Traditional Energy Resources Research Articles

Biomass Energy from Agricultural Waste: Evaluating Groundnut Vines and Pumpkin Straws for Combustion Performance

Energy demand has risen significantly in developing countries due to rapid population growth and increase in economic activities such as industrialization, automation manufacturing and digitalization. Dependency on conventional sources of energy in both rural and peri-urban is high. Traditional energy resources lead to environmental degradation due to carbon oxide release leading global warming and deforestation which results to hydrological decline; therefore, need to come up with renewable resources from other sources such as agricultural wastes to meet the demand and solve environmental pollution problems. This study carried out an investigation on combustion and performance analysis of pumpkin straws and groundnut vines to establish their energy potential. ASTM standards were used to determine the proximate and ultimate properties. This analysis revealed moisture content (8.7-12.4%), volatile matter (63-69%), fixed carbon (11.5-18.5%), ash content (6.3-8.2%), Sulphur (0.09-0.13%), nitrogen (1.02-1.03%), oxygen (5.01-55.88%), carbon (41.8-43%) and hydrogen (5.96-6.3%). Calorific values for the briquettes were above 4389 kCal, which is above most biomass. The density and compressive strength were above 0.63 g/cm3 and 17N/mm2 respectively from compaction pressure of 150, 250 and 350 kg/cm2. The burning time was between 4 and 5.3 min, showing an increase with compaction pressure, burning rate ranged between 4.3 and 2.9 g/min, a decrease with compaction pressure increase. The specific fuel consumption portrayed an inverse relationship with calorific value and a direct relationship with compaction pressure, ranging between 166 to 176 grams per litre. Temperature-weight analysis revealed thermo stability of this feedstock, portraying resemblance to proximate analysis. Having exhibited close relationship to other agricultural wastes used for fuel, groundnut vines and pumpkin straws are a solution to environmental degradation by reducing deforestation and emissions. It is recommended that further research on mixing this feedstock with other agricultural wastes as well as making and testing of pellets be carried out to maximize energy output.

Ultrasound-assisted synthesis of Co(OH)2 nanoflowers and nanosheets as battery-type cathode for high-performance supercapacitors

The depletion of traditional energy resources and the escalating environmental concerns have compelled researchers to pursue green energies, among which the supercapacitors possess a crucial function in electrochemical energy storage systems. In this study, the Co(OH)2 nanoflowers and Co(OH)2 nanosheets have been respectively synthesized utilizing a safe and facile ultrasound-assisted method in the solvent with different pH values, and the product is denoted as Co(OH)2-7.5 and Co(OH)2-9.5, accordingly. The Co(OH)2-7.5 exhibited a specific surface area of 188.3 m2 g, significantly greater than that of Co(OH)2-9.5. Additionally, these Co(OH)2 electrode materials showed battery-type electrochemical response, and the Co(OH)2-7.5 presented an impressive specific capacity of 371.6 C g−1. When integrated into a hybrid supercapacitor (HSC) device with activated carbon (AC) as anode, the device exhibited an exceptional cycling stability after 10000 cycles at 10 A g−1. Furthermore, the Co(OH)2-7.5//AC HSC delivered an impressive energy density (De) of 30.2 W h kg−1 at the power density (Dp) of 888.6 W kg−1, and this De surpassed the 26.4 W h kg−1 of Co(OH)2-9.5//AC HSC. The Co(OH)2 in this work shows good application potential in the field of supercapacitors. The straightforward and efficient synthesis technique can be further applied to the synthesis of many other transition metal hydroxides with remarkable electrochemical properties.

Elastomeric Ionic Hydrogel-Based Flexible Moisture-Electric Generator for Next-Generation Wearable Electronics.

Rapid consumption of traditional energy resources creates utmost research interest in developing self-sufficient electrical devices to progress next-generation electronics to a level up. To address the global energy crisis, moisture-electric generators (MEGs) are proving to be an emerging technology in this field, capable of powering wearable electronics by harvesting energy from abundantly available ambient moisture without any requirement for external/additional energy. Recent advances in MEGs generally utilize an inorganic, metal, or petroleum-based polymeric material as an active material, which may produce sufficient current but lacks the flexibility and stretchability required for wearable electronics. Herein, we prepared an elastomer-based ionic hydrogel as an active material, and an MEG was fabricated by placing the ionic hydrogel on a PET sheet with two copper tapes on both sides of the hydrogel. The preparation of the hydrogel was thoroughly optimized and characterized in terms of spectroscopic analysis, swelling, water retention, and mechanical and rheological studies. The highly stretchable (350%) fabricated MEG is capable of producing a short-circuit current (JSC) of 16.1 μA/cm2, an open-circuit voltage (VOC) of 0.24 V, and a power density of 3.86 μW/cm2. The synergistic effect of the ion concentration gradient and the redox reaction on electrodes can be considered MEG's working principle. Apart from the current generation, this device is also used as a self-powered electronic sensor to monitor different physical activities by measuring breathing patterns. This prepared device is also capable of sensing the proximity of a hand. Therefore, our low-cost, easily fabricable, sustainable MEG device can be a potential aspirant for next-generation self-powered wearable electronics in healthcare applications.

State Policy In The Field Of Alternative Energy Sources In The Conditions Of Ensuring Energy Security Of Ukraine

The article analyses features of state policy in the field of alternative energy sources, particularly replacing traditional energy resources with alternative energy sources, aiming to reduce the energy intensity of Ukraine’s gross domestic product and ensure the state’s energy security. It is noted that Ukraine has significant potential for developing alternative energy sources, particularly wind energy, solar energy, bioenergy, hydropower, and geothermal energy. An analysis of the growth dynamics of the installed capacity of alternative energy source facilities operating under the «green» tariff has shown that solar energy is currently the most developed in Ukraine. This creates a foundation for further development of wind and bioenergy. The main practical benefits of energy storage systems are highlighted, including ensuring electricity supply to businesses when the external grid is disconnected, storing cheap electricity during excess capacity, and supplying it during peak demand when it is more expensive. Additionally, these systems have the potential to support and restore grid frequency. Storing surplus energy from solar power plants can increase the overall efficiency of the energy system. The author identifies the main tasks to be implemented within state policy to ensure energy security. These include investing in the restoration and decentralization of the energy system (increasing the share of electricity production from alternative energy sources, including the construction of wind and solar power plants, as well as energy storage facilities for the development of energy storage technologies produced from renewable sources), building biomethane production capacities, introducing new types of environmentally friendly fuels, increasing the construction of interconnectors with ENTSO-E to integrate Ukraine’s electricity system with the European power grid, enhancing the localization of energy storage systems, implementing innovative and efficient technologies in the electricity distribution sector, including smart grids, microgrids, and «vehicle-to-grid» systems, and resolving issues related to the «green» tariff.

Blending biomass-based liquid biofuels for a circular economy: Measuring and predicting density for biodiesel and hydrocarbon mixtures at high pressures and temperatures by machine learning approach

Circular economy is an efficient approach to deal with the rapidly increasing demand for energy and its environmental impact. It involves switching to renewable and sustainable energy sources. By providing an alternative to traditional energy resources, biodiesel promotes a circular economy paradigm that embraces renewable energies rather than fossil fuels. As an alternative to fossil fuels, liquid biodiesel helps to improve energy efficiency and reduce pollution. Furthermore, blending biodiesel has proven to be economically and environmentally viable. Knowledge of the thermodynamic properties of biodiesel, such as densities and coefficients of expansivity and compressibility, plays an important role in understanding and determining the behavior of the fuel under different operating conditions. The blend densities of Soybean Oil Biodiesel (SOB) with hexane and Waste Cooking Oil Biodiesel (WCOB) with heptane in four volume ratios were experimentally studied. An Anton Paar vibrating tube densimeter HPM DMA has been used for accurate measurements of densities of the biofuels and their blends. Density measurements were performed at temperatures ranging from 298.15 K to 393.15 K, and pressures between 0.1 MPa and 140 MPa. This work also aims to develop accurate prediction models of the properties of biodiesel blends under various conditions, such as changes in temperature and pressure, which are essential for optimizing energy production processes and engine performance. In this context, the dataset was first investigated with Tait Equation of State (Eos) to determine thermodynamic parameters which including isothermal compressibility and isobaric expansivity. It showed generally low standard deviations. Furthermore, these new experimental densities were also modeled with Artificial Neural Network (ANN) as a machine learning method. This paper models proved that the machine learning method is a suitable tool to model the thermo-physical characteristics of liquid fuels. The findings of this study have the potential to provide valuable guidance to engine engineering applications developers regarding operating conditions and the selection of suitable biodiesel for their system.

Advancing sustainable cooling: Performance analysis of a solar-driven thermoelectric refrigeration system for eco-friendly solutions

The solar-powered thermoelectric refrigerator (SPTR) is an innovative approach that uses solar energy to cool spaces. Its effectiveness relies on solar insolation rates and an intelligent dual-axis solar tracking system (STS) that maximizes solar energy capture. Performance analysis of SPTR with the fixed panel solar system (WST) and dual-axis STS by keeping the SPTR at a standard ambient temperature of 25 °C was carried out under local climate conditions. The experimental test setup includes a thermoelectric refrigerator (TER), thermoelectric module (TEM), solar panels, and STS. The experimental findings showed that the coefficient of performance (COP) of SPTR depends on the solar irradiance, the system's input power, the surface temperature of the solar panels, and the cooling rate. The maximum and minimum values of COPs were 1.19 and 0.27 for directly coupled SPTR with a WST and 2.07 and 0.39 for STS, respectively. Compared with the stand-still solar system, a COP enhancement of 44–75 % is achieved. The results also show that the cooling load is a function of the refrigerated space, and the products are to be cooled, which is affected by the thermoelectric properties of the TEM. The cooling rate is recorded at its maximum when the system is operated using an STS on a clear sunny day with a maximum solar insolation rate. The SPTR has proven to be environmentally friendly, the best alternative to conventional cooling systems, and sustainable due to the independence of traditional energy resources.

CUTTING-EDGE BIOFUEL TECHNOLOGIES FOR ENVIRONMENTAL MANAGEMENT AND SUSTAINABILITY

Researchers focus on finding Renewable Energy Sources (RES) and green energy for a sustainable future owing to ecological sustainability standards, growing power demands, depletion of traditional energy resources, and ecological damage caused by global warming and climate change. Bioenergy is a very viable option as it may be used for various energy needs via appropriate conversion methods. This analysis focuses on the promise and problems of producing biofuels using different feedstocks and advancements in process technology. The use of biofuels, such as biodiesel, ethanol, bio-oil, syngas, Fischer-Tropsch Hydrogen, and methane (CH4), generated from agricultural crop left-overs, micro- and macroalgae, and other biological waste via thermo-bio-chemical procedures, has been determined to be an environmentally beneficial option for energy production. Developing and implementing biofuels in industry and transportation significantly reduces reliance on petroleum and coal. The literature study indicated that biofuels derived from crops and microalgae have the potential to be the most effective and appealing method. The area of biofuels has made significant advancements via genetic engineering, which has opened up new possibilities for large-scale production for commercial use. However, the process of producing biofuels on a big scale remains difficult. Therefore, it is crucial to address this issue by converting biomass into biofuels using innovative technology to meet present and future energy demands.

CUTTING-EDGE BIOFUEL TECHNOLOGIES FOR ENVIRONMENTAL MANAGEMENT AND SUSTAINABILITY

Researchers focus on finding Renewable Energy Sources (RES) and green energy for a sustainable future owing to ecological sustainability standards, growing power demands, depletion of traditional energy resources, and ecological damage caused by global warming and climate change. Bioenergy is a very viable option as it may be used for various energy needs via appropriate conversion methods. This analysis focuses on the promise and problems of producing biofuels using different feedstocks and advancements in process technology. The use of biofuels, such as biodiesel, ethanol, bio-oil, syngas, Fischer-Tropsch Hydrogen, and methane (CH4), generated from agricultural crop left-overs, micro- and macroalgae, and other biological waste via thermo-bio-chemical procedures, has been determined to be an environmentally beneficial option for energy production. Developing and implementing biofuels in industry and transportation significantly reduces reliance on petroleum and coal. The literature study indicated that biofuels derived from crops and microalgae have the potential to be the most effective and appealing method. The area of biofuels has made significant advancements via genetic engineering, which has opened up new possibilities for large-scale production for commercial use. However, the process of producing biofuels on a big scale remains difficult. Therefore, it is crucial to address this issue by converting biomass into biofuels using innovative technology to meet present and future energy demands.

Integration of a Bismuth-Based Tris-Mononuclear Complex with 2D Functional Materials for Highly Efficient and Durable Aqueous Electrocatalytic Hydrogen Evolution.

The eminence of transitioning from traditional fossil fuel-based energy resources to renewable and sustainable energy sources is most evidently crucial. The potential of hydrogen as an alternative energy source has specifically focuses the electrocatalytic water splitting (EWS) as a promising technique for generating hydrogen. Development of efficient electrocatalysts to facilitate the EWS process while rationalizing the limitations of noble metal catalysts like platinum has become one of the daunting tasks. Consequently, porous functional materials such as metal complexes (MCs) and graphene oxide (GO) can act as potential catalysts for EWS. Therefore, a composite of GO and a mononuclear bismuth metal complex is synthesized through in situ facile synthesis, which is further utilized as an efficient electrocatalyst for the hydrogen evolution reaction (HER). Several potential electrocatalytic MC@GO composite (BMGO-3,5,7) materials were prepared with compositional variation of GO (3, 5, and 7 wt %). The experimental results demonstrate that the BMGO5 composite exhibits excellent HER activity with a low overpotential value of 105 mV at 10 mA cm-2 and a low Tafel slope of 44 mV dec-1 in 1 M KOH solution. Furthermore, a comprehensive investigation on the potentiality of the BMC-GO composite for hydrogen evolution from river water splitting was performed in order to address the issue of freshwater depletion. Inclusion of a mononuclear MC for facile synthesis of functional GO-based efficient electrocatalyst material is very scanty in the literature. This unique approach could assist future research endeavors toward designing efficient electrocatalysts for sustainable renewable energy generation. This is one of the first of its kind, where mononuclear MCs were utilized to develop GO-based functional composite materials for efficient electrocatalysis toward sustainable renewable energy generation.

CuO nanoflowers: Multifaceted implications of various precipitating agents on rectification behaviour

In order to achieve the best possible use of traditional energy resources for the preservation of the environment, semiconductor-based optoelectronic devices are one of the most intriguing methods for converting light energy into electrical energy. CuO has been extensively explored as a material for energy conversion and the development of photo-detectors due to its notable characteristics among other metals, especially its non-toxicity, abundance, high efficiency, electrochemical stability and low cost/promising photodiode. However, some drawbacks limit its practical application in white light and photo-detector, including the rapid recombination rate of photo-generated electron-hole pairs and destitute response to visible light. As a result, several strategies have been developed from an optoelectronics perspective to eradicate these deficiencies and make an effort to enhance CuO photodiode activities. In this research work, the electrical characteristics and rectification behaviour of CuO with various precipitating agents have been examined. The CuO nanoparticles can be synthesized by co-precipitation technique prepared with different precipitants. Through this research, several parameters, such as the structural, functional, morphological, optical and electrical characteristics, were investigated by changing the precipitants. The functional group formation of pure CuO phase was confirmed by FT-IR studies. UV–Vis absorption measurements indicate that the band gap of the CuO nanoparticles was ranging from 2.40 to 2.85 eV. As a diode, CuO/p-Si exhibits a non-ideal behaviour and under light conditions with Na2CO3 precipitant, the better ideality factor is about 2.35. The barrier height is determined by the thermionic emission theory to be 0.77 and 0.79 eV in the dark and light conditions respectively.

Using spatio-temporal graph neural networks to estimate fleet-wide photovoltaic performance degradation patterns.

Accurate estimation of photovoltaic (PV) system performance is crucial for determining its feasibility as a power generation technology and financial asset. PV-based energy solutions offer a viable alternative to traditional energy resources due to their superior Levelized Cost of Energy (LCOE). A significant challenge in assessing the LCOE of PV systems lies in understanding the Performance Loss Rate (PLR) for large fleets of PV systems. Estimating the PLR of PV systems becomes increasingly important in the rapidly growing PV industry. Precise PLR estimation benefits PV users by providing real-time monitoring of PV module performance, while explainable PLR estimation assists PV manufacturers in studying and enhancing the performance of their products. However, traditional PLR estimation methods based on statistical models have notable drawbacks. Firstly, they require user knowledge and decision-making. Secondly, they fail to leverage spatial coherence for fleet-level analysis. Additionally, these methods inherently assume the linearity of degradation, which is not representative of real world degradation. To overcome these challenges, we propose a novel graph deep learning-based decomposition method called the Spatio-Temporal Graph Neural Network for fleet-level PLR estimation (PV-stGNN-PLR). PV-stGNN-PLR decomposes the power timeseries data into aging and fluctuation components, utilizing the aging component to estimate PLR. PV-stGNN-PLR exploits spatial and temporal coherence to derive PLR estimation for all systems in a fleet and imposes flatness and smoothness regularization in loss function to ensure the successful disentanglement between aging and fluctuation. We have evaluated PV-stGNN-PLR on three simulated PV datasets consisting of 100 inverters from 5 sites. Experimental results show that PV-stGNN-PLR obtains a reduction of 33.9% and 35.1% on average in Mean Absolute Percent Error (MAPE) and Euclidean Distance (ED) in PLR degradation pattern estimation compared to the state-of-the-art PLR estimation methods.

Організаційно-економічне забезпечення інтеграції інжинірингу у систему енергетичної безпеки підприємств на підставі процесного підходу

The article highlights the organizational and economic aspects of the introduction of the latest technologies into the energy security system of enterprises, which includes ensuring a stable supply of energy, its rational use and protection from various risks. The main challenges faced by Ukrainian enterprises in the conditions of wartime are considered, including power outages as a follow-up of the destruction of infrastructure. The possibilities of attracting the State support programs and financial mechanisms that can help reduce the economic burden on enterprises are analyzed. In addition, the article emphasizes the importance of a system approach for the faster implementation of technological solutions, which allows for reducing energy costs. It has been researched that enterprises that have used engineering solutions have noted a reduction in energy costs at the level of 25–35%. The introduction of renewable energy sources, such as solar and wind farms, reduces dependence on traditional energy resources and increases resilience to price fluctuations in the energy market. Particular attention is paid to the introduction of the latest technologies, including automation, digitalization, renewable energy sources and smart energy grids (SmartGrids), which contribute to more efficient management of energy resources. These technologies allow to reduce energy costs and ensure the stability of supply. The key elements of organizational and economic support for the integration of engineering into the energy security system are allocated, with an emphasis on automation and digital monitoring of energy consumption in real time. This assists the prompt identification of problems and their quick solution. The use of SmartGrids also helps to optimize the energy distribution process and integrate renewable sources, which increases the flexibility and resilience of enterprises’ energy systems while increasing their cost-effectiveness. The paper also considers methods for assessing the economic efficiency of the integration of modern technologies, including cost-benefit analysis, calculation of return on investment and assessment of risk reduction. It is proved that although the integration of engineering and SmartGrids requires significant capital investment, the long-term benefits, such as reduced energy costs and increased production efficiency, can far outweigh the initial costs. Regular monitoring and evaluation of the results of technology implementation allow timely adjustment of the company’s strategy to achieve the maximum economic effect. The importance of energy security for the stable and efficient operation of enterprises, especially in the conditions of hostilities, which lead to regular interruptions in energy supply and damage to infrastructure, is emphasized. Ensuring energy security contributes to increasing the economic sustainability and efficiency of enterprises in today’s dynamic environment. A comprehensive integration of new technologies into the energy security system through updating organizational and economic approaches is proposed, which will increase the efficiency of energy use, reduce costs and minimize risks. Such integration involves attracting investment, adapting organizational structures and training staff, which will achieve long-term economic efficiency.

Prospects for replacing Russian fuel with Latin American fuel in the European market

The subject of the study is the potential of the Latin American energy market in the context of the demand of the European Union market for the replacement of Russian energy resources. The object of the study is the energy resources market of the European Union, Latin America, and Russia. The purpose of the study is to identify the possibilities of Latin American countries in replacing Russian energy resources in the energy market of the European Union. The author examines in detail such aspects of the topic as the dependence of the EU economy on Russian energy resources, changes in the conjuncture in the fuel and energy sector of the European Union, and also touches on the consequences for European economies in connection with the abandonment of Russian energy resources. Special attention is paid to the opportunities of the Latin American region in the development of the European energy market. The prospects of the Latin American energy market are being explored from the point of view of the availability of natural resources, as well as from the point of view of real opportunities for exporting energy resources. The methodological basis of the research is a systematic and comparative analysis, a method of generalization, methods of grouping and classifying quantitative and qualitative data, methods of analyzing quantitative data. The main conclusions of the study are that in the short and medium term, the role of Latin America in Europe's energy security is small due to geographical remoteness and the lack of technological opportunities for Latin American countries to increase production capacities in the shortest possible time to increase energy production. For this reason, in the near future, the countries of the Latin American region will not be able to significantly replace Russian fuel in the European market of traditional energy resources. However, European companies are interested in the potential of the Latin American region in the field of "green" energy. In the long term, cooperation between the EU and Latin America in this area seems to be the most mutually beneficial for both sides. A special contribution of the author to the research of the topic is the study of the conjuncture of the EU fuel and energy complex in the context of energy imports. The novelty of the research lies in the fact that for the first time in the domestic literature the question of the prospects of the Latin American energy market as a substitute for the Russian energy market for the European one is raised.

A Comprehensive Review of the Applications of Hybrid Evaporative Cooling and Solar Energy Source Systems

Recent advancements in single-stage evaporative cooling (EC) have showcased their effectiveness as an energy-efficient and sustainable air-conditioning (AC) solution. However, several challenges hinder the widespread adoption of EC in various applications. These challenges include climate sensitivity, substantial spatial requirements, and limitations in achieving desired output temperatures. To address these concerns, there has been a growing focus on integrating EC with solar energy (SE) systems. With traditional energy resources being depleted, the use of SE has gained prominence as a sustainable solution to meet future energy demands while mitigating environmental pollution. This paper presents a comprehensive review of hybrid EC–SE systems, aiming to elucidate the potential synergies, benefits, and challenges associated with this integration. The review explores the principles and mathematical approaches of various configurations of EC systems to assess their compatibility with SE sources. Furthermore, the review delves into the mathematical model of SE, encompassing both solar power generation and thermal collectors, with the aim of integrating it into the EC model. It delves into key aspects of energy consumption and performance, showcasing advancements in achieving higher efficiency and enhanced cooling capacity through the hybrid systems. Additionally, the review highlights research gaps in the existing literature, emphasizing the need for further exploration in this interdisciplinary field. In conclusion, this paper offers valuable insights into the potential of EC–SE systems to address energy and cooling requirements while promoting sustainable development.

Modelling and Evaluation of Noise Dispersion from Wind Turbine Operations

Abstract All over the world, the need for energy is increasing, and the methods of obtaining it are harmful to the environment. Traditional energy resources are rapidly depleting. During the extraction and burning of fossil fuels, many different pollutants enter the environment. One of the renewable forms of energy is wind energy. Wind energy is mainly used to generate electricity in wind farms. Wind turbines are a unique source of noise because they are installed at a high height above the ground, and the noise emitted is fluctuating and manifests itself in a wide frequency range. Noise from wind turbines as low as 32 dB(A) is a strong nervous system irritant for some people, while noise of 40 dB(A) and above causes severe discomfort for many people [1]. Detailed noise modeling was carried out in the considered area, assessing how noise affects individual dwellings, noise in the living environment of residential buildings were modeled. The noise level without background noise sources of the nearest residential environment was determined by modeling at 31.9 dB(A) during the night, while the limit value for the protection of human health according to HN 33:2011 is 45 dB(A).

Design optimization of a grid-tied microgrid for a residential community in southern Bangladesh

Abstract Growing energy demand, diminishing fossil fuel reserves and geopolitical tensions are serious concerns for any country’s energy strategy and security. These factors have a greater impact on developing countries, as many of them rely largely on traditional energy resources. Cleaner energy generation is the viable alternative for mitigating these problems, as well as achieving energy independence and tackling climate change. The article discusses planning and design optimization of a residential community microgrid based on multiple renewable resources. In particular, the design and techno-economic assessment of a grid-tied hybrid microgrid for meeting the electricity demand of an alluvial region, Urir Char, located in southern Bangladesh, was addressed. Hybrid Optimization of Multiple Energy Resources is used for the evaluation and it is supplemented by a fuzzy-logic-based load profile design strategy. In addition to the analysis, a predictive load-shifting-based demand management is also introduced. Several cases were considered for the studies and, after considering several criteria, a grid-tied system comprising a photovoltaic array, wind turbine and energy storage system was found to be the best fit for powering the loads. The suggested system reduces the life-cycle cost by 18.3%, the levelized cost of energy by 61.9% and emissions by 77.2% when compared with the grid-only option. Along with the microgrid design, cooking emissions and energy categorization were also discussed.

Trends and Status of Renewable Energy Power Generation in China

Energy is an essential and critical material foundation for economic development, contributing to the rapid growth of the economy and playing an integral role. In today's world, the revolution of energy resources is an imperative task. This is due to the continuous decline in the reserves of traditional energy resources worldwide, such as the urgent need for reserves of fossil energy resources, and the worsening global greenhouse effect and excessive greenhouse gas emissions. Therefore, energy resources need to undergo a restructuring, with the key focus on diversification, efficiency, and cleanliness. Currently, several countries, including China, are either planning or actively developing a low-carbon or even zero-carbon energy system. Furthermore, they are accelerating the revolution of energy consumption and production.China is becoming an essential contributor and guide to the transformation of the world's energy revolution, alongside the realization and improvement of this new energy system.Given this context, the inadequacies in China's ability to support renewable energy are identified by examining China's development objectives. The discussion covers the quantity of renewable power produced, the extent of its consumption and restrictions placed upon it. The present state of renewable energy development in China is viewed through a market-oriented approach. Additionally, the current state and future Development plans of renewable energy generation in China are assessed by considering the legal framework and policy instruments involved.

Deepwater PDC Jetting Bit-Drilling Technology Based on Well Structure Slimming

Growing global energy demand and limited reserves of traditional energy resources are causing a growing energy shortage. In order to meet future energy needs, new energy resources must be continuously explored. Deepwater drilling research has emerged as one of the key ways to address this issue, and well structure slimming is an effective way to increase drilling speed and reduce costs. The hole size of the second section of deepwater wells decreases from a conventional 660.4 mm to 444.5 mm and increases from 500–800 m to 800–1200 m, creating problems where the conventional 660.4 mm cone bit cannot be used, the rate of penetration (ROP) of the cone bit is low, and the service life is short. To solve these problems, a 444.5 mm artificial polycrystalline diamond compact (PDC) was designed for the first time for use at home or abroad, and according to the characteristics and operation requirements of the 914.4 mm conductor jetting process, a unique anti-collision gauge protector was designed, an innovative bypass nozzle was configured, and a hydraulic design to prevent bit balling in shallow soft mudstone was formulated. PDC jetting bit-drilling technology based on well structure slimming was successfully applied to eight deepwater wells in the eastern South China Sea, which successfully jetted a 914 mm conductor and greatly improved the ROP of their second-section holes. When the below-mudline depth of the second-section hole increased by 37.01%, the average ROP increased by 227.84%. These technical achievements have successfully realized deep drilling with seawater, increased speed and efficiency, achieved good application results, and accumulated valuable experiences that can be used for reducing the cost and increasing the efficiency of offshore drilling operations.

Measuring the time-frequency spillover effect among carbon markets and shipping energy markets: A global perspective

Global decarbonization has significantly tightened the link between the shipping industry and the carbon market. Understanding the mechanism of the interdependence between shipping energy and the carbon market is of great importance for carbon pricing and decarbonization of shipping; however, one challenge is that, unlike traditional energy resources, the transmission channels of carbon emissions from shipping energy are built on a global network with distinct geographical heterogeneity. In view of this, we propose a global carbon-shipping market-level framework and scrutinize the intermarket spillover effect in the time and frequency domains. The main findings are as follows: First, the short-term spillover dominates the interaction, where shipping energy markets mainly act as the transmitters and carbon markets mainly play the role of the receivers. Second, the EU carbon market has the largest influence on shipping energy markets, and the spillovers of the marine gas oil and high‑sulfur fuel oil markets on carbon markets are more prominent. Third, the intensity of the spillover effect is negatively correlated with the distance of major events, while the volatility of the spillover effect is the largest in European ports and the smallest in Asian ports. Last, policy-oriented events have the most significant impact on the volatility spillovers between markets, followed by politically oriented events, with market-oriented events having the mildest impact. This study sheds light on the mechanism of the spillovers between the carbon and shipping markets accounting for geographical heterogeneity and provides valuable insights for policymakers to better understand both markets and improve policy efficiency.

ENVIRONMENTAL TAXATION IN THE CONCEPT OF SOCIAL RESPONSIBILITY OF CITIZENS

The article is devoted to the study of the impact of humanity on the natural environment and the justification of the sources of the formation of financial resources for the environmental purposes in the context of social responsibility of citizens. It was established that the existing «consumer» system of human interaction with the natural environment is destructive for the noosphere. It was substantiated that the development of humanity and the consequences of its life activities are a key factor in the growth of negative anthropogenic impact on the environment. It was found that the ecological footprint of a person depends on the level of social well-being and population size. The relationship between the ecological and economic development of the country and its impact on the environment was reflected. The dynamics of expenses of the consolidated budget of Ukraine for the protection of the natural environment were presented. The main reasons and consequences of the change in the «plane» of common interests of man, nature and the economy in the process of human evolution have been established. The volume of emissions of polluting substances into the atmospheric air by households in Ukraine was studied. It was established that the system of environmental payments in Ukraine, in connection with the growing anthropogenic impact on the environment and, accordingly, its inhabitants, needs some optimization. The nature of the environmental tax has been clarified, the history of its emergence and the transformation of the content of this category have been investigated. It was established that the system of environmental taxation in Ukraine is ineffective and needs to be optimized, especially in the context of growing social responsibility of citizens in the conditions of increasing anthropogenic impact on the environment. The proposed changes in taxation of producers of environmentally hazardous products and traditional energy resources, as well as their consumers, were outlined. The structure of environmental tax in the context of social responsibility of citizens was proposed. The allocation of funds for environmental purposes was substantiated with an emphasis on the local budgets. An improved model of human «interaction» with the surrounding natural environment was proposed.