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This is to certify that your paper entitled «Impact of Hub Height, Rotor Diameter, and Terrain Roughness on Wind Energy Yield in Central Iraq: A Controlled Three-Factor Analysis» was indexed with 10 pages, in the CIVILICA citation database, code COI:JR_JREE-13-4_004, after evaluation and approval of the referees of the "Journal of Renewable Energy and Environment Vol 13, Issue 4 , Year 2026.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above journal and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.