Hourly net interchange MW + MWh per state — positive = import, negative = export.
Per-state hourly net interchange aggregated from POSOCO RLDC schedules and intra-state pool settlements. Drives the 'where is the power going' band on every state page.
GET /api/intelligence/state-interchange?state=<slug>
{
"state_slug": "tamil-nadu",
"points": [
{
"hour_utc": "2026-05-26T08:00:00+00:00",
"interchange_mw": 1850
}
]
}