Many of the fundamental characteristics of power systems are the same across countries.  Even so, the differences in polices and market designs can be striking.  Although there has been some convergence, the transformations to create electricity markets followed different paths.  Looming challenges have produced similar issues to deal with growing deployment of clean energy.  How can we balance the use of markets and mandates to ensure resource adequacy?  What are the workable methods for grid expansion and integration across national boundaries? How can we ensure enough system flexibility to manage rapidly changing patterns of available generation? What are the conditions needed to foster the necessary technological innovation?  How do the challenges of the future change or reinforce the electricity market reforms pursued over the last twenty years?  What mistakes can we avoid by learning from the experience abroad? What might other countries learn for the electricity market laboratories in the United States?  The ongoing reform discussions in Australia, Brazil, Europe, and Mexico provide fertile examples of lessons learned or to be learned.