Comparative Analysis of Rankine Cycle Linear Fresnel Reflector and Solar Tower Plant Technologies: Techno-Economic Analysis for Ethiopia

Salah Kamel,Tomiwa Sunday Adebayo,Bright Akwasi Gyamfi,Ephraim Bonah Agyekum,Ibrahim B M Taha,Salam J Yaqoob

doi:10.3390/su14031677

Abstract

The need to meet the world’s growing demand for energy in an environmentally sustainable manner has led to the exploration of various renewable energy (RE) resources for power generation. The objective of this study is to examine the techno-economic potential of concentrated solar power plants (i.e., linear Fresnel reflector (LFR) and central receiver system (CRS) for electricity generation in Eastern African countries with a case study on Ethiopia. The study was conducted using the System Advisor Model (SAM). In order to estimate the economics of the two power plants, the Levelized cost of energy (LCOE) and the net present value (NPV) metrics were used. According to results obtained from the simulations, the LFR produced annual energy of 528 TWh at a capacity factor (CF) of 60.3%. The CRS also produced a total of 540 TWh at a CF of 61.9%. The LCOE (real) for the CRS is found to be 9.44 cent/kWh against 10.35 cent/kWh for the LFR. The NPV for both technologies is found to be positive for inflation rates of 2% and below. An inflation rate above 2% renders the two power plants financially impracticable. A real discount rate above 9% also renders both projects economically unviable. Based on the obtained results, the CRS system is identified as the best technology for electricity generation under the Jijiga climatic condition in Ethiopia.

Highlights

The central receiver system (CRS) recorded the least real Levelized cost of energy (LCOE). Both two systems will not be economically viable under the current financial assumptions for the study; this is because of the negative net present value (NPV) recorded by both technologies
Means that electricity generation from both Concentrating solar power (CSP) technologies will be much expensive in the Ethiopian electricity market for consumers, but both technologies will be relatively cheaper in the global context
Data from the figure suggests that uncertainties in the heliostat and solar field cost significantly affect the LCOE

Summary

Introduction

Expanding access to clean and affordable energy remains one of the key policies of governments around the globe, those from emerging economies [1]. Renewable energy (RE) development worldwide has seen enormous growth in recent periods due to the negative impact of fossil fuel-generated energy on the environment [2,3]. More RE capacity was added globally in 2015, surpassing fossil fuel sources for the first time. The development of RE in developing countries surpassed that of advanced countries during that same period [4]

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Conclusion