See where the grid can still take DER. New

Map feeder polygons colored by remaining hosting capacity, then screen a proposed interconnection against headroom — on the same desktop that already holds your PLS-CADD conductors. Import the planner export you already trust; get a choropleth and a fit / shortfall answer in one panel.

Hosting capacityFeeder choropleth Interconnection screenPLS-CADD feeders DuckDB / GPKG importFindings write-back

Two honest modes

Planner data when you have it. Indicative when you don't.

Primary path: import a feeder-level remaining-capacity table (kW or MW) into DuckDB or GPKG, pair it with a staged PLS-CADD network, and color feeders by class breaks. Fallback: an indicative 0–100 index from conductor voltage × phases — clearly labeled so nobody mistakes it for a study.

Import mode — real planner hosting-capacity exports: feeder id + remaining capacity → GeoJSON FeatureCollection + class breaks.
Indicative mode — PLS-CADD conductors only; relative index with an explicit UI warning. Useful for triage, not interconnection decisions.
Screen kW — remaining vs requested → headroom, fit / shortfall, and risk severity (critical → none).
Optional findings — write constrained feeders into the Transmission findings FeatureServer for the same work-order / mission loop as clearance and vegetation.

/api/der · Ribbon → DER

// map feeders from a planner capacity table
POST /api/der/map
{ feederDbId, table, feederIdField, capacityField,
  conductorDbId, unit: "kW"|"MW" }

// screen a proposed interconnection
POST /api/der/screen
{ remainingKw: 420, requestedKw: 500 }
→ { headroomKw: -80, severity: "critical" }

GET  /api/der/capabilities   // always 200

Built for interconnection desks

Same corridor picture. Capacity on top.

Geometry comes from buffering PLS-CADD conductors grouped by circuit — so the choropleth sits on the network you already imported, not a separate GIS project.

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Feeder choropleth

Class-break coloring on remaining capacity so planners see constrained feeders at a glance.

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Interconnection screen

Quick fit check before a full study — severity ladder aligned with the rest of the Transmission findings UX.

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Pairs with PLS-CADD

Uses the same staged conductors as network trace, ROW encroachment, and corridor damage.

Honest boundary: Phase 1 does not run OpenDSS / CYME / Synergi power-flow. It maps and screens against capacity tables (or an indicative index). Full study engines remain the planner's tool of record.