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Utility interconnection and hosting‑capacity maps explained for municipal solar projects
Summary
Utility presenters from National Grid and Eversource walked municipal energy managers through the interconnection workflow — applications, screening, study and service agreements — and demonstrated hosting‑capacity and headroom maps to help site rooftop and ground‑mounted solar.
Utility engineers told municipal energy managers that the interconnection process starts with an application (and, where appropriate, a pre‑application) to notify the local electric distribution company of the planned site and submit a one‑line, site plan and project narrative. Will Curran, manager of National Grid’s customer energy integration team, said, “It all starts off with the application,” and described three interconnection paths: a simplified residential path (generally for systems about 25 kW and below), an expedited medium‑complexity path, and a standard path for larger rooftop, ground‑mounted or battery projects.
Curran said projects that follow the more complex paths typically enter a study stage where utility engineers assess existing distribution characteristics and identify required sub‑system upgrades. If upgrades or work are required, the utility drafts a service agreement that lays out scope, cost, schedule and payment milestones; after agreement and design, the project proceeds to construction and commissioning steps such as witness testing and meter setting before the utility issues permission to operate.
Daniel Rogers, a distribution planning engineer, demonstrated hosting‑capacity and load‑side “headroom” maps published on the system data portal. He described hosting capacity as a nodal and feeder‑level analysis that shows how much distributed generation a location can accept in the current system state and noted the maps are updated monthly with existing interconnected and pending projects. Rogers explained color coding on the maps, saying red indicates high loading (example shown: a thermal rating limited to 0.3 MW) and that constraints can stem from simple device settings or more substantial transformer or conductor upgrades.
Rogers walked through how to use feeder and nodal layers to find higher‑capacity upstream sections and choose a better point of interconnection. He emphasized these maps help with siting decisions but do not replace a formal pre‑application or study when project details require a more precise analysis. Eversource’s presenter, John Cresso, said Eversource uses parcel‑level displays and seasonal toggles for similar background calculations, allowing users to toggle generation and load views to see how capacity changes by season.
What this means for municipal managers: preliminary mapping can quickly screen candidate sites and highlight potential constraints, but developers and municipalities should expect further study and a service‑agreement stage to determine whether upgrades (and their costs) are required. The presenters advised contacting the utility early, submitting accurate application materials, and using pre‑application tools when available to reduce surprises later in the interconnection timeline.
The session continued with operations and maintenance coverage and a Q&A about decommissioning and costs.
