## 6 Conclusions  
The increased use of renewable energy systems worldwide during recent decades caused saturation in Jordan electrical grid. The primary cause of this saturation is the intermittent nature of the electrical power produced by these technologies and the subsequent stability issues that the grid operators are faced with. Design, modeling, analysis, and feasibility study of a hybrid wind and water-pumping storage system was performed in this paper. The system was designed and analyzed for King Talal Dam which is in Northern Jordan. The importance of this study is that it is directed mainly to Jordan and the MENA region in general. The Jordanian renewable energy market is a promising arena that encourages developers, investors, engineers and companies to develop and install pure renewable energy systems and renewable energy hybrid projects for the generation of electricity. King Talal Dam \begin{table}
\begin{tabular}{c c c} \hline \hline
**Parameter** & **Value** & **Value** \\ \hline Discount Rate & 3\% & 6\% \\ Payback Period & 10.26 Years & 8.59 Years \\ NPV & 13,207,457 JD & 9,644,455 JD \\ IRR & 9.42\% & 9.79\% \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Financial analysis for KTD’s hybrid system. Figure 17: Cash flow diagram for KTD’s hybrid system. power plant is considered of high rated output power relative to Jordan's power generation plants. It is also considered to have a good level of sustainability due to its significant water level throughout the whole year. For the project design proposed in this study, water pumped-hydro storage was capable of adjusting the demand supply to balance and consequently reduce the gap between peak and off-peak periods, and play an important role of levelling other power generation plants and stabilizing of the power grid. First, the project allowed an increase in the penetration capacity of renewable energy projects in the grid by providing voltage and frequency stability to support the intermittent nature of such project. During times of low electricity demand, such as at night or on weekends, the excess energy produced by the wind farm is used to pump water to an upper reservoir; the turbine acts as pump moving water back uphill. During periods of high electricity demand, the stored water is released through turbines. This type of support with the stabilizing features also prevents system blackout during peak demand. Additionally, the pumped-hydro storage portion of the project can be implemented on its own at King Talal Dam, and even replicated in other local dams for the support and stability of the national grid. Advantages of the project lie in the current restrictions for NEPCO to shut down commercial renewable energy projects that are currently running to maintain the wellbeing of the electric grid. During the forced shut-down period, NEPCO compensates investors for their energy losses, which can be costly. Alternatively, investing in such systems enables renewable energy projects to work all the time without the need to shut down. Finally, the two-way turbine technology can be used by NEPCO as hydroelectric generation when instant additional energy is in demand. The Voltage and Frequency of NEPCO grid must be kept stable, particularly through the hours of peak load. Pumped-storage plants are used for grid stabilization and to provide grid services such as frequency shifting and voltage stabilization, therefore, this study analyzes the proposed this problem and suggests a pumped-storage system as a solution. The total used water for irrigation is approximately 400,000 m\({}^{3}\) per day except one day per week, based on this study. It was assumed that the unused water for the above day was collected in the lower tank with total capacity more than 1,200,000 m\({}^{3}\). The lower tank, filled within three weeks for the first time and this amount is used in the calculation for this project. The proposed pumped-storage system will have two pumps/turbines.