Mary Beth Mandanas is Chief Executive Officer of Onyx Renewable Partners, responsible for the company’s overall strategic direction, growth and its operating performance. Mary Beth joined Onyx after serving as Chief Investment Officer for Sol Systems, LLC, a renewable energy infrastructure and impact investment company based in Washington, DC. Prior to her role at Sol Systems, Mary Beth held the position of Executive Vice President, Chief Strategy Officer, of CleanChoice Energy, Inc., a Washington, DC based company engaged in renewable energy retail supply and community solar, where she led strategic planning and was responsible for raising capital, banking/investor relations and establishing protocols for risk management and financial reporting. Prior to joining CleanChoice Energy, Mary Beth worked in corporate and investment banking for more than 20 years, principally with Credit Suisse First Boston and Citigroup, and focused in the power and utility sector. She worked with companies across multiple facets of corporate finance/strategic advisory transactions, which included capital raising, structured financings, liability/interest rate/commodity risk management, treasury operations, capital allocation strategies, dividend policy and mergers and acquisitions. Mary Beth earned her M.B.A degree from Vanderbilt University and graduated, magna cum laude, with a B.S. from the University of South Carolina.
Since July 2021, Mary Beth has served as an Independent Director, Audit Chair, on the Board of TortoiseEcofin Acquisition Corp III. In December 2021, she was nominated as an Independent Director for Energy Vault, Inc.
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Onyx Renewable Partners
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Onyx Renewable Partners L.P. ("Onyx”) is a national provider of clean energy and decarbonization solutions to commercial and industrial businesses, real estate operators, large-scale facilities including manufacturing / storage, schools and universities, and government agencies and municipalities. Onyx is helping companies create the bridge from today’s clean energy reality to tomorrow’s possibilities. Onyx’s approach to providing clean energy solutions ensures expert guidance at every step for our commercial and industrial customers. From solar energy and storage to electric vehicle charging and beyond, Onyx partners with our clients from the beginning; our team focuses on creating a long-term relationship for the life of the asset. We design, develop, finance, construct, operate and maintain our projects and portfolios. Onyx leverages its wide-ranging industry expertise to transform energy and regulatory complexities into simple clean energy solutions to reduce carbon emissions. Onyx was established in 2014 by Blackstone Group, one of the largest global private equity managers investing in the energy sector. In 2021, Blackstone formed a partnership with SDCL Energy Efficiency Income Trust (SEEIT), a global investor in sustainable energy solutions. This ownership structure provides Onyx flexibility and stable access to capital from two major institutional investors, enabling us to deliver highly customized clean energy solutions, with no initial investment from or upfront costs to our clients. Onyx Renewables is headquartered in New York City with offices and employees located nationwide. For more information, visit www.onyxrenewables.com or connect with us on LinkedIn.