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Economic investigation of repowering of the existing wind farms with hybrid wind and solar power plants: a case study

International Journal of Energy and Environmental Engineering volume 12, pages 855–871 (2021)Cite this article

Abstract

In Tamil Nadu, India, the old wind turbines installed in 1988 have to be repowered and replaced by modern/advanced technological wind turbines. A solar power plant can be set up using the vast area between the wind turbines on the farm. The economic evaluation must be carried out to determine whether this hybrid project is economically beneficial. This article aims to examine the financial viability of repowering old wind turbines with solar power plants’ inclusion. According to the initial investment costs specified within fixed areas and the distance between turbines, the issue is articulated as optimizing the net present value (NPV) of the project. In this study, the economic investigation on the wind farm located in Kayathar was explored by replacing 30 numbers of 200 kW old wind turbines with modern wind turbines of 2000–3000 kW and installing the solar power plant between wind turbines, excluding the shadow region of wind turbines. The HOMER Pro software and Excel spreadsheet were used to analyze the optimal allocation, economic, electricity production, and sensitivity analyses of the effective hybrid systems. The value of electricity prices was measured using the levelized cost of energy and NPV methods. Additionally, a sensitivity analysis of the chosen parameters for the internal rate of return and debt service coverage ratio was estimated for wind and solar hybridization. The economic analysis suggests satisfactory profitability for the project, even without depending on subsidies. Furthermore, sensitivity analysis helps one see the consequences of the risk on the life of the wind farm and its impact on the project’s productivity and performance.

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The authors confirm that the data supporting the findings of this study are available within the article. “As per the data policy and guidelines, data provided to parties would be for their exclusive use only, and under no circumstances, these data reproduced/transferred to other agencies either electronically or in physical form.”

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Acknowledgements

The researchers would very much like to thank to Dr. S. Gomathinayagam, former Director General, A. ShobanaDevi, Project Engineer NIWE, and officials of the NIWE and Dr. Reddy Prasad D.M., Universiti Teknologi Brunei, Brunei for their valuable contribution to this research work.

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Authors and Affiliations

  1. The Gandhigram Rural Institute - Deemed University, Dindigul, India

    K. Boopathi, S. Ramaswamy & V. Kirubakaran

  2. ITCOT Consultancy and Services Limited , Chennai, India

    G. Saravanan & S. Thyagaraj

  3. National Institute of Wind Energy, Chennai, India

    K. Uma & K. Balaraman

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  1. K. Boopathi
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  2. S. Ramaswamy
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Correspondence to K. Boopathi.

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Boopathi, K., Ramaswamy, S., Kirubakaran, V. et al. Economic investigation of repowering of the existing wind farms with hybrid wind and solar power plants: a case study. Int J Energy Environ Eng 12, 855–871 (2021). https://doi.org/10.1007/s40095-021-00391-3

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  • DOI: https://doi.org/10.1007/s40095-021-00391-3

Keywords

  • Wind turbine generator
  • Repowering
  • Annual energy production
  • Net present value
  • Solar power plant
  • Levelized cost of energy