Refreshed daily by an automated ingest (/india/api/ingest/power-supply), but the upstream resource only publishes one row per fiscal year — the daily re-fetch does not create history the source doesn't have.
Known caveats
A national total only — no state or region breakdown in this resource.
Not a live feed from Grid-India or CEA: report.grid-india.in has no JSON API, and every documented cea.nic.in/api/*.php endpoint timed out (504) during verification. This is a CEA-sourced dataset republished through data.gov.in instead.
A lower deficit means more of the demand placed on the grid was actually met — a sign of a more reliable power supply.
Power Supply Deficit (Energy Not Supplied) — India