_Applied_  
_sciences_  
_Article_  
**Solar Potential in Saudi Arabia for Inclined Flat-Plate Surfaces of Constant Tilt Tracking the Sun**  
**[PERSON] 1, [PERSON] 2,*(c), [PERSON] 3,4(c) and [PERSON] 5**  
1 Department of Physics, College of General Studies, King Fahd University of Petroleum and Minerals, Dhabran SA-31261, Saudi Arabia; [EMAIL_ADDRESS]  
2 Atmospheric Research Team, Institute of Environmental Research and Sustainable Development, National Observatory of Athens, GR-11810 Athens, Greece  
3 Centre of Excellence for Climate Change Research, Department of Meteorology, King Abdulaziz University, P.O. Box 80208, Jeddah SA-21589, Saudi Arabia; [EMAIL_ADDRESS]  
4 Climate Research Unit, School of Environmental Sciences, University of East Anglia, Norwich NR4 7 JI, UK  
5 Health, Safety, Security and Environment Excellence Section, Industrial Security and Responsible Care Department, Sahara International Petrochemical Company, SIPCHEM,  
Jubail Industrial City 31961, Saudi Arabia; [EMAIL_ADDRESS]  
* Correspondence: [EMAIL_ADDRESS]  
**Clitution:** [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON] Solar Potential in Saudi Arabia for Inclined Flat-Plate Surfaces of Constant Tilt Tracking the Sun. _Appl. Sci._**2021**_11_, 7105. [[https://doi.org/10.3390/app11157105](https://doi.org/10.3390/app11157105)]([https://doi.org/10.3390/app11157105](https://doi.org/10.3390/app11157105))  
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**Copyright**C 2021 by the authors. Licence MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ([[https://creativecommons.org/licenses/by/4.0/](https://creativecommons.org/licenses/by/4.0/)]([https://creativecommons.org/licenses/by/4.0/](https://creativecommons.org/licenses/by/4.0/))).  
**Abstract:** The objective of the present work is to investigate the optimally performing tilt angles in Saudi Arabia of solar panels that follow the daily motion of the Sun. To that end, the annual energy sums are estimated for surfaces with tilt angles in the range 5\({}^{\circ}\)-55\({}^{\circ}\) at 82 locations covering all Saudi Arabia. All calculations use a surface albedo of 0.2 and a near-real value, too. It is found that tilt angles of 40\({}^{\circ}\), 45\({}^{\circ}\), and 50\({}^{\circ}\), respectively, are optimal for the three recently defined solar energy zones in Saudi Arabia. The variation of the energy sums in each energy zone on annual, seasonal and monthly basis is given for near-real ground albedos; the analysis provides regression equations for the energy sums as functions of time. A map of the annual global inclined solar energy for Saudi Arabia is derived and presented. The annual energy sums are found to vary between 2159 kWhm\({}^{-2}\)year\({}^{-1}\) and 4078 kWhm\({}^{-2}\)year\({}^{-1}\). Finally, a correction factor, introduced in a recent publication, is used; it is confirmed that the relationship between the correction factor and either the tilt angle or the ground-albedo ratio has a general application and it may constitute a nomogram.  
**Keywords:** solar potential; maximum energy; inclined surfaces; solar tracking; Saudi Arabia