ENTERPRISE API · IES TASKFORCE TRACK

Substation headroom, queue depth, and forward congestion at every ISTS substation in India.

The single most-asked question in Indian renewables — is there room at this substation — has not had a clean answer. CTUIL connectivity LOAs, CEA capacity-addition data, STU substation lists, RLDC outage records, and ISTS expansion plans live in different silos. Today the answer comes from a phone call to a friendly engineer at the relevant LDC. Connectivity is now scarcer than land. The ISTS Hosting Capacity Atlas reads every public source, joins them on a substation-by-substation graph, and returns the answer in JSON — built as a TSP-conformant reference implementation under the IES v0.5 substation data model.

Run a site screen View the IES TSP conformance map

WHAT IT DOES

Three jobs, one contract

Today's headroom, queued additions, and clearance window

Send a substation ID. Receive available headroom in MW today, queued additions consuming that headroom, and an expected interconnection clearance distribution in months — not a point estimate.

Site screen by lat/lng for new builds

Send a polygon or coordinate, a target capacity, and a technology. Receive a ranked list of candidate substations with headroom, queue depth, distance, terrain class, and district-level open-access economics for the load you'll evacuate against.

Year-3 curtailment forecast at the same node

Every headroom response carries the expected year-3 curtailment in P50 and P90, sourced from the same dispatch model that powers the Curtailment & Capture-Rate API. The two products share a backbone.

WHY NOW

The window

The ISTS waiver sunset has rewritten the economics of every project on the books. The IES Taskforce v1.0 launch in July 2026 is the single largest opportunity to position substation data on a national standard rather than a vendor format. Every developer is queueing up; every queue is opaque. A buyer who can read the queue clearly is a buyer who stops underwriting projects that cannot evacuate.

SAMPLE

See the call

A 220 kV substation near Bhadla, returning 280 MW of headroom today, 150 MW of queued additions, an expected interconnection clearance of 14 to 18 months, and an 8 percent year-3 curtailment forecast.

Requestbash

curl https://api.energymap.in/v1/substations/sub-NRLDC-1023/headroom \
  -H 'X-API-Key: $KEY'

Responsejson

{
  "substation_id": "sub-NRLDC-1023",
  "name": "Bhadla 220kV",
  "voltage_kv": 220,
  "today_headroom_mw": 280,
  "queued_mw": 150,
  "expected_clearance_months": { "p50": 16, "p90": 22 },
  "y3_curtailment": { "p50": 0.08, "p90": 0.14 },
  "confidence": 0.83,
  "ies_tsp": { "schema_version": "0.5", "conforms": true }
}

ENDPOINTS

Five paths

Full reference →

Method	Path	Returns
GET	/v1/substations/{id}/headroom	Headroom, queue, clearance, year-3 curtailment in one call
GET	/v1/queue/depth/{region}	Full ranked queue for a region with developer and tech metadata
POST	/v1/sites/screen	Ranked substations for a coordinate or polygon and a target capacity
GET	/v1/connectivity/forecast/{sub_id}	Probabilistic clearance timeline across the next eight quarters
GET	/v1/ists/expansion-plans	CTUIL transmission expansion plan tracker

WHO IT IS FOR

Buyers

RE developers

the 40-plus active utility-scale developers building for SECI, state DISCOM, merchant offtake

Replace the phone call to the LDC engineer, multiplied across every site you screen.

Hyperscale data centres

Microsoft · Google · Amazon · Meta · India co-location partners

Counterparty-evacuation diligence on every PPA you sign for an India campus.

Foreign IPPs

Brookfield · Macquarie · EDF Renewables · Iberdrola · Engie

Indian connectivity geography in JSON, not in years of on-the-ground intuition.

State RE policy planners

SERCs and state RE missions

Stop reconciling CTUIL, CEA, and STU views of the same substation by hand.

PPA-signing corporates

Fortune 500 with India operations

Know whether your counterparty's project will evacuate before you commit.

ACCESS

Free tier and paid plans cover this dataset. Limits and what is included on each plan live in one place: energymap.in/pricing. For DISCOM partnerships or custom geographies, email hello@energymap.in.

SOURCE: CTUIL connectivity register + RLDC outages + STU expansion plans + IES Substation TSP · UPDATED hourly · COVERAGE all-India ISTS + major InSTS · METHOD derived

NEXT STEP

Build against the contract

The endpoints are on the roadmap and the contract is published. Read the reference, plan your integration, and reserve Enterprise access.

Run a site screen View the IES TSP conformance map View in catalogue