{
  "recalculate_national_ef": true,
  "national_ef_year": 2024,
  "recalculate_disco_efs": true,
  "disco_ef_year": 2024,
  "notes": "ENRICH_FACTORS. Current Phase 1 national location-based EF (0.5717 kgCO2e/kWh, 2020) is based on incomplete Energy Data Bank records that exclude Kainji/Jebba/Shiroro and therefore under-represent hydro by >100x. Reconciled 2020 mix (high confidence, plant-level hydro) implies ~0.45 kgCO2e/kWh; reconciled 2024 mix (high confidence, official NERC total and 30.92% hydro share) implies ~0.40 kgCO2e/kWh. National EF should be recalculated for 2024 (most recent official data) using IPCC 2006 stationary-combustion factors and the same 35% gas efficiency assumption. DisCo EFs should be recalculated for 2024 because their Q2 2024 billed-energy denominator should be paired with the same-year national fuel mix rather than the flawed 2020 mix. 2021-2023 remain medium confidence due to lack of plant-level hydro dispatch; 2020 remains a strong back-cast candidate."
}