This paper provides a detailed discussion of demand response (DR) as an important power system flexibility resource. It provides an overview of the various types of DR resources and some historical case studies. It then details the key services that DR resources can provide, including ensuring resource adequacy, reducing energy prices through market participation and providing various ancillary services. The paper concludes with a discussion of the challenges faced by DR programs, and the authors provide recommendations for facilitating maximum DR participation and use moving forward.
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