**6. Comparative Study of EES Systems**

The comparative study of different types of EEs systems are depicted in Table 5 [126–129] and Table 6 [130–132]. The efficiency, discharge time, cost, and environmental impacts of EES systems are considered for this study.


**Table 5.** Comparison of EES Systems in terms of efficiency, discharge time and cost [126–129].

**Table 6.** Comparison of EES Systems in terms environmental impact [130–132].


#### **7. Conclusions**

Presently, while the entire world is concerned about the future of the planet in terms of reducing the carbon footprint and making it a greener one, the electricity industry is focusing on more efficient and sustainable power supply, judicious consumption of energy and CO2 reduction. While doing so, main areas of research are identified as anticipated growth of renewable generation, design of renewable technology for better performance, design and implementation of smart grids, integration of RNE into smart grid for better energy demand management by optimization techniques.

The followings are important in the present scenario of the electrical system:


Considering the future and investors' interest, it is obvious that the maximization of system profit and minimization of system generation cost and loss will help in increasing societal benefit. This study examines numerous aspects of renewable integrated deregulated power systems and provides an in-depth appraisal of the most recent research advances in this sector. In this context, this study will be helpful in understanding, analyzing and applying the EES technologies for a better tomorrow.

**Author Contributions:** Conceptualization, M.R.C. and S.D.; methodology, M.R.C., S.D. and J.B.B.; software, M.R.C.; validation, P.K.S. and T.S.U.; formal analysis, S.D.; investigation, M.R.C. and J.B.B.; resources, M.R.C. and S.D.; data curation, P.K.S. and T.S.U.; writing—original draft preparation, M.R.C. and J.B.B.; writing—review and editing, S.D., P.K.S. and T.S.U.; visualization, S.D.; supervision, P.K.S. and T.S.U.; project administration, T.S.U.; funding acquisition, T.S.U. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.

#### **References**

