Alliant Energy Corporation announced that its Board of Directors has appointed Stephanie Cox as a new independent director effective February 11, 2023. In addition, Dean Oestreich, an Alliant Energy director since 2005, is retiring from the Board, effective with Ms. Cox's appointment. Ms. Cox, 54, has more than 30 years of experience in the energy sector leading strategic planning, P&L management, human resources, manufacturing and supply chain and other functional roles for global organizations.

She most recently served as Executive President of Operations at John Wood Group PLC (Wood), first joining the company in 2019 as Chief Executive Officer of Asset Solutions for the Americas. Prior to Wood, Ms. Cox had a 28-year career in a variety of executive leadership roles at Schlumberger Limited (SLB), including as President, North America Land Drilling, President of North America, President of Asia and Vice President of Human Resources. Ms. Cox graduated from Michigan State University in 1991 with a Bachelor of Arts in Supply Chain and Materials Logistics Management.

When the changes announced are completed, Alliant Energy's Board will consist of nine independent directors and the Company's Chair, President and CEO. 50% of the Board's members will be women.