CSMAR04Testing auction mechanisms experimentally in a controlled environment provides an inexpensive means for evaluating their relative merits. This paper describes a framework for testing the efficacy of a price-responsive load on a uniform price last accepted offer and a soft-cap market. Experimental evidence to date based on uniform price market testing has shown an ability of price responsive load to mitigate high volatility and average price. The paper addresses a process to validate these results as well as our hypothesis that price responsive load will mitigate high soft cap market price behavior such as was seen in California.