J. Renewable Sustainable Energy 11, 046301 (2019); https://doi.org/10.1063/1.5113902 11, 046301 © 2019 Author(s). CONOPT solver embedded in GAMS for optimal power flow Cite as: J. Renewable Sustainable Energy 11, 046301 (2019); https://doi.org/10.1063/1.5113902 Submitted: 09 June 2019 . Accepted: 05 August 2019 . Published Online: 22 August 2019 Martin P. Ćalasan , Lazar Nikitović , and Saša Mujović