Steve welcomes Mark Rothleder, the Senior Vice President and Chief Operating Officer at California Independent System Operator, to the podcast. California ISO is one of the largest ISOs in the world, delivering 300 million megawatt-hours of electricity each year and managing about 80% of the Golden State's electric flow. In part one, Mark discusses how his state's grid has changed since he joined California ISO in 1997 and how California ISO oversees the operation of the state's bulk electric power system, transmission lines, and electricity market.