Journal of Energy in Southern Africa最新文献_第3页

Determining the causes of electricity losses and the role of management in curbing them: A case study of City of Tshwane Metropolitan Municipality, South Africa 确定电力损失的原因和管理部门在控制损失方面的作用:以南非茨瓦内市为例研究

4区工程技术

Journal of Energy in Southern Africa Pub Date : 2021-12-13 DOI: 10.17159/2413-3051/2021/v32i4a8704

Bongani Khonjelwayo, Thilivhali Nthakheni

{"title":"Determining the causes of electricity losses and the role of management in curbing them: A case study of City of Tshwane Metropolitan Municipality, South Africa","authors":"Bongani Khonjelwayo, Thilivhali Nthakheni","doi":"10.17159/2413-3051/2021/v32i4a8704","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i4a8704","url":null,"abstract":"The problem of energy losses, both nationally and internationally, is a leading cause for the financial collapse of most utilities. A quantitative research approach was adopted for this study where a questionnaire was used to collect information from the participants. A total of 113 City of Tshwane (CoT) employees within the electricity division participated in the study. Descriptive statistics and inferential statistical methods were used to analyse the outcome of the survey. The study found that technical and non-technical losses are the major cause of revenue loss. Non-technical losses are caused either by inefficiencies in managing losses or by end-users being unwilling to pay for electricity. The study found that power theft through meter tampering, incorrect billing by employees, and cable theft were also major causes of energy losses. Illegal connections were found to be the major cause of energy losses, along with power theft and lack of resources. Deficiencies in infrastructure maintenance were found to be the main cause of technical losses. The study found that management of CoT is committed to managing energy losses, being aware of their impact on the financial well-being of the municipality. There is an established policy of managing energy losses and there is a plan to replace ageing infrastructure. Employees are continuously trained in accurate billing and metering as part of efforts to curb energy losses. The municipality is also engaged in efforts to put educational programmes in place to inform communities about electricity theft.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82189050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Electric energy planning in Namibe, Angola: Inserting renewable energies in search of a sustainable energy mix 安哥拉纳米贝的电力能源规划:利用可再生能源寻求可持续的能源结构

4区工程技术

Journal of Energy in Southern Africa Pub Date : 2021-12-13 DOI: 10.17159/2413-3051/2021/v32i4a9430

I. Lemba, M. Ferreira Dias, M. Robaina

{"title":"Electric energy planning in Namibe, Angola: Inserting renewable energies in search of a sustainable energy mix","authors":"I. Lemba, M. Ferreira Dias, M. Robaina","doi":"10.17159/2413-3051/2021/v32i4a9430","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i4a9430","url":null,"abstract":"The socioeconomic development of any region requires electricity for operating the various sectors of the economy. Sometimes energy is scarce, not only because of the lack of energy resources, but also because energy policy is inadequate or non-existent. This paper examines the situation in the province of Namibe, Angola, characterising the energy sector, and proposing an energy mix for the security of electricity supply, environmental protection and sustainable economic development. Using the Long-range Energy Alternative and Planning System, energy scenarios were simulated and the greenhouse gas emissions (GHGs) for the period 2014-2040 calculated and analysed. The most sustainable scenario, in terms of energy mix diversification and GHG reduction, as well as the least costly (considering electricity production and carbon costs), has an increase of hydro capacity and the insertion of wind, solar photovoltaic, thermoelectric sources and natural gas. Given the intermittency of photovoltaic and wind systems, natural gas appears in this scenario as a way to avoid interruptions in the electricity supply. This scenario is the one with the largest production reserve margin of 24.47 %, and emissions are avoided at 386 550 tCO2eq compared to the base scenario in 2040. Energy policymakers can take this scenario as a model to assist in making decisions on how power capacities can be installed over the planned time for the desired energy output.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84515561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

International procurement policies influencing renewable energy siting – implications for South Africa 影响可再生能源选址的国际采购政策——对南非的启示

4区工程技术

Journal of Energy in Southern Africa Pub Date : 2021-12-13 DOI: 10.17159/2413-3051/2021/v32i4a8397

Thabang B. M. Mosaka, Ndamulelo Mararakanye, B. Bekker

{"title":"International procurement policies influencing renewable energy siting – implications for South Africa","authors":"Thabang B. M. Mosaka, Ndamulelo Mararakanye, B. Bekker","doi":"10.17159/2413-3051/2021/v32i4a8397","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i4a8397","url":null,"abstract":"The South African Renewable Independent Power Producer Procurement Programme selects bid winners based on bid tariff (70% weighting) and various economic development criteria (30% weighting). Locating renewable energy (RE) projects in areas with better resources increases their cost competitiveness. As a result, most successful bids for wind and solar photovoltaic (PV) systems to date have been concentrated in the Eastern Cape and Northern Cape provinces, respectively. Studies have shown that a wider geographic distribution of wind and solar PV projects mitigates the impacts of the variability of wind and solar PV resources, eases grid congestion and generally improves the power system’s operation. This paper conducts a literature review to investigate the procurement methods used in different regions of the world to influence the placement of RE plants, the results of which then inform proposals on adjustments to the current REI4P. The study finds that, after congestion incidents due to concentration of RE plants, some regions implement location-based tariff, where high-resource areas receive the lowest tariff and vice versa. Other regions prioritise on building transmission infrastructure in high-resource areas, while others limit the size of RE installations in one area. Given the current generation and transmission constraints in South Africa, it is important to encourage geographical dispersion of RE plants and avoid RE curtailment, since this can escalate the cost of RE integration significantly.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79077643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective selection of countries in sub-Saharan Africa for new market entry by independent wind power producers 有效选择撒哈拉以南非洲国家，让独立风力发电商进入新的市场

4区工程技术

Journal of Energy in Southern Africa Pub Date : 2021-12-13 DOI: 10.17159/2413-3051/2021/v32i4a10673

Carsten Lausberg, K. Evans, Enelge De Jongh

{"title":"Effective selection of countries in sub-Saharan Africa for new market entry by independent wind power producers","authors":"Carsten Lausberg, K. Evans, Enelge De Jongh","doi":"10.17159/2413-3051/2021/v32i4a10673","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i4a10673","url":null,"abstract":"When independent power producers (IPPs) assess new market entry opportunities, subjective decision making can result in an unfavourable outcome. Multi-criteria decision analyses (MCDA) objectify the decision process and help to achieve better results. The aim of this study is to determine and rank the most important criteria for market entry and then determine which selected countries in sub-Saharan Africa are most favourable for wind IPPs. A combination of MCDA methods was used to rank seven countries. Nineteen criteria, identified in the literature reviewed, were included in the analyses. In the first phase of the study an industry expert survey was conducted and the analytical hierarchy process (AHP) was used to rank the criteria in order of importance. In the second phase, a preference ranking organization method for enrichment evaluation (PROMETHEE) was employed to rank the countries from most to least favourable for IPP market entry. The expert survey and AHP showed that political and economic criteria are more important than technical and social criteria. The PROMETHEE model ranked South Africa followed by Ethiopia as the most favourable markets for wind IPPs to enter. These countries have strong natural wind resources but only South Africa offers incentives specifically for on-grid renewable energy. The methods used in this study are not restricted to the wind industry and can be expanded to different technologies and industries to assist with decision making.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82272601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving reliability of the power distribution system in Goma (DRC) using solar distributed generation 利用太阳能分布式发电提高戈马(刚果民主共和国)配电系统的可靠性

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Journal of Energy in Southern Africa Pub Date : 2021-12-13 DOI: 10.17159/2413-3051/2021/v32i4a11207

G. Sengi, E. Ntagwirumugara

{"title":"Improving reliability of the power distribution system in Goma (DRC) using solar distributed generation","authors":"G. Sengi, E. Ntagwirumugara","doi":"10.17159/2413-3051/2021/v32i4a11207","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i4a11207","url":null,"abstract":"The existing power distribution system of the city of Goma in the Democratic Republic of the Congo has many problems, including the scarcity of electric energy, power unreliability, the low access rate of electrification, poor flexibility in the network topology, and lack of demand response, which lead to shedding of load, unbalancing and overloading the system. The reliability of the Goma power distribution system is very poor by international standards. The major cause of this is the lack of adequate energy supply to meet demand. To mitigate the power reliability problem, a solar-based distributed generation (DG) is modelled and evaluated in this study. Each feeder has been considered separately with an appropriately designed DG. The work has evaluated initial investment cost and life cycle cost of the investment to assess the feasibility of the proposed solution. Based on the unserved energy and electricity tariff, an economic analysis was conducted. The reliability indices are computed and the modelled solution is designed for each feeder in PV syst software and simulated using ETAP, whose simulation results show that the reliability can be improved by up to 76%. \u0000 ","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80907837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Design and development of a low-cost system to convert solar thermal energy into electricity for households in South Africa using solar concentrators 设计和开发一种低成本系统，利用太阳能聚光器将太阳能转化为电能，供南非家庭使用

4区工程技术

Journal of Energy in Southern Africa Pub Date : 2021-12-13 DOI: 10.17159/2413-3051/2021/v32i4a10661

L. Snyman, Glen Maeko

{"title":"Design and development of a low-cost system to convert solar thermal energy into electricity for households in South Africa using solar concentrators","authors":"L. Snyman, Glen Maeko","doi":"10.17159/2413-3051/2021/v32i4a10661","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i4a10661","url":null,"abstract":"South Africa is, due its specific latitude location in the southern hemisphere, exposed to high solar irradiation levels. Black thermal absorbers have a high absorbance for solar incident radiation, while commercial photovoltaic technology only converts about 10% of energy available in the solar spectrum. In this article, low-cost Peltier conversion cells, that are normally used for cooling purposes, and that are freely available in supply stores in South Africa, were identified as suitable conversion cells for converting thermal energy into electricity. Two prototypes of thermal-to-electricity energy conversion systems were subsequently designed and developed. Particularly, advanced pulse mode DC- to- DC conversion technology, a special electronic control system, was developed, that could extract high amounts of electrical energy from the cells and could store the energy in standard storage batteries. A 3 W and a 30 W output continuous conversion capacity system were developed. A power conversion of up to 2 W capacity per individual cell was achieved. The systems used no movable parts, and the lifespan of the systems is projected to be at least twenty years. Cost and viability analyses of the systems were performed and the results were compared to existing solar photovoltaic energy conversion systems. Combining the 30 W capacity system with a black body and reflector plate absorber system revealed a cost structure of only ZAR 0.8 per kWh, as compared with a derived ZAR 3 per kWh for a combined photovoltaic and solar geyser combination, as calculated for a ten-year term. The technology as developed is suitable to be incorporated in South African households and rural Africa applications.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83984421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Outlook for the biomass energy sector in Mozambique: Policies and their challenges 莫桑比克生物质能部门的前景:政策及其挑战

4区工程技术

Journal of Energy in Southern Africa Pub Date : 2021-12-13 DOI: 10.17159/2413-3051/2021/v32i4a11936

Jonas Massuque, C. Matavel, P. F. Trugilho

{"title":"Outlook for the biomass energy sector in Mozambique: Policies and their challenges","authors":"Jonas Massuque, C. Matavel, P. F. Trugilho","doi":"10.17159/2413-3051/2021/v32i4a11936","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i4a11936","url":null,"abstract":"To overcome the negative impacts of unsustainable exploitation of forest resources, the Mozambican government has been trying to regulate the supply and demand of biomass, the main source of energy for the majority of the population. This paper reviews policies implemented in Mozambique aimed at increasing domestic energy production while promoting a sustainable use of biomass. Despite the efforts to reduce the level of biomass energy use, it remains the most attractive to local populations and, therefore, still has great importance in the national energy mix. Thus, rather than looking at woodfuels as an environmental problem, regulations should also recognise the dependence of local communities on these resources. Firewood remains the main energy source in rural areas, and approximately 0.36% of the forest in Mozambique is lost every year. The replacement of firewood and charcoal by other renewable sources of energy is still far from reality. Charcoal production continues to be carried out in traditional low-yield ovens and the levels of forest degradation are still alarming. As such, improvements to the existing regulation framework are still needed.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"30 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72490256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Development of low-cost reflective plate thermal energy absorber systems for application in South Africa 在南非应用的低成本反射板热能吸收系统的开发

4区工程技术

Journal of Energy in Southern Africa Pub Date : 2021-09-19 DOI: 10.17159/2413-3051/2021/v32i3a8044

Fanos Mutizhongo, L. Snyman, Kevin Jalet

{"title":"Development of low-cost reflective plate thermal energy absorber systems for application in South Africa","authors":"Fanos Mutizhongo, L. Snyman, Kevin Jalet","doi":"10.17159/2413-3051/2021/v32i3a8044","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i3a8044","url":null,"abstract":"An innovative solar heat collector system was developed from low-cost materials by applying innovative design technology and using adaptive technologies. The system design entails placing long black polymer pipes connected in series circulation, mounted and positioned in grooves of inverted box rib galvanised steel plating. The grooves reflect and focus the incident rays on the centre piping, concentrating incident sun rays on the black piping and increasing the absorption of thermal energy in the piping filled with circulating water. The circulation of the water is facilitated by a direct-current solar-driven pump powered by a small photovoltaic panel. The thermal energy as collected is stored in a standard household geyser tank. A 3 × 4 m heat absorber of this type collects approximately 10 kWh of energy per day. The estimated cost of the system, considering the capital outlay over an expected ten-year life cycle for the product was estimated at R0.25 per kWh. This pricing competes extremely favourably with the general cost of grid electricity in South Africa for medium-sized households, which is of the order of R2 per kWh up to 1000 kWh per month, including taxes. With an estimated electricity cost escalation of above 5% every year, the ten-year saving for a household using this prototype can be approximately R200 000. The technology and designs developed through the study can create many new business opportunities in South Africa in both urban and rural environments, through manufacturing, installing, repairing, and maintaining the systems.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84665212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

moderating and mediating role of local government in the community engagement strategy of a renewable energy company in South Africa 地方政府在南非一家可再生能源公司社区参与战略中的调节和中介作用

4区工程技术

Journal of Energy in Southern Africa Pub Date : 2021-09-19 DOI: 10.17159/2413-3051/2021/v32i3a9403

Bryant Robinson, Siân Stephens

引用次数: 0

A cost-benefit analysis of implementing a 54 MW solar PV plant in a South African platinum mining company: A case study 在南非铂矿公司实施54兆瓦太阳能光伏电站的成本效益分析:案例研究

4区工程技术

Journal of Energy in Southern Africa Pub Date : 2021-09-19 DOI: 10.17159/2413-3051/2021/v32i3a11604

Sam Barnard, A. Smit, S. Middelberg, M. J. Botha

{"title":"A cost-benefit analysis of implementing a 54 MW solar PV plant in a South African platinum mining company: A case study","authors":"Sam Barnard, A. Smit, S. Middelberg, M. J. Botha","doi":"10.17159/2413-3051/2021/v32i3a11604","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i3a11604","url":null,"abstract":"A reliable and secure supply of energy is a prerequisite for adequate output and economic growth – especially in a platinum mining company. With exponential tariff increases, inadequate power supply leading to power cuts, and a carbon tax introduction, this study compared the costs with benefits by implementing a 54 MW solar photovoltaic (PV) plant. Two scenarios were compared over the same 20-year period in a case study of a South African platinum mining company operating in the platinum belt of Rustenburg. The first scenario was grounded upon the decision to proceed with the conventional manner of sourcing electricity from Eskom, South Africa’s power utility. The second scenario assessed the implementation of a 54 MW solar PV plant. The findings reveal that the company could generate 2 439 753 MWh of clean energy over 20 years with an investment of ZAR 910 857 920, giving a ZAR 563 205 994 (11%) carbon tax saving and a ZAR 5 614 426 335 (10%) reduction in electricity costs. Further, installing the solar PV plant could reinforce the company‘s dedication to protecting the environment and creating job opportunities through the employment of staff to install and maintain the plant.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88718526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1