  This paper presents a comprehensive analysis of distribution grid upgrades
costs necessary to integrate Community Solar (CS) projects. The innovative
methodology proposed for this quantification is based on incremental least-cost
expansion of the distribution system, encompassing both traditional and
non-traditional grid upgrade strategies. Realistic infrastructure investment
costs are obtained using a dataset of over 2,500 feeders, including various
loading scenarios, and compared with empirical costs of integrating real CS
projects. The results are then used to evaluate costs and deferrals from the
consumers' and project developers' perspectives, assess the nature of the
infrastructure upgrades and explore the potential benefits of a strategic
siting of CS projects. This analysis is summarized in a set of regulatory and
policy recommendations to support planning and valuation aspects related to CS.
