This paper describes the Electricity Distribution Evaluator (EDGE) model, a MATLAB-based simulation tool developed by RMI and designed to comprehensively assess the DER value proposition in different regulatory and utility business model environments based on a detailed assessment of the technical and operational implications. Though designed to study an individual utility or region, the model maintains the flexibility to be adapted for use with many different utilities or regions. The ability to alter the model’s parameters allows RMI to identify conditions that optimize value, and to test the effects of new, innovative business models and rate structures. The EDGE model provides an analytical basis for assessment of the costs and values created by all resources, including DERs.