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Subject: search.filters.subject.Renewable energy

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Now showing 1 - 8 of 8
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    Energy economic expansion with production and consumption in BRICS countries
    (Elsevier Ltd, 2022-11-18) Hasan M
    Global energy demand for energy consumption is increasing day by day, and it seems complicated for most countries to meet energy demand with total energy production. In this regard, this study investigates the comparative impact of energy production and consumption on economic growth in the BRICS countries. This study conducts panel data modelling, more specifically, the fixed-effects model, random-effects, and panel FMOLS model, to find the impact of energy production and consumption on economic growth in the BRICS countries. This study finds that energy production and consumption significantly impact the economic development of the BRICS countries. More specifically, dry natural gas production and consumption, electricity generation and consumption, biofuel production, petroleum production, capital formation, and trade openness positively impact on economic growth, while coal production significantly and negatively impacts on economic growth. This research is of great significance to the economic integration of the BRICS economies.
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    Sustainable biofuel economy: A mapping through bibliometric research
    (Elsevier B.V., 2023-06-15) Hasan M; Abedin MZ; Amin MB; Nekmahmud M; Oláh J
    Biofuels have received a lot of attention as an important source of renewable energy, with number of economic impacts. This study aims to investigate the economic potential of biofuels and then extract core aspects of how biofuels relate to a sustainable economy in order to achieve a sustainable biofuel economy. This study conducts a bibliometric analysis of publications about biofuel economic research covering 2001 to 2022 experimenting with multiple bibliometric tools, such as R Studio, Biblioshiny, and VOSviewer. Findings show that research on biofuels and biofuel production growth are positively correlated. From the analyzed publications, The United States, India, China, and Europe are the largest biofuel markets, with the USA taking the lead in publishing scientific papers, engaging country collaboration on biofuel, and has the highest social impact. Findings also show that the United Kingdom, the Netherlands, Germany, France, Sweden, and Spain are more inclined to develop sustainable biofuel economies and energy than other European countries. It also indicates that sustainable biofuel economies are still far behind those of less developed and developing countries. Besides, this study finds that biofuel linked to sustainable economy with poverty reduction, agriculture development, renewable energy production, economic growth, climate change policy, environmental protection, carbon emission reduction, green-house gas emission, land use policy, technological innovations, and development. The findings of this bibliometric research are presented using different clusters, mapping, and statistics. The discussion of this study affirms the good and effective policies for a sustainable biofuel economy.
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    Common volatility in clean energy stocks
    (Elsevier B V, 2025-08-01) Pham L; Pham S; Do H; Bissoondoyal-Bheenick E; Brooks R
    This study investigates common volatility (COVOL) within the clean energy sector, motivated by the sector's growing importance and its susceptibility to external shocks. For this purpose, we use the COVOL measure developed by Engle and Campos-Martins (2023) to explore sector-wide and sub-sector common volatility, in a range of sub-sectors including renewable energy, energy storage, energy conversion, power conservation, and greener utilities. Our analysis highlights the major events that significantly impact the volatility of clean energy stocks. These include global economic disruptions, geopolitical tension, policy changes and climate-related events. Other key findings reveal the heterogeneous association of sub-sectors’ COVOL to different economic and financial factors, alongside superior explanatory power of COVOL on clean energy risk and return compared to alternative news-based uncertainty measures. These insights emphasize the importance for investors to integrate thorough risk management strategies and for policymakers to create a stable, supportive environment for the clean energy market. The study's implications extend to enhancing sector resilience and informing strategic investment and policy decisions, contributing to the sustainable growth of clean energy amidst global economic and environmental uncertainties.
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    “Stretch and transform” for energy justice: Indigenous advocacy for institutional transformative change of electricity in British Columbia, Canada
    (Elsevier Ltd, 2025-07) Hoicka CE; Regier A; Berka AL; Chitsaz S; Klym K
    Transformative energy justice addresses root causes and legacies of inequality, centers voices and world views of historically excluded communities in the problem definition, decision making and transition processes. This study offers insights from a unique case of meso-level collective action by First Nations in British Columbia (BC), Canada, aimed at transformative electricity institutional change. We collate regulatory and advocacy text to characterise the range of proposed First Nation Power Authority models and their placement along a continuum of conformative to transformative energy justice. Interviews with knowledge holders from 14 First Nations offer insight into motivations behind transformative change and how it is shaped by historical injustice alongside practical community objectives around energy security, resilience, and community development. First Nations narratives of electricity transformation are aligned with the United Nations Declaration of the Rights of Indigenous People (UNDRIP) and with goals of self-determination and incorporate relational and regional approaches. These findings validate theoretical frameworks of transformational energy justice (Avelino et al., 2024; Elmallah et al., 2022). Much of the groundwork has been laid by the collective and the regulator, while new legislation has opened a window of opportunity to increase Indigenous participation and control in the electricity sector.
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    Volatility spillovers and carbon price in the Nordic wholesale electricity markets
    (Elsevier B V, 2024-06) Lyu C; Do HX; Nepal R; Jamasb T
    This paper investigates price volatility and spillovers in the Nordic electricity wholesale markets. We use the Time-Varying Parameter Vector Autoregressive (TVP-VAR), Rolling Window-based VAR (RW-VAR), and high dimensional VAR with common factors (VAR-CF) methods and analyze the integration dynamics among these markets and impact of carbon prices on volatility spillovers. We use 107,352 hourly price data from January 2010 to March 2022. The novelty of this research is four-fold. First, we adopt a connectedness approach to explore volatility interactions among the four Nordic markets, contributing to the scarce literature on volatility in this market. Second, we segment the Norwegian market into southern and northern regions, revealing differences in volatility spillover patterns. Third, we investigate the effect of carbon prices on volatility spillovers and market dynamics. Last, we show significant contribution of covariances to interdependence among markets. We find significant connectedness between the Nordic markets, with an average Total Connectedness Index of between 50% (with a system of variance) and 90% (with a system of both variance and covariance). Sweden is the sole net volatility spillover transmitter, while Denmark experiences the largest shocks from the system. We further find that carbon prices exert a 5% significant impact on the volatility spillover index.
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    Investigating downdraft gasification of biomass : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Physics
    (Massey University, 2002) Giltrap, Donna Louise
    Gasification of biomass is a potential source of renewable energy. Downdraft gasifiers are comparatively cheap and can produce gases with low tar content. We constructed a simple, phenomenological model of downdraft gasification which we compared to both previously published data and our own experimental results. The steady-state gas compositions predicted by the model were quite close to those found experimentally, although the model tended to over-predict the amount of methane in the dry product gas. The steady-state gas composition predicted depended upon the conditions assumed at the top of the gasifier. The experimental part of this investigation looked at the effect of the air flow rate into the gasifier and the length of the gasifier bed. However, the uncertainties in the experimental measurements were too large to determine whether the experimental results followed the same trends as predicted by the model. The gasifier was run successfully using both 18.7% moisture content pine chips and 12.3% moisture content walnut shells (weight percentage, dry basis) as fuel. Both fuel types produced dry exit gases of similar compositions.
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    Rotordynamics in alternative energy power generation : a thesis presented in fulfilment of the requirements for the degree of Master of Engineering in Mechatronics at Massey University, Albany, Auckland, New Zealand
    (Massey University, 2011) Cortes-Zambrano, Ivan
    This thesis analyses and discusses the main alternative energy systems that work with rotordynamics machines to generate power. Hydropower systems, wave and ocean energy, geothermal, gas turbines, wind power, tidal energy and biofuels are the most important systems that use rotating shafts to generate power. Descriptions of the principles of vibration follow with analysis of rotordynamics. The Jeff rotor, fluid film bearings and magnetic bearings are explained. The protection of the environment is one of the most important features of renewable energy and biofuel is a crucial area. Fossil fuels are a limited resource and burning them contributes to carbon dioxide levels with catastrophic effects for the atmosphere. This thesis analyses the biofuels process in electricity generation and overviews the topic of biofuels for transport. The undesirable effects of pollution from burning fossil fuels, an increase in international petroleum prices as well as the risk of using nuclear power have combined effects that illustrate the importance of research in this area.
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    Totara Valley micro-hydro development : a thesis presented in partial fulfillment of the requirements for the degree of Master of Applied Science in Renewable Energy Engineering, Massey University, Palmerston North, New Zealand
    (Massey University, 2008) Donnelly, David Ronald
    This study focuses on the design, construction and operation of a distributed generation system based on micro-hydro technology. The project is sited in the Totara Valley, a small rural community approximately 70km from the Massey University, Turitea campus, Palmerston North. The Massey University Centre for Energy Research (MUCER) has a long history of renewable energy research within the Totara Valley community. This project complements these existing schemes and provides a foundation for future research into distributed generation technologies. The project encompasses the following objectives: - to gain practical experience in the design, engineering and implementation of a distributed generation system in rural New Zealand; - to evaluate contemporary micro-hydro technology and compare the performance of this equipment in a theoretical and practical context; - to identify barriers that hinder the widespread adoption of micro-hydro systems in rural New Zealand; - to develop a spreadsheet based life cycle costing tool. The results from this study demonstrate that economic considerations are the fundamental aspect to be considered when assessing the long-term viability of these projects. The viability of micro-hydro projects are primarily determined by four factors: - the volume and head (height) of water available above the turbine site; - the length and therefore the cost of the pipeline required for transporting water to the turbine; - the legal and administrative costs involved in obtaining a resource consent to maintain access to the water resources; - the prices received and paid for electricity. Considerable charges were payable to the local authority to secure and maintain the right to harness the water resources at this site. This cost contributed considerable risk to the project and creates a significant barrier to establishing similar systems at other sites. The reduction of resource consent charges to levels that fairly reflect the negligible environmental impacts of these projects would encourage the adoption of this technology and deliver benefits to rural New Zealand communities.