Natalia Ortega

Bio: Natalia Ortega is an academic researcher. The author has co-authored 1 publications.

Techno-Economic Feasibility of Off-Grid Renewable Energy Electrification Schemes: A Case Study of an Informal Settlement in Namibia

Abstract: This paper examines different off-grid renewable energy-based electrification schemes for an informal settlement in Windhoek, Namibia. It presents a techno-economic comparison between the deployment of solar home systems to each residence and the supplying power from either a centralized roof-mounted or ground-mounted hybrid microgrid. The objective is to find a feasible energy system that satisfies technical and user constraints at a minimum levelized cost of energy (LCOE) and net present cost (NPC). Sensitivity analyses are performed on the ground-mounted microgrid to evaluate the impact of varying diesel fuel price, load demand, and solar photovoltaic module cost on system costs. HOMER Pro software is used for system sizing and optimization. The results show that a hybrid system comprising a solar photovoltaic, a diesel generator, and batteries offers the lowest NPC and LCOE for both electrification schemes. The LCOE for the smallest residential load of 1.7 kWh/day and the largest microgrid load of 5.5 MWh/day is USD 0.443/kWh and USD 0.380/kWh, respectively. Respective NPCs are USD 4738 and USD 90.8 million. A sensitivity analysis reveals that variation in the fuel price and load demand changes linearly with system costs and capacities. However, reducing the PV module price in an energy system that includes wind and diesel power sources does not offer significant benefits. Furthermore, deploying an energy system that relies on fossil fuels to each residence in an informal settlement is not environmentally responsible. Unintended negative environmental impacts may result from the mass and simultaneous use of diesel generators. Therefore, a microgrid is recommended for its ability to control the dispatch of diesel generation, and its scalability, reliability of supply, and property security. A roof-mounted microgrid can be considered for piloting due to its lower initial investment. The electricity tariff also needs to be subsidized to make it affordable to end-users. Equally, government and community involvement should be prioritized to achieve long-term economic sustainability of the microgrid.

Policy Pathways for Mapping Clean Energy Access for Cooking in the Global South—A Case for Rural Communities

Abstract: Currently, over 1.5 billion people, especially in the Global South, live without access to modern energy for household uses, especially for cooking. Therefore, this study examines the cooking space of the Global South with a specific focus on the rural communities to map alternative energy sources, technologies and supporting policies to drive clean cooking services for improved socioeconomic development. It begins with a literature review on clean cooking technologies and clean energy access for the Global South, which leads to the suggestion of clean cooking policies by mapping technology, affordability, accessibility, climate action, business model and local capacity. In order to ensure that the validation is appropriate, three online questionnaires were designed to capture three categories of key stakeholders with distinctive and complementary interests in clean energy access for cooking: (i) End-users, (ii) Energy Suppliers and (iii) Interest Groups in rural communities in Fiji, Ghana and Nigeria. The responses are analysed to conduct a comparative study across the three countries examined. Based on the above, an attempt is made to present broad base policy pathways for adopting clean cooking services in the rural community for sustainable development. The policy pathways harmonize the major stakeholders in the cooking space: Governments, Non-Governmental Organizations (NGOs), clean energy developers, business services and the end-users. In addition, a business model in the context of a rural community cooking space is proposed, stating that the initial life of the clean cooking business should be government-driven and, thereafter, followed by incentive-driven at the mid-life of the business (say, 25% technology penetration) and private-sector-driven at the late-life (say, 45% technology penetration). It is expected that the effort made in this work could be advanced by investigating the detailed techno-economic parameters of clean cooking technologies that could be influenced by the policy pathways established in connection with the sociocultural factors associated with energy services.