Hosting Capacity

Hosting capacity describes the amount of distributed energy resources that can connect to a specific feeder or substation without violating voltage, protection, or thermal limits. Distribution utilities calculate hosting capacity to guide rooftop solar developers, community solar sponsors, and electric vehicle infrastructure planners. Transparent hosting capacity maps prevent speculative interconnection requests and enable targeted upgrades.

Calculations consider feeder topology, existing load patterns, voltage regulation equipment, and fault current levels. Utilities run time series power flow studies across representative days to determine how much additional generation or load flexibility can be accommodated. Results are often shared through GIS portals with color coded segments that update quarterly or monthly.

High hosting capacity indicates locations where developers can interconnect quickly with minimal study, while low hosting capacity highlights areas that need reconductoring, voltage regulators, or smart inverter settings. Policymakers are increasingly mandating standardized publication of hosting capacity maps to support distributed energy planning and equity goals.

As fleets of distributed storage and electric vehicles grow, hosting capacity analyses now consider bidirectional flows, smart charging protocols, and feeder level flexibility markets. Utilities that maintain accurate hosting capacity data can better align distributed programs with transmission needs and integrated resource plans.