Blockchain Papers

Vikas Khare, Monica Bhatia, Miraj Ahmed Bhuiyan

No abstract is available for this record.

Mohammad Bostani, Roohollah Rafee, Saman Rashidi

• Fully integrated trigeneration systems are not yet deployed in the MENA Region • The key components of trigeneration systems are already proven in MENA. • PVT-based systems support typical rural demands of 9–55 kW of power, and 18–143 kW of heat. • PVT-based systems can generate a typical rural freshwater demand of 8–14 m 3 /day. • Performance of PV/T-based systems in MENA desert climate can be enhanced by PCMs. • The SGSP can support MED and HDH units, water and space heating, and small power cycles. Solar-based cogeneration systems offer a promising pathway for low-carbon, decentralized development in rural areas of the Middle East and North Africa (MENA). While fully integrated triple-generation systems remain unimplemented, key components, such as PV mini-grids, PV-powered desalination units, solar pumps, and solar water heaters, have proven effective. PV/T-based systems can generate 9–55 kW of electricity, 18–143 kW of thermal energy, and 8–14 m3 of freshwater per day, aligning with typical rural demands and leveraging the region’s high solar irradiation and brackish groundwater resources. To realize this potential, challenges such as solar intermittency, efficiency losses, high upfront costs, and fossil fuel subsidies must be addressed through field pilots, advanced control strategies, anti-scaling/anti-soiling solutions, cost-effective thermal storage, and innovative financing mechanisms.

Arzu Alvan, Sina Kısacık, Nalan Gelirli

Renewables have moved from the sidelines to the center of policy and investment. Evidence from IEA, IRENA, REN21, and recent studies shows steep cost drops in solar and wind, record capacity growth, and more jobs. Environmental gains (lower GHGs, cleaner air and water, smarter land use) come with economic and social upsides (jobs, energy security, rural access via decentralized systems). But real constraints persist: grid congestion, curtailment, flexibility gaps; high financing costs and regulatory uncertainty in emerging markets; supply chain risks; and community concerns over siting and land rights. The challenge has shifted from tech costs to system integration and governance—durable policies, markets that value flexibility, quicker permitting, and just transition tools. Priorities ahead: operating high VRE under extremes, long-duration storage and sector coupling (hydrogen, heat, industry), critical minerals and circularity, resilience to climate and cyber risks, and effective de-risking in the Global South.

Phemelo Tamasiga, Valentine Munyaradzi Dzingai, Helen Onyeaka, Rose Daphnee Tchonkouang · 7 authors

• The global energy transition impacts food security in developing countries. Renewable energy improves agricultural productivity but creates trade-offs like land and water competition. • Agri-voltaic systems enhance crop yields and energy efficiency. They help balance food and energy production, reducing fossil fuel dependency. • Renewable energy projects can increase food prices in vulnerable regions. Financial incentives, social protection, education, and public-private partnerships to make renewable energy adoption more accessible and affordable for farmers. • Renewable energy can reduce agriculture’s operational costs but high initial investments limit smallholder farmers. The study recommends subsidies, training, and financial support to help farmers adopt renewable energy while ensuring food security is maintained. • There is an eminent need for an interdisciplinary approach to understanding energy transitions’ impacts on food security and long-term sustainability. Transitioning to net-zero societies affects how energy is produced and consumed, with consequences for food security. Through a systematic review of 43 peer-reviewed studies that follow the PRISMA protocol, results reveal that renewable energy can enhance agricultural productivity by reducing operational costs, increasing efficiency in irrigation and processing, and providing reliable access to energy. However, challenges exist, including competition for land and water resources between renewable energy projects and food production, high upfront costs of clean energy technologies, limited access to credit facilities, and institutional bottlenecks. To overcome these challenges, recommended policies include offering subsidies and financial incentives to make clean energy more affordable for farmers, as well as providing education and training to support the adoption of sustainable practices. Furthermore, promoting collaboration between the public and private sectors is crucial to stimulate investment in renewable energy infrastructure. Moreover, these policies must be designed for specific national circumstances. High-income or upper-middle-income countries can deploy capital-intensive agrivoltaic and biogas technologies via concessional finance. In contrast, low-income settings should prioritize low-cost, decentralized solar pumps and off-grid dryers to build farmer confidence and trust. Countries with stronger regulatory frameworks and secure land tenure systems are better equipped to support large-scale renewable energy projects. At the same time, regions with weaker governance tend to benefit most from community-owned mini-grids. The mapping of policy options onto economic, institutional, and agro-ecological dimensions provides a nuanced, context-sensitive framework to guide equitable and effective energy transitions in diverse agricultural landscapes.

Ye Luo, Jieling Shen, Hanwei Liang, Lu Sun · 5 authors

No abstract is available for this record.

Alex Hongliang Zhang, Selahattin Murat Şirin

Abstract Non-technical summary DPV systems, typically small to medium-sized solar power installations on buildings, which primarily and directly supply electricity to industrial, commercial, or residential consumers in proximity. DPV is an advocated renewable substation for climate change and energy saving for merits of low installation costs, high energy efficiency, and the ability to provide decentralized power supply. Our research has theoretical significance in explaining and understanding the development and policy evolution of DPV in China and provide valuable suggestions for future industry policies during grid parity. Technical summary Since 2021, China has been phasing out its decade-long feed-in tariff policies, reducing the photovoltaic industry's dependency on subsidies. Despite the challenges posed by declining electricity prices and slowdown in economic growth, the authorities continue to prioritize the development of DPV due to its low investment costs, high energy efficiency, and decentralized power supply, and these technologies have already achieved demand-side parity. Driven by this phenomenon, this study examines the trajectory of DPV diffusion and the evolution of related policies over the last decade. It unravels the dynamic mechanism of DPV investment through theoretical analysis and develops a macro model to identify optimal installation strategies and renewable energy proportions. Our findings highlight the increasing role of green energy and suggest that green finance is crucial for stimulating DPV investment in the era of grid parity. The study concludes with practical recommendations for overcoming DPV challenges in China. Social media summary DPV has become a prominent renewable energy solution in other countries but not in China. We probe the system dynamics modeling to give explanation and solution during grid parity.

Scott Evans, John Carbone, Chris Reynolds

No abstract is available for this record.

Michael M. Santos, Ana Teresa Vaz Ferreira, João Lanzinha

Africa has abundant solar resources but only 2% of its current capacity is generated from renewable sources. Photovoltaics (PV) offer sustainable, decentralized electricity access to meet development needs. This review synthesizes the recent literature on PV in Africa, with a focus on Mozambique. The 10 most cited studies highlight the optimization of technical components, such as storage and bifacial modules, and challenges in integrating large-scale PV. Case studies demonstrated Mozambique’s potential for PV applications in water heating, irrigation, and rural electrification. These benefits include reduced emissions and energy access. However, barriers, such as high costs, lack of infrastructure, and training, exist. While solar cookers are insufficient, thermal systems have unrealized potential. Mozambique’s urban and rural electrification rates are 57% and 13%, respectively, despite its energy resources. Targeted policies, financing, and community engagement are essential for promoting adoption. While PV can sustainably expand electricity access, coordinated efforts must address costs, infrastructure, maintenance, and social factors for successful implementation. Mozambique has immense solar potential, but strategic planning and support are critical to unlocking these benefits. This review provides insights into optimizing PV systems and policy frameworks for a clean and inclusive energy production future in Africa, to synthesize the 10 most cited studies on photovoltaic solar energy in Africa, and to deeply reflect upon the current energy needs in Mozambique, the benefits of employing PV and solar thermal systems, and the challenges of implementing such systems within the Mozambican context.

Nallapaneni Manoj Kumar, Shauhrat S. Chopra

No abstract is available for this record.

Raúl Vega-Marcos, Antonio Colmenar‐Santos, Francisco Mur, Clara Pérez · 5 authors

The Green Pact signed by the European Union establishes a trend towards renewable energies to combat the greenhouse gas emissions. Among the technologies used to produce this type of energy, wind power generation technology stands out, which, in countries such as Spain, already has significant installed power. The main problems posed by this technology plans are the uncertainty intervals of wind power and its inclusion in the electricity market, due to the complex price system that does not always favor the producers. The main purpose of this research is to promote the installation of more wind power plants. For this, the installation of cryptocurrency mining equipment is proposed, which will be powered by the generation produced by these wind power plants. The article analyzes the production of cryptocurrencies is a growing business. In the research process, the latest cryptocurrency mining equipment is evaluated. It is analyzed which equipment is the most suitable for its installation in the wind power plant and an economic study is made for the construction project of a large wind power plant. Finally, it will be seen that in this way the amortization time of the facilities decreases and also the project is more attractive for the investor since they can decide between injecting energy into the electrical network or mining cryptocurrencies. If a wind power plant invests in cryptocurrency mining in parallel to the production of electrical energy for the grid, it can decide when to enter the electricity market pool or engage in mining. In this way, the idea of building many more wind power plants becomes more attractive. This would lead to a market where this renewable energy would be much more abundant and the price curve would shift to a lower price, as well as a significant reduction in greenhouse emissions.

Masoud Rezaei, Alireza Boushehri, Naser Bagheri Moghaddam

Using a variety of solar power plants is one of the solutions governments use to respond to energy and sustainable development needs. While Iran has a strong potential for using solar energy, the application of solar energy, especially through PV technology, has been limited due to the country’s richness of fossil fuels and their low prices. Therefore, it is important to adopt effective strategies and policies to promote the development and application of this technology. The purpose of this study is to identify factors affecting the use of photovoltaic technology in Iran. To this end, 142 factors were first identified through a comprehensive review of the literature. Then, all of these factors were prioritized and categorized by “semi-structured interview” with 15 energy policy experts. The “content analysis” of the experts’ opinions showed that only 59 of these factors were considered important at the sectorial level for Iran. Based on the same content analysis, a conceptual framework for the application of decentralized photovoltaic power plants in Iran was developed. The framework shows that 10 generic categories of factors should be considered by policy-makers at the solar energy sector to promote PV technology application in Iran. They include policy factors, institutional factors, finance and budgeting factors, system economy factors, macroeconomic factors, socio-cultural factors, human resource factors, factors influencing capabilities of industries, technological and related infrastructural factors, geographical, climatic and environmental factors, and foreign political factors. It is also emphasized that all these categories should be considered at three levels: industry (electricity industry) level, national level, and international level. Thus, renewable energy policy-makers in Iran should take into account all means that influence these factors in order to improve the conditions for decentralized photovoltaic technology application.

Arda Işıldar

The well-being of the society depends on a number of metals, including base metals, precious metals and increasingly rare earth elements (REE). The usage of these metals increased in numerous applications, including electrical and electronic equipment (EEE), and their interrupted supply is at stake. There is an increasing interest in the secondary sources of these metals, particularly waste electrical and electronic equipment (WEEE) in order to compensate their potential supply deficit. This PhD thesis demonstrates the advantages and bottlenecks of biological and chemical approaches, as well as the advances and perspectives in the development of sustainable processes for metal recovery from WEEE. Furthermore, a novel process for the recovery of metals from WEEE is described, and a techno-economic assessment is given.\nDiscarded printed circuit boards (PCB) from personal computers (PC), laptops, mobile phones and telecom servers were studied. Following an extensive literature review, a novel characterization and total metal assay method was introduced and applied to waste board materials. Discarded PCB contained metals in the range of (%, by weight): copper (Cu) 17.6 - 39.0, iron (Fe) 0.7 - 7.5, aluminum (Al) 1.0 - 5.5, nickel (Ni) 0.2 - 1.1, zinc (Zn) 0.3 - 1.2, as well as gold (Au) (in ppm) 21 - 320. In addition, multi-criteria analysis (MCA) using the analytical hierarchical process (AHP) methodology was applied for selection of the best-suited technology. A proof-of-concept for a two-step bioleaching extraction is given, in which 98.4% and 44.0% of the Cu and Au, respectively, were extracted. The two-step extraction procedure was applied to the chemical leaching of metals from PCB. Cu leaching was carried in an acidic oxidative mixture of H2SO4 and H2O2, whereas Au was leached by S2O32− in a NH4+medium, catalyzed by CuSO4. Under the optimized conditions, 99.2% and 92.2% of Cu and Au, respectively, were extracted from the board material. Selective recovery of Cu from the bioleaching leachate using sulfidic precipitation and electrowinning is studied. Cu was selectively recovered on the cathode electrode at a 50 mA current density in 50 minutes, with a 97.8% efficiency and 65.0% purity. The techno-economic analysis and environmental sustainability assessment of the new technology at an early stage of development was investigated.

Aviva Rutkin

No abstract is available for this record.

Agabu Shane, Shabbir H. Gheewala, Bundit Fungtammasan, Thapat Silalertruksa · 6 authors

No abstract is available for this record.

Jaroslav Havlíček, Martin Pelikán, Tomáš Šubrt

The development of renewable energy producers in rural areas creates new job opportunities for the countryside population. The decentralized manner of renewable energy in small cities is one of the ways how to meet the rural and small scale energy needs in a reliable, affordable and environmentally sustainable way. In 2010, the Czech University of Life Sciences Prague has finished the participation in the European IEE project RES COMPASS. In mutual cooperation, with seven partners from the Great Britain, France, Spain, Greek and Finland, the University has been involved in the extensive research concerning the impact of the Renewable Energy Sources (RES) on the future European labour market. The RES COMPASS project meets the objectives expressed by the New Skills for New Jobs Initiative of the EU and stressed also other initiatives, namely the Green Jobs Initiative, the UNEP initiative as well as the requirements of the International Trade Union Confederation and the International Organization of Employers in 2008. The RES COMPASS programme strategy was based on the implementation steps in three mutually supportive components: The first component Comparative analysis of the methods of identification of skill needs on the future labour market based on the renewable energy sources was concerned in the young generation of the today's students. The second component Career Orientation test was developed as a tool for the potential young people thinking about a future career in the emerging area of renewable energy. The third component focused on the future business opportunities for small and medium entrepreneurs (SMEs) in the RES sector. The paper informs about findings of the third component New businesses for SMEs in the RES. Realistic possibilities of the development of SMEs appear to exist in the provision of more complex services reacting to (1) needs of more rapid renovation of the morally depreciated devices, (2) interest of inhabitants and producers in the installations of at least two different autonomous alternative energy sources, (3) creation of informal groups of users who will share various energy sources, (4) need to support the installation of energy devices with other measures - energy audits and projects.

Akanksha Chaurey, Tara C. Kandpal

No abstract is available for this record.

Not Given Author

The reaction of public utilities to the addition (and competitive) sources of energy supplied by solar technologies will have a significant impact on the commercialization of solar energy. Decentralized applications of solar energy need utility-produced power to back up the energy produced by solar means. The cost and availability of this power will largely determine the acceptance of solar energy. There are three legal issues surrounding the role of utilities in the solar commercialization effort: (1) the extent to which utilities may own, sell, lease, finance, or service solar devices for utility customers; (2) the degree to which solar-powered utilities may be able to compete with existing utilities; and (3) the degree to which various utility rate structures will be allowed to penalize decentralized solar users. The impact of state constitutional and statutory provisions upon these issues is examined, along with relevant federal constitutional doctrines. Finally, the statutes of the National Energy Act, many of which specifically address the above issues, are discussed.