{
  "schema_version": "1.0",
  "build": "NP176-FINAL-frozen",
  "policy": "Versions are not merged silently. Estimates, projections and observations retain provider, release and retrieval date.",
  "sources": [
    {
      "provider": "Nature",
      "vintage": "2024",
      "used": true
    },
    {
      "provider": "IEA_grids",
      "vintage": "2023",
      "used": true
    },
    {
      "provider": "IEA_COP28",
      "vintage": "2024",
      "used": true
    },
    {
      "provider": "UN_WPP",
      "vintage": "WPP 2024 GEN/01/REV1; 2023 Estimates and 2050 Medium variant",
      "used": true
    },
    {
      "provider": "WDI",
      "vintage": "API source 2; 2024 observations; API last updated 2026-07-13",
      "used": true
    },
    {
      "provider": "IMF_WEO",
      "vintage": "not used; original vintage not independently obtained",
      "used": false
    },
    {
      "provider": "EI",
      "vintage": "not used; original vintage not independently obtained",
      "used": false
    },
    {
      "provider": "IEA_EEI",
      "vintage": "web methodology page updated 2026-07-17; no licensed dataset values embedded",
      "used": true
    },
    {
      "provider": "DLE_method",
      "vintage": "Millward-Hopkins et al. 2020; method only",
      "used": true
    },
    {
      "provider": "Nature_EROI",
      "vintage": "Nature Energy 2024; Figshare version 1, file 46240243",
      "used": true
    },
    {
      "provider": "Nature_Communications_EROIsys",
      "vintage": "Slameršak et al. 2022; OSF source workbooks retrieved 2026-09-22",
      "used": true,
      "scope": "Whole-energy scenario EROI, four carriers, 2020–2100"
    }
  ],
  "unresolved": [
    "IMF WEO and Energy Institute vintages are not used by the current site; no current site result depends on them.",
    "If either provider is introduced later, the exact release must be registered before use."
  ],
  "criterion_12_scope": "PASS candidate for separation of used vintages; no claim is made that unused IMF/EI releases were obtained."
}