Every Last Joule · Region record

Tamil Nadu

Provenance, tier, and validation record for india-tamil-nadu. No live curtailment figures on this page — those are on the globe.

Region id
india-tamil-nadu
Country
IND
Waste modality
Wind
Coordinates
10.50° N, 77.50° E
Estimated Data quality
Tier
estimated · T3-modelled

No live feed and no published total for this region. A typical-shape profile is scaled to a capacity-based or literature anchor.

Modelled profile, scaled to annual (±40%)

Uncertainty
±40% of peak GW

Published envelope for this tier. See the uncertainty model.

Source provenance
official-lead · Official source identified, live path not producing

An authoritative source exists and the loader is wired or scaffolded, but the live path is not producing usable data — geoblocked, auth-gated, or parser pending. The emitted snapshot falls back to modelled or last-good values.

Source
TNSLDC (Tamil Nadu State Load Despatch Centre / TANTRANSCO) — probed 2026-05-09 from Indian-IP Bangalore DO droplet: tnsldc.com timed out (no response). Site not publicly reachable even from Indian IPs. T1 blocked. Loader emits T3-modelled typical-shape calibrated to POSOCO South Region 2024 (~1.0 TWh/yr wind curtailment; India's largest wind state).

https://www.tantransco.org/

Tier, provenance, and source are read at build time from src/lib/regions.ts — the same table the globe draws from. The validation record below is generated separately and gated against it by npm run ci:docs-drift.

Validation record

Last updated: 2026-08-20 · Sprint: S1 + HB integration · Paper section: Technical Validation §4.2

Source

  • Region id: india-tamil-nadu
  • Country: IND
  • Tier: estimated
  • Kind: wind
  • Source: TNSLDC (Tamil Nadu State Load Despatch Centre / TANTRANSCO) — probed 2026-05-09 from Indian-IP Bangalore DO droplet: tnsldc.com timed out (no response). Site not publicly reachable even from Indian IPs. T1 blocked. Loader emits T3-modelled typical-shape calibrated to POSOCO South Region 2024 (~1.0 TWh/yr wind curtailment; India's largest wind state).
  • Source URL: https://www.tantransco.org/
  • Loader: india-tamil-nadu.json.ts
  • Structural gap: no
  • Region id: india-tamil-nadu
  • Country: IND
  • Tier: estimated
  • Methodology note: T2-annual-calibrated (generation denominator from CEA official source; curtailment rate modelled from Ember India 2024). Tier bucket stays T3 until tier-resolution.ts gains a T2-static path.
  • Source provenance: official-lead — generation denominator from CEA official daily Excel; curtailment rate modelled from Ember India 2024
  • Kind: wind
  • Source: CEA Renewable Project Monitoring Division — daily generation Excel, State-Wise sheet (gen-re.cea.gov.in)
  • Source URL: https://gen-re.cea.gov.in/reports
  • Excel URL pattern: https://gen-re.cea.gov.in/public/uploads/dailyReport/excel/Report-YYYY-MM-DD.xlsx
  • Loader: india-tamil-nadu.json.ts
  • CSV: data/historical/india-tamil-nadu-gen-daily.csv — committed, refreshed daily by britta

Calibration

  • Rate source documented in: docs/methodology/ (see links below)
  • Uniform across backfill years: n/a — no backfill
  • Generation source: CEA gen-re.cea.gov.in daily Excel, State-Wise sheet, Wind Energy (MU) column
  • Curtailment rate: ~5% wind — Ember India 2024 state-level estimate
  • Formula: annual_curtailed_TWh = annual_generation_TWh × 0.05 / (1 − 0.05)
  • Ember convention: rate expressed as fraction of potential (curtailed / (generated + curtailed))

Multi-year backfill annual totals

Year Backfill rows Backfill annual TWh Published TSO annual TWh Δ % Source
(no backfill or TSO anchors yet — will be populated after HB fan-out completes)

Published anchors

  • TSO annual curtailment (latest published): —
  • Ember annual: —
  • IRENA annual: —
  • Other: —
  • CEA annual generation (trailing 365 days from CSV): populated after bootstrap run
  • Ember curtailment rate: ~5% wind (Ember India 2024)
  • Ember estimated curtailment: ~1.0 TWh/yr
  • Fallback anchor (no CSV): 1.0 TWh/yr wind (POSOCO South Region 2024, unchanged)

Bad-conversions check

# Item Verdict Reason
1 DSM / deviation values used as curtailment no Ember curtailment rate applied to CEA generation; neither figure is a deviation/scheduling settlement
2 Capacity-at-risk MW used as curtailed energy MWh no CEA data is MU (= GWh, energy), not MW (capacity)
3 Instruction percentage without a generation denominator no Ember rate applied to actual wind generation TWh from CEA; denominator is explicit and official
4 Blank or dash treated as zero no Missing daily rows use withFallback to prior anchor; absent dates are not zeroed
5 Modelled fallback labelled as verified measurement partial sourceNote explicitly states: "Annual curtailed energy is derived from CEA official generation data (denominator) × Ember India 2024 state curtailment rate (modelled). Hourly shape is synthetic. Only the generation denominator is from a primary official source."

Discrepancy analysis

Pending: no backfill parquet yet for this region. Once HB.1 / HB.2 land the per-year totals for this region, this section will summarise the Δ vs TSO/Ember/IRENA and flag any year exceeding ±25%.

Known limitations

  • Curtailment rate (5%) is Ember's estimate; Tamil Nadu wind curtailment is seasonal (monsoon peak June–September) and varies with SLDC scheduling
  • Hourly shape remains synthetic (typical wind profile centred on 09:00 UTC)
  • The TNSLDC source (tnsldc.com) remains geoblocked; T1a promotion gated on Indian residential IP relay
  • Curtailment rate (5%) is Ember's estimate; Tamil Nadu wind curtailment is seasonal (monsoon peak June–September) and varies with SLDC scheduling
  • Hourly shape remains synthetic (typical wind profile centred on 09:00 UTC)
  • The TNSLDC source (tnsldc.com) remains geoblocked; T1a promotion gated on Indian residential IP relay
  • Curtailment rate (5%) is Ember's estimate; Tamil Nadu wind curtailment is seasonal (monsoon peak June–September) and varies with SLDC scheduling
  • Hourly shape remains synthetic (typical wind profile centred on 09:00 UTC)
  • The TNSLDC source (tnsldc.com) remains geoblocked; T1a promotion gated on Indian residential IP relay
  • Curtailment rate (5%) is Ember's estimate; Tamil Nadu wind curtailment is seasonal (monsoon peak June–September) and varies with SLDC scheduling
  • Hourly shape remains synthetic (typical wind profile centred on 09:00 UTC)
  • The TNSLDC source (tnsldc.com) remains geoblocked; T1a promotion gated on Indian residential IP relay
  • Curtailment rate (5%) is Ember's estimate; Tamil Nadu wind curtailment is seasonal (monsoon peak June–September) and varies with SLDC scheduling
  • Hourly shape remains synthetic (typical wind profile centred on 09:00 UTC)
  • The TNSLDC source (tnsldc.com) remains geoblocked; T1a promotion gated on Indian residential IP relay
  • Curtailment rate (5%) is Ember's estimate; Tamil Nadu wind curtailment is seasonal (monsoon peak June–September) and varies with SLDC scheduling
  • Hourly shape remains synthetic (typical wind profile centred on 09:00 UTC)
  • The TNSLDC source (tnsldc.com) remains geoblocked; T1a promotion gated on Indian residential IP relay
  • Curtailment rate (5%) is Ember's estimate; Tamil Nadu wind curtailment is seasonal (monsoon peak June–September) and varies with SLDC scheduling
  • Hourly shape remains synthetic (typical wind profile centred on 09:00 UTC)
  • The TNSLDC source (tnsldc.com) remains geoblocked; T1a promotion gated on Indian residential IP relay
  • Curtailment rate (5%) is Ember's estimate; Tamil Nadu wind curtailment is seasonal (monsoon peak June–September) and varies with SLDC scheduling
  • Hourly shape remains synthetic (typical wind profile centred on 09:00 UTC)
  • The TNSLDC source (tnsldc.com) remains geoblocked; T1a promotion gated on Indian residential IP relay
# Item Verdict Reason
1 DSM / deviation values used as curtailment no Ember curtailment rate applied to CEA generation; neither figure is a deviation/scheduling settlement
2 Capacity-at-risk MW used as curtailed energy MWh no CEA data is MU (= GWh, energy), not MW (capacity)
3 Instruction percentage without a generation denominator no Ember rate applied to actual wind generation TWh from CEA; denominator is explicit and official
4 Blank or dash treated as zero no Missing daily rows use withFallback to prior anchor; absent dates are not zeroed
5 Modelled fallback labelled as verified measurement partial sourceNote explicitly states: "Annual curtailed energy is derived from CEA official generation data (denominator) × Ember India 2024 state curtailment rate (modelled). Hourly shape is synthetic. Only the generation denominator is from a primary official source."

Current GW, 24-hour peak, 30-day TWh, and feed freshness for this region are on the globe. Cite this page as everylastjoule.com/region/india-tamil-nadu. The dataset has a DOI; see About.