Mary Beth Mandanas

Mary Beth Mandanas serves as the Chief Executive Officer of Onyx Renewable Partners L.P. since January 2022 and as an Independent Director at Energy Vault since February 2022. Previously, Mandanas held the position of Independent Director at TortoiseEcofin Acquisition Corp III from July 2021 to July 2023 and worked as a Chief Investment Officer - Consultant at Sol Systems in 2020-2021. Mandanas was the Executive Vice President and Chief Strategy Officer at CleanChoice Energy from 2015 to 2020 and served as Managing Director and Head of Power/Utilities in Corporate Banking at RBC Capital Markets from 2013 to 2015, overseeing a substantial portfolio in the power and utility sector. Additional experience includes a role as Managing Director in Power and Utilities Corporate and Investment Banking at Citi from 2007 to 2013, Director in Investment Banking at Credit Suisse from 1998 to 2007, and Vice President at NationsBank NA from 1992 to 1998, where there was a focus on leveraged finance. Mandanas holds an M.B.A. in Finance from Vanderbilt University and a Bachelor's degree in Accounting and Finance from the University of South Carolina.