The 13th International Middle-East Power System conference, MEPCON'09, was organized in Assiut University from20-23 December 2009. This was under the auspices of H.E.Dr. Hassan Yunis, minister of electricity and energy; H.E.Dr. Hany Helal, minister of high education and scientific research; Prof. Mustafa Kamal, President of Assiut University and conference president; and Profs. M.K.El-Sherbiny and M.Abdel-Salam, "electrical engineering department", conference chairmen. Prof. Abdel-Salam stated that the conference aim has been to attract the interest of specialist experts in various branches of electrical engineering, investors, and businessmen. The participants of the conference came from 18 countries around the world, and they discussed, in 15 scientific sessions during 3 days, such subjects as Electrical power systems, Power systems' electronics, Power systems' distribution, Power systems' control, Power systems' computer applications, and etc. 130 researches were chosen to be discussed during the conference.