Thermal energy storage (TES) currently provides an established means for facilities to permanent shift some of their electricity load to lower cost, off peak hours. California utilities currently offer permanent load shifting incentives of about $875/kW to encourage more widespread use of TES. However, the full potential of these systems to provide demand response at various timescales of demand response has not yet been fully understood. In this project, control strategies that optimize load reduction and cost savings are introduced. The Demand Response Quick Assessment Tool (DRQAT) is used to evaluate these strategies. The field study will explore identifying and, ideally, demonstrating these optimal control strategies in actual applications. California facility owners can benefit directly from this project by leveraging the resulting guidance to implement load shifting in their facilities.