Answer :

The Rocky Mountain Institute's efforts in Puerto Rico's energy transformation using renewable microgrids and their release of Carbon-Free handbooks for cities and regions could both be subjects of a case study on sustainable development.

The Rocky Mountain Institute (RMI) is an organization engaged in research and initiatives focused on sustainability and the transition to a clean energy future. A case study regarding RMI could involve their efforts in Public Collaborative for Puerto Rico's Energy Future, where they worked on transforming Puerto Rico's energy grid into a more resilient system incorporating renewable energy sources, such as through the use of renewable microgrids.

Another subject of a case study could be the RMI's Carbon-Free handbooks, including both the The Carbon-Free City Handbook and The Carbon-Free Regions Handbook, offering strategic guidance and solutions for cities and regions aiming to reduce their carbon footprint and promote sustainable development.

The Rocky Mountain Institute (RMI) is a research organization dedicated to sustainability and energy efficiency solutions. RMI's case studies include projects such as the Carbon-Free City Handbook, Renewable Microgrids across the Globe, and Carbon-Free Regions Handbook. These studies focus on promoting renewable energy, sustainable development, and reducing carbon emissions.