. If regulators are keen on counteracting the community energy trap, our research suggests that they need to intervene and support these initiatives—yet without intruding on their autonomy.

Background

This study aims to explain the policies implemented by the European Union in transitioning to a green economy. It examines the period from the adoption of sustainable development within the Union to the present, focusing on the EU's strategies for sustainable development and the green economy.

Main text

The study reveals that the European Union has long recognized environmental problems and the impacts of climate change, starting from the 1990s. In response to the global crisis in 2008, the EU embraced the opportunity to build a dynamic, low-carbon, resource-efficient, knowledge-based, and socially inclusive society. Green investments were included in the EU's rescue plan, initiating the green transformation. The study explains the concepts of sustainable development, the green economy, and green growth. It discusses how the European Union implemented its green transformation, particularly through the examination of the European Green Deal. Furthermore, it explores the developments related to climate change and the green economy within the framework of the European 2020 strategy.

Conclusions

The findings highlight the European Union's commitment to addressing environmental challenges and transitioning to a green economy. Future research should focus on assessing the effectiveness of implemented policies and strategies in achieving sustainable development goals. The EU allocated a substantial portion of its budget to support green investments, including green incentives during the 2008 financial crisis, and significant budgets from member states like Germany and France. The EU has set ambitious targets for reducing greenhouse gas emissions, aiming for at least a 40% reduction by 2030 compared to 1990 levels and becoming carbon-neutral by 2050. Future research should also explore the social and economic implications of the green transformation, including job creation and industry competitiveness, to provide valuable insights for policymakers and researchers. This will contribute to enhancing the EU's green policies and advancing the transition to a sustainable and environmentally conscious economy.

Background

The main goal of the paper is to define, analyze and assess the basic security, development and institutional challenges faced by the Central Asian countries after 2022. Following the COVID-19 pandemic, and with the outbreak of the Ukrainian crisis, Europe faced problems in ensuring energy security, which were further complicated by its decision to stop importing natural gas from the Russian Federation. The Central Asian region is rich in energy resources, but at the same time, it is also a region of special geopolitical interest of often-conflicting parties, characterized by limited information and insufficient academic literature about development, various aspects of security, internal specificities and future challenges.

Methods

The research included qualitative and quantitative analyses carried out for Kazakhstan, the Kyrgyz Republic, Turkmenistan, Uzbekistan, Tajikistan and Germany. Data processing was performed based on 16 selected indicators in the fields of economy, energy, governance and climate change, for the time period 2011 to 2021. Data processing was performed using correlation and regression analysis (ANOVA).

Results

The results showed that corruption represents one of the biggest problems faced by the countries of Central Asia, with the biggest variations in the calculated Standardized Confidence level, which shows that this indicator trend, in relation to the 16 indicators used, is the least predictable. This represents a significant problem for all countries that are supplied with energy products from this region, or plan to do so. Energy security is positive only in the case of Turkmenistan. Regression analysis shows that Kazakhstan reported the best positive trend for most indicators. Data for Germany show consistent values over the observed period.

Conclusions

The main conclusions of the paper indicate that the countries of Central Asia have certain specificities when it comes to sustainable development, where energy security, corruption and government efficiency can be considered the biggest problems. The European Union must find ways and mechanisms to overcome these and many other impediments if they decide to import energy products from the aforementioned region.

Background

Hydropower is a mature energy technology and one that could play a more important role in providing clean and reliable energy. In small-scale contexts, hydropower is useful for providing electricity access, balancing intermittent resources, and as a potential source of energy storage. This paper provides a comprehensive exploration of the development of the small hydropower (SHP) sector in Indonesia, the world’s fourth most populous country.

Methods

Two research methods were employed: secondary data analysis through a desk review of relevant literature and primary data collection through site visits and expert and stakeholder interviews. Two case studies of micro-hydro applications in community-based rural electrification were analyzed. The paper explores how SHP projects were initiated, lessons learned, and policy recommendations of relevance to further development of distributed small-scale renewable energy in Indonesia.

Results

The sector commenced during the Dutch Era and now centers on both community-based rural electrification projects and commercial schemes under the independent power producer (IPP) approach. Since the late 1980s, initiatives to implement SHP for rural electrification have flourished through various programs. Key regulatory, economic, and technical barriers include inconsistent and unclear supporting regulations, especially regarding electricity prices; artificially low retail electricity prices; capital and borrowing constraints; advantages provided to fossil fuels; limited technical experience and capabilities of project developers and project sponsors; risks from floods, earthquakes, and landslides; constraints on supporting infrastructure; and limited grid links. The most successful and sustainable SHP projects are ones that provide local economic benefits and for which local communities are empowered with ownership and have responsibility for maintenance.

Conclusions

SHP will remain small from a macro perspective but could still play a key role in further improving energy access and equity in remote areas. Key initiatives to facilitate this development could include local-level capacity building and project participation and the adequate pricing of negative externalities from fossil fuel projects. Indonesia’s long experience with SHP carries lessons for other developing countries.