Demand-side management (DSM) resources, such as energy efficiency, demand response, or distributed generation can reduce the need for utility investment and maintenance by reducing system-wide customer demand. However, representing the benefits of demand-side management measures in IRP and other long-range resource planning modeling is an emerging topic. Few utilities consider DSM measures as static modifications to utility load forecasts, and even fewer include this resource as a candidate in their capacity expansion modeling. Utilities that do include DSM as a candidate resource in capacity expansion modeling typically only consider the energy and capacity value of this resource, which may lead to sub-optimal investment levels. Accounting for additional “non-standard” benefits of DSM may result in more optimal adoption of this resource, saving utilities investment and maintenance costs, while increasing system reliability. This report begins by describing current industry practices for including DSM in resource planning exercises, as well as multiple “non-standard” value streams not typically considered in this type of modeling. Then, taking demand response (DR) as a case study, this report presents the economic, and emissions impacts of including multiple benefits of DR in resource planning modeling. Benefits considered include transmission and distribution (T&D) deferral, reduced system losses and planning reserve margin requirements, and increased grid reliability. A sensitivity case with a carbon price is included, and multiple considerations for utility planners are provided throughout.