The Demand Response Spinning Reserve project is a pioneering demonstration of how using existing utility load-management assets can provide an important electricity system reliability resource known as spinning reserve. Providing spinning reserve with aggregated demand-side resources such as those illustrated in this report will give grid operators at California Independent System Operator (CA ISO) and Southern California Edison (SCE) a powerful, new tool to improve system reliability, prevent rolling blackouts, and lower system operating costs.The work completed to date to demonstrate the use of demand-response as spinning reserve has produced important programmatic and technical insights, including:• Target-marketing a utility's air-conditioning load-cycling program to customers served by a single distribution feeder can be a successful strategy. SCE successfully recruited a high proportion (nearly one-third) of eligible customers to participate in the demonstration.Demand Response -Spinning Reserve Demonstrationii Acknowledgments

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