​​​​​​​The Achieving Cooperative Community Equitable Solar Sources (ACCESS) project, the flagship project of NRECA's initiative Advancing Energy Access for All, aims to improve the affordability, performance, and value of solar technologies on the grid. While DER offer a multitude of benefits to co-ops and their members, the accurate valuation of such assets is often difficult due to inherent complexities and unknowns associated with the valuation process. The Pacific Northwest National Laboratory (PNNL) worked with NRECA and a selection of the co-ops to provide clarity around potential benefit streams for solar projects and the process for accurate DER valuation. This report is the output from that effort and is intended to provide a guide for cooperatives considering similar solar projects.