This document provides an overview of power rationing practices and lessons learned from international case studies. It discusses the causes and implementation of rationing in Brazil during an electricity crisis in 2001-2002. Key lessons include: rationing was necessary due to supply shortfalls but had economic costs; quotas allocated to customers achieved significant demand reduction; and rationing supported longer-term power sector reforms, though it imposed hardships and was difficult politically. The document aims to distill best practices for designing and implementing rationing to balance supply and demand during electricity crises.