A recent California study collected detailed (15-minute) electricity usage information from about 2000 homes between spring 2003 and fall 2004. Each home was assigned to one of five different tariffs with varying price and event notification schemes. The most controversial rate tested was the critical peak pricing (CPP) rate, which provided discounted rates on all but a handful of "event" days, during which peak prices exceeded 70 cents per kWh. This presentation will compare hourly load shapes for CPP customers on event and non-event days across several temperature bins.