[1] T. Ma, H. Yang, L. Lu, J. Peng, Optimal design of an autonomous solar–wind-pumped storage power supply system, Applied Energy, Vol. 160, pp. 728-736, 2015.
[2] E. Pujades, P. Orban, A. Jurado, C. Ayora, S. Brouyère, A. Dassargues, Water chemical evolution in Underground Pumped Storage Hydropower plants and induced consequences, Energy Procedia, Vol. 125, pp. 504-510, 2017.
[5] D. Hales, Renewables 2018 Global Status Report, Renewable Energy Policy Network, Paris: REN21 Secretariat, pp. 1-325, 2018.
[6] LD. Roper, Future world energy, Accessed 28 August 2019; http://www.roperld.com/science/energyfuture. htm, 2012.
[8] S.A. Ilupeju, Design, modelling and optimisation of an isolated small hydropower plant using pumped storage hydropower and control techniques. PhD Thesis, University of KwaZulu-Natal, Durban, 2015.
[10] Historical Timeline-History of Alternative Energy and Fossil Fuels, Accessed July 24 2019; http://alternativeenergy.procon.org/view.timeline.php?timelineID=000015, 2013.
[11] M. L. Parry, O.F. Canziani, J. P. Palutikof, P. J. Van Der Linden, C. E. Hanson, climate change 2007: impacts, adaptation and vulnerability: Contribution of working group II to the fourth assessment report of the intergovernmental panel on climate change, Vol. 4, pp.1-13, Cambridge Uni-versity Press, Cambridge, UK, 2007.
[12] S. Kharel, B. Shabani, Hydrogen as a long-term large-scale energy storage solution to support renewables Energies, Energies, Vol. 11, No.10, pp. 1-17, 2018.
[13] F. I. Petrescu, R. V. Petrescu, Hydropower and Pumped-Storage, Accessed July 24 2019; http://www.altenergymag.com/article/2015/11/hydropower-and-pumped-storage/22104/, 2015.
[14] Pumped Hydro Storage, Accessed July 24 2019; http://www.alternative-energy-tutorials.com/energy-articles/pumped-hydro-storage.html, 2016.
[15] A. Habib, L. Ling, B. Abbas, Demand and Application of Energy Storage Technology in Renewable Energy Power System, American Scientific Research Journal for Engineering, Technology, and Sciences, Vol. 36, No. 1, pp. 25-36, 2017.
[16] B. Decourt, R. Debarre, Electricity storage Factbook, first Edition, pp. 22-29, Paris: Schlumberger Business Consulting Energy Institute, 2013.
[17] Salt Water Battery, Accessed 24 July 2019; https://en.wikipedia.org/wiki/Salt_water_battery.
[18] S. Park, B. SenthilKumar, K. Kim, S. M. Hwang, Y. Kim, Saltwater as the energy source for low-cost, safe rechargeable batteries, Journal of Materials Chemistry A, Vol. 4, No. 19, pp. 7207-7213, 2016.
[19] Aib Saltwater battery- Aqueous Ion Exchange Battery, Accessed 24 July 2019; https://www.bluesky-energy.eu/en/.
[20] Saltwater batteries on the threshold of ecologically safe energy storage, Accessed 24 July 2019; http://enerparc.in/blog/, 2018.
[21] A. A. Adeyanju, Thermal Energy Storage Techniques, Sci-Afric Journal of Scientific Issues, Research and Essays, Vol. 3, No. 5, pp. 726-736, 2015.
[23] P. Yang, X. Hu, G. Liao, Dynamic Characteristics of the Steam Accumulator Charging and Discharging, inMATEC Web of Conferences (GCMM 2016), Les Ulis: EDP Sciences, pp. 1-8, 2017.
[24] A. Saljnikov, D. Goričanec, Đ. Kozić, J. Krope, R. Stipić, Borehole and Aquifer Thermal Energy Storage and Choice of Тhermal Response Test Method, InProceedings of the 4th WSEAS International Conference on Heat Transfer, Thermal Engineering and Environment, Elounda, Greece, pp. 11-15, 2006.
[25] 4 new ways to store renewable energy with water, Accessed 24 July 2019: https://spectrum.ieee.org/energy/renewables/. 2017.