{
 "generatedAt": "2026-08-02",
 "generator": "scripts/GenerateGasHeatingValues.py 1.0.0",
 "source": "Atlas gas-composition partitions: state agency feeds and the USGS survey.",
 "filter": "Heating values between 300 and 2500 Btu/scf.",
 "currentCutoffYear": 2015,
 "note": "States in `current` have enough samples from 2015 onward to describe gas being produced today. States in `historical` do not: their samples come from the USGS survey and stop decades ago. Every entry carries its sample-year range so a figure cannot be quoted without its vintage.",
 "current": [
  {
   "state": "CO",
   "name": "Colorado",
   "current": true,
   "samples": 19485,
   "samplesAllYears": 20710,
   "medianBtuPerScf": 1210.0,
   "p10BtuPerScf": 934.0,
   "p90BtuPerScf": 1347.0,
   "firstSampleYear": 2015,
   "lastSampleYear": 2024,
   "medianSampleYear": 2021
  }
 ],
 "historical": [
  {
   "state": "TX",
   "name": "Texas",
   "current": false,
   "samples": 4602,
   "samplesAllYears": 4602,
   "medianBtuPerScf": 1067.0,
   "p10BtuPerScf": 863.1,
   "p90BtuPerScf": 1209.9,
   "firstSampleYear": 1919,
   "lastSampleYear": 2013,
   "medianSampleYear": 1969
  },
  {
   "state": "OK",
   "name": "Oklahoma",
   "current": false,
   "samples": 2943,
   "samplesAllYears": 2943,
   "medianBtuPerScf": 1073.0,
   "p10BtuPerScf": 862.0,
   "p90BtuPerScf": 1213.0,
   "firstSampleYear": 1919,
   "lastSampleYear": 2009,
   "medianSampleYear": 1968
  },
  {
   "state": "WY",
   "name": "Wyoming",
   "current": false,
   "samples": 1598,
   "samplesAllYears": 1598,
   "medianBtuPerScf": 1092.0,
   "p10BtuPerScf": 925.0,
   "p90BtuPerScf": 1270.0,
   "firstSampleYear": 1920,
   "lastSampleYear": 2012,
   "medianSampleYear": 1972
  },
  {
   "state": "NM",
   "name": "New Mexico",
   "current": false,
   "samples": 1040,
   "samplesAllYears": 1040,
   "medianBtuPerScf": 1089.0,
   "p10BtuPerScf": 712.6,
   "p90BtuPerScf": 1262.1,
   "firstSampleYear": 1924,
   "lastSampleYear": 2007,
   "medianSampleYear": 1975
  },
  {
   "state": "WV",
   "name": "West Virginia",
   "current": false,
   "samples": 479,
   "samplesAllYears": 479,
   "medianBtuPerScf": 1100.0,
   "p10BtuPerScf": 1007.8,
   "p90BtuPerScf": 1240.2,
   "firstSampleYear": 1919,
   "lastSampleYear": 2003,
   "medianSampleYear": 1964
  },
  {
   "state": "PA",
   "name": "Pennsylvania",
   "current": false,
   "samples": 390,
   "samplesAllYears": 390,
   "medianBtuPerScf": 1033.0,
   "p10BtuPerScf": 1005.0,
   "p90BtuPerScf": 1141.1,
   "firstSampleYear": 1920,
   "lastSampleYear": 2003,
   "medianSampleYear": 1966
  },
  {
   "state": "OH",
   "name": "Ohio",
   "current": false,
   "samples": 234,
   "samplesAllYears": 234,
   "medianBtuPerScf": 1071.5,
   "p10BtuPerScf": 978.3,
   "p90BtuPerScf": 1172.0,
   "firstSampleYear": 1919,
   "lastSampleYear": 2000,
   "medianSampleYear": 1965
  }
 ]
}