---
pretty_name: Japan Energy Self-Sufficiency — ANRE Decomposition + World Bank Comparator
license: other
license_name: pdl-1.0
license_link: LICENSE
tags:
  - japan
  - energy
  - economics
  - government-statistics
  - macroeconomics
configs:
  - config_name: self_sufficiency_decomposition
    data_files: jpn_self_sufficiency_decomposition.csv
  - config_name: primary_supply_by_fuel
    data_files: jpn_primary_supply_by_fuel.csv
  - config_name: self_sufficiency_vs_world
    data_files: energy_self_sufficiency_jpn_vs_world.csv
---

# Japan Energy Self-Sufficiency — ANRE Fuel Decomposition + World Bank Comparator

Japan's energy self-sufficiency decomposed into fossil / renewable / nuclear contributions
(資源エネルギー庁 総合エネルギー統計, 1990–2024), with Japan's ratio (ANRE) set beside World
Bank peers on `iso3 × year`. Japan's number comes from the domestic ANRE source — not
re-published World Bank data.

## Why this exists
Most cross-country energy datasets stop at one self-sufficiency number per country per year.
This adds the layer underneath it for Japan: the official ANRE decomposition into fossil,
renewable/unutilized, and nuclear contributions, so a move in the headline ratio traces to a
fuel. The 2011–2012 Fukushima shutdown is visible directly — nuclear's contribution falls
15.0% → 0.9% in a single year.

## Tables
| File | Grain | Layer |
|------|-------|-------|
| `jpn_self_sufficiency_decomposition.csv` | `iso3, year, metric, value_pct` | L0 |
| `jpn_primary_supply_by_fuel.csv` | `iso3, year, fuel, share_pct` | L0 |
| `energy_self_sufficiency_jpn_vs_world.csv` | `iso3, country, year, self_sufficiency_pct, source` | L1 (Japan = ANRE, peers = World Bank) |

## Notes on the data
- **Two bases, don't compare line-for-line.** `jpn_primary_supply_by_fuel` is on the **HHV**
  (gross) basis and is the total supply mix (imported + domestic, sums to 100%).
  `jpn_self_sufficiency_decomposition` is on the **LHV / IEA** basis and is domestic-only —
  the three `_contribution` metrics sum to `self_sufficiency_lhv` (nuclear counted as
  domestic). So a fuel's supply share ≠ its self-sufficiency contribution (fossil is ~81% of
  supply but ~0.9% of self-sufficiency — it's imported).
- In `energy_self_sufficiency_jpn_vs_world`, **Japan appears twice** (`source` = ANRE and
  World Bank) — the two differ by ~2 pp because the conventions differ; keeping both makes the
  gap visible. Filter `source = 'World Bank WDI'` for an apples-to-apples ranking.

## Sample queries
```sql
-- Japan's decomposition around Fukushima
select year, metric, value_pct from jpn_self_sufficiency_decomposition
where year between 2009 and 2013 order by year, metric;

-- Japan vs peers on one basis, latest common year
select iso3, country, self_sufficiency_pct from energy_self_sufficiency_jpn_vs_world
where year = 2023 and source = 'World Bank WDI' order by self_sufficiency_pct desc;
```

## License & attribution
Combined sources — see the `LICENSE` file for full terms. When reusing you **must**:
- `出典：資源エネルギー庁 総合エネルギー統計（e-Stat 経由取得）を加工して作成` (PDL 1.0 requires 出典表示 + 加工明記)
- `Source: World Bank WDI (CC BY 4.0)`