Ms Nelson is an director having served as a board director of nine corporations over 24 years. Through her company, PTI Resources, LLC, Ms Nelson consulted on environmental and energy policy matters from 2005 to 2019. A operations executive, Ms Nelson was the former founding president of Midwest Generation EME, LLC, an Edison International company, and vice president of operations for Edison Mission Energy. She serves as a director of two publicly traded US corporations: Cummins Inc (CMI), a engine and equipment manufacturer, and Ball Corporation (BLL), a metals container manufacturing company, and one publicly traded Canadian corporation, TransAlta Corporation (TAC), a power generation and wholesale marketing company. Ms Nelson is Chairperson of the Risk Committee.