Grid Hosting Capacity

Grid hosting capacity is the amount of additional distributed energy resources that a network segment can accommodate without breaching technical limits or requiring major reinforcement. It is most commonly used in distribution networks to assess how much solar, storage, electric vehicle charging, or other DER can be added at a given location.

Hosting capacity is not purely a thermal concept. It reflects the combined effect of voltage rise, reverse power flow, transformer loading, protection behavior, and control capability, which is why the result can vary sharply from feeder to feeder.

Key Aspects of Grid Hosting Capacity:

• Location-Sensitive Metric: Hosting capacity is highly dependent on where the DER connects. Two projects of the same size can have very different impacts depending on feeder impedance, existing load, and distance from the substation.
• Driven by Several Technical Limits: Voltage excursions, thermal overload, protection miscoordination, and reverse flow through transformers or regulators can each limit additional DER. The first limit reached defines the hosting capacity.
• Not a Fixed Permanent Number: The value changes with load profile, existing DER penetration, equipment settings, and reinforcement works. Smart inverters, coordinated controls, and storage can increase practical hosting capacity in some cases.
• Useful for Planning and Screening: Utilities use hosting-capacity analysis to identify constrained feeders and prioritize upgrades. Developers use it to screen potential sites before starting full interconnection studies.
• Important for DER Integration Strategy: High hosting capacity reduces connection friction and curtailment risk. Low hosting capacity may still be workable, but it often implies additional controls, export limits, or network investment.