Zero-MarginalCost Electricity Market Designs ©SHUTTERSTOCK.COM/LISA KOLBASA By Luiz Barroso, Francisco D. Muñoz, Bernardo Bezerra, Hugh Rudnick, and Gabriel Cunha Digital Object Identifier 10.1109/MPE.2020.3033398 Date of current version: 6 January 2021 64 ieee power & energy magazine 1540-7977/21©2021IEEE january/february 2021http://www.SHUTTERSTOCK.COM/LISA