Jae Wan Park, a Professor at UC Davis Mechanical and Aerospace Engineering, has made significant strides in the field of renewable energy systems, particularly focusing on lithium-ion batteries, energy storage systems, and fuel cells. His notable achievement includes the development of a 300 kWh electrical energy storage system (ESS) utilizing second-life electric vehicle (EV) batteries. This innovative system was commissioned and installed at UC Davis Robert Mondavi Institute (RMI) microgrid in January 2019, where it has been operational with success, demonstrating up to a remarkable 60% reduction in peak power demand. In addition to his academic contributions, Park is also an entrepreneur, having founded RePurpose Energy, Inc. in January 2018 alongside his students and a postdoctoral researcher. The company's primary objective is to commercialize the ESS technology leveraging second-life batteries. Their efforts have been recognized in various startup competitions, including Big Ideas hosted by UC Berkeley, where they secured the first-place position out of 330 participants, and Big Bang! hosted by UC Davis, where they clinched the Clean Start and Energy Prize categories. Furthermore, RePurpose Energy has been successful in securing funding, having raised approximately $13 million from grants and equity funds. This financial support underscores the industry's confidence in the company's potential to drive innovation and make a meaningful impact in the field of renewable energy storage solutions.