{
 "recipe": "(summarised on /methodology; this text is copied into the \"recipe\" field of public/data/state-insolation-pvwatts.json):\n  1. Location per state = U.S. Census Bureau 2020 state center of population\n     (CenPop2020_Mean_ST.txt, https://www2.census.gov/geo/docs/reference/cenpop2020/CenPop2020_Mean_ST.txt).\n  2. One request per state to NLR (formerly NREL) PVWatts v8,\n     https://developer.nlr.gov/api/pvwatts/v8.json, with:\n       system_capacity=1 (kW DC), module_type=0 (standard), losses=14 (%), array_type=1 (fixed roof mount),\n       tilt=20 (degrees), azimuth=180 (due south), dataset=nsrdb (NSRDB typical meteorological year).\n  3. Sunlight input = outputs.solrad_annual (kWh/m2/day on the 20-degree south-facing plane of array),\n     rounded to 2 decimals. outputs.ac_annual (kWh per kW DC per year) is recorded as a cross-check.\n  4. station_info (weather file, lat/lon, distance, weather_data_source) and version are recorded per state.",
 "endpoint": "https://developer.nlr.gov/api/pvwatts/v8.json",
 "parameters": {
  "system_capacity": 1,
  "module_type": 0,
  "losses": 14,
  "array_type": 1,
  "tilt": 20,
  "azimuth": 180,
  "dataset": "nsrdb"
 },
 "census_file": "https://www2.census.gov/geo/docs/reference/cenpop2020/CenPop2020_Mean_ST.txt",
 "census_file_sha256": "af37e0d68c617f417ef805a94c07cbb0f788863e3cc4db21a3b35f28766f2f06",
 "retrieved_utc": "2026-09-24T18:27:44Z",
 "states": {
  "AK": {
   "state": "Alaska",
   "census_center_lat": 61.408891,
   "census_center_lon": -148.961508,
   "solrad_annual_kwh_m2_day": 3.0345,
   "sunlight_input_kwh_m2_day": 3.03,
   "ac_annual_kwh_per_kw": 912.2,
   "weather_file": "3644142.csv",
   "weather_data_source": "NSRDB PSM V4 Polar tmy-2023 1.0.0",
   "station_lat": 61.38636779785156,
   "station_lon": -148.9772796630859,
   "station_distance_m": 2417,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "AL": {
   "state": "Alabama",
   "census_center_lat": 33.016191,
   "census_center_lon": -86.753353,
   "solrad_annual_kwh_m2_day": 5.2647,
   "sunlight_input_kwh_m2_day": 5.26,
   "ac_annual_kwh_per_kw": 1383.0,
   "weather_file": "922137.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 33.0099983215332,
   "station_lon": -86.73999786376953,
   "station_distance_m": 1419,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "AR": {
   "state": "Arkansas",
   "census_center_lat": 35.199251,
   "census_center_lon": -92.713212,
   "solrad_annual_kwh_m2_day": 5.1848,
   "sunlight_input_kwh_m2_day": 5.18,
   "ac_annual_kwh_per_kw": 1424.0,
   "weather_file": "789437.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 35.20999908447266,
   "station_lon": -92.69999694824219,
   "station_distance_m": 1694,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "AZ": {
   "state": "Arizona",
   "census_center_lat": 33.371388,
   "census_center_lon": -111.882468,
   "solrad_annual_kwh_m2_day": 6.5127,
   "sunlight_input_kwh_m2_day": 6.51,
   "ac_annual_kwh_per_kw": 1749.7,
   "weather_file": "77495.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 33.36999893188477,
   "station_lon": -111.9000015258789,
   "station_distance_m": 1628,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "CA": {
   "state": "California",
   "census_center_lat": 35.491035,
   "census_center_lon": -119.347852,
   "solrad_annual_kwh_m2_day": 6.1828,
   "sunlight_input_kwh_m2_day": 6.18,
   "ac_annual_kwh_per_kw": 1679.4,
   "weather_file": "97886.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 35.4900016784668,
   "station_lon": -119.3399963378906,
   "station_distance_m": 715,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "CO": {
   "state": "Colorado",
   "census_center_lat": 39.534747,
   "census_center_lon": -105.185361,
   "solrad_annual_kwh_m2_day": 5.452,
   "sunlight_input_kwh_m2_day": 5.45,
   "ac_annual_kwh_per_kw": 1550.1,
   "weather_file": "143423.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 39.52999877929688,
   "station_lon": -105.1800003051758,
   "station_distance_m": 701,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "CT": {
   "state": "Connecticut",
   "census_center_lat": 41.492835,
   "census_center_lon": -72.878714,
   "solrad_annual_kwh_m2_day": 4.6949,
   "sunlight_input_kwh_m2_day": 4.69,
   "ac_annual_kwh_per_kw": 1282.0,
   "weather_file": "1281343.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 41.4900016784668,
   "station_lon": -72.86000061035156,
   "station_distance_m": 1582,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "DC": {
   "state": "District of Columbia",
   "census_center_lat": 38.910168,
   "census_center_lon": -77.013993,
   "solrad_annual_kwh_m2_day": 4.9449,
   "sunlight_input_kwh_m2_day": 4.94,
   "ac_annual_kwh_per_kw": 1403.6,
   "weather_file": "1145399.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 38.93000030517578,
   "station_lon": -77.0199966430664,
   "station_distance_m": 2281,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "DE": {
   "state": "Delaware",
   "census_center_lat": 39.333614,
   "census_center_lon": -75.547709,
   "solrad_annual_kwh_m2_day": 4.9012,
   "sunlight_input_kwh_m2_day": 4.9,
   "ac_annual_kwh_per_kw": 1393.8,
   "weather_file": "1195091.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 39.33000183105469,
   "station_lon": -75.54000091552734,
   "station_distance_m": 772,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "FL": {
   "state": "Florida",
   "census_center_lat": 27.839295,
   "census_center_lon": -81.636016,
   "solrad_annual_kwh_m2_day": 5.7098,
   "sunlight_input_kwh_m2_day": 5.71,
   "ac_annual_kwh_per_kw": 1556.8,
   "weather_file": "1028469.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 27.85000038146973,
   "station_lon": -81.62000274658203,
   "station_distance_m": 1975,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "GA": {
   "state": "Georgia",
   "census_center_lat": 33.410677,
   "census_center_lon": -83.891248,
   "solrad_annual_kwh_m2_day": 5.2619,
   "sunlight_input_kwh_m2_day": 5.26,
   "ac_annual_kwh_per_kw": 1404.5,
   "weather_file": "980743.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 33.40999984741211,
   "station_lon": -83.9000015258789,
   "station_distance_m": 812,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "HI": {
   "state": "Hawaii",
   "census_center_lat": 21.112376,
   "census_center_lon": -157.485304,
   "solrad_annual_kwh_m2_day": 6.1583,
   "sunlight_input_kwh_m2_day": 6.16,
   "ac_annual_kwh_per_kw": 1713.9,
   "weather_file": "17267.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 21.1299991607666,
   "station_lon": -157.5,
   "station_distance_m": 2463,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "IA": {
   "state": "Iowa",
   "census_center_lat": 41.93663,
   "census_center_lon": -93.037218,
   "solrad_annual_kwh_m2_day": 4.7568,
   "sunlight_input_kwh_m2_day": 4.76,
   "ac_annual_kwh_per_kw": 1372.6,
   "weather_file": "782581.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 41.93000030517578,
   "station_lon": -93.0199966430664,
   "station_distance_m": 1600,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "ID": {
   "state": "Idaho",
   "census_center_lat": 44.220476,
   "census_center_lon": -115.22461,
   "solrad_annual_kwh_m2_day": 4.9777,
   "sunlight_input_kwh_m2_day": 4.98,
   "ac_annual_kwh_per_kw": 1361.5,
   "weather_file": "200237.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 44.20999908447266,
   "station_lon": -115.2200012207031,
   "station_distance_m": 1224,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "IL": {
   "state": "Illinois",
   "census_center_lat": 41.312077,
   "census_center_lon": -88.372974,
   "solrad_annual_kwh_m2_day": 4.6147,
   "sunlight_input_kwh_m2_day": 4.61,
   "ac_annual_kwh_per_kw": 1326.1,
   "weather_file": "887116.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 41.33000183105469,
   "station_lon": -88.37999725341797,
   "station_distance_m": 2089,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "IN": {
   "state": "Indiana",
   "census_center_lat": 40.144178,
   "census_center_lon": -86.251589,
   "solrad_annual_kwh_m2_day": 4.7487,
   "sunlight_input_kwh_m2_day": 4.75,
   "ac_annual_kwh_per_kw": 1353.8,
   "weather_file": "931057.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 40.13000106811523,
   "station_lon": -86.26000213623047,
   "station_distance_m": 1740,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "KS": {
   "state": "Kansas",
   "census_center_lat": 38.480984,
   "census_center_lon": -96.409286,
   "solrad_annual_kwh_m2_day": 5.2511,
   "sunlight_input_kwh_m2_day": 5.25,
   "ac_annual_kwh_per_kw": 1492.4,
   "weather_file": "710884.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 38.4900016784668,
   "station_lon": -96.41999816894531,
   "station_distance_m": 1370,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "KY": {
   "state": "Kentucky",
   "census_center_lat": 37.838308,
   "census_center_lon": -85.261296,
   "solrad_annual_kwh_m2_day": 4.8289,
   "sunlight_input_kwh_m2_day": 4.83,
   "ac_annual_kwh_per_kw": 1350.7,
   "weather_file": "951963.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 37.84999847412109,
   "station_lon": -85.26000213623047,
   "station_distance_m": 1315,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "LA": {
   "state": "Louisiana",
   "census_center_lat": 30.696198,
   "census_center_lon": -91.474266,
   "solrad_annual_kwh_m2_day": 5.301,
   "sunlight_input_kwh_m2_day": 5.3,
   "ac_annual_kwh_per_kw": 1440.1,
   "weather_file": "815615.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 30.69000053405762,
   "station_lon": -91.45999908447266,
   "station_distance_m": 1527,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "MA": {
   "state": "Massachusetts",
   "census_center_lat": 42.273659,
   "census_center_lon": -71.350366,
   "solrad_annual_kwh_m2_day": 4.7192,
   "sunlight_input_kwh_m2_day": 4.72,
   "ac_annual_kwh_per_kw": 1304.7,
   "weather_file": "1331191.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 42.29000091552734,
   "station_lon": -71.33999633789062,
   "station_distance_m": 2015,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "MD": {
   "state": "Maryland",
   "census_center_lat": 39.136636,
   "census_center_lon": -76.802227,
   "solrad_annual_kwh_m2_day": 4.8864,
   "sunlight_input_kwh_m2_day": 4.89,
   "ac_annual_kwh_per_kw": 1387.6,
   "weather_file": "1152094.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 39.13000106811523,
   "station_lon": -76.81999969482422,
   "station_distance_m": 1694,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "ME": {
   "state": "Maine",
   "census_center_lat": 44.267404,
   "census_center_lon": -69.764596,
   "solrad_annual_kwh_m2_day": 4.5313,
   "sunlight_input_kwh_m2_day": 4.53,
   "ac_annual_kwh_per_kw": 1260.3,
   "weather_file": "1381401.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 44.25,
   "station_lon": -69.77999877929688,
   "station_distance_m": 2294,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "MI": {
   "state": "Michigan",
   "census_center_lat": 42.864675,
   "census_center_lon": -84.213172,
   "solrad_annual_kwh_m2_day": 4.3967,
   "sunlight_input_kwh_m2_day": 4.4,
   "ac_annual_kwh_per_kw": 1267.8,
   "weather_file": "973493.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 42.84999847412109,
   "station_lon": -84.22000122070312,
   "station_distance_m": 1731,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "MN": {
   "state": "Minnesota",
   "census_center_lat": 45.18999,
   "census_center_lon": -93.558751,
   "solrad_annual_kwh_m2_day": 4.5932,
   "sunlight_input_kwh_m2_day": 4.59,
   "ac_annual_kwh_per_kw": 1334.6,
   "weather_file": "772314.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 45.16999816894531,
   "station_lon": -93.54000091552734,
   "station_distance_m": 2667,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "MO": {
   "state": "Missouri",
   "census_center_lat": 38.432921,
   "census_center_lon": -92.234929,
   "solrad_annual_kwh_m2_day": 4.9262,
   "sunlight_input_kwh_m2_day": 4.93,
   "ac_annual_kwh_per_kw": 1375.8,
   "weather_file": "799236.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 38.45000076293945,
   "station_lon": -92.22000122070312,
   "station_distance_m": 2308,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "MS": {
   "state": "Mississippi",
   "census_center_lat": 32.575361,
   "census_center_lon": -89.566275,
   "solrad_annual_kwh_m2_day": 5.2025,
   "sunlight_input_kwh_m2_day": 5.2,
   "ac_annual_kwh_per_kw": 1354.2,
   "weather_file": "859581.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 32.56999969482422,
   "station_lon": -89.58000183105469,
   "station_distance_m": 1414,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "MT": {
   "state": "Montana",
   "census_center_lat": 46.760509,
   "census_center_lon": -111.318567,
   "solrad_annual_kwh_m2_day": 4.7094,
   "sunlight_input_kwh_m2_day": 4.71,
   "ac_annual_kwh_per_kw": 1336.2,
   "weather_file": "231145.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 46.77000045776367,
   "station_lon": -111.3000030517578,
   "station_distance_m": 1769,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "NC": {
   "state": "North Carolina",
   "census_center_lat": 35.538715,
   "census_center_lon": -79.675021,
   "solrad_annual_kwh_m2_day": 5.2558,
   "sunlight_input_kwh_m2_day": 5.26,
   "ac_annual_kwh_per_kw": 1411.4,
   "weather_file": "1072801.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 35.52999877929688,
   "station_lon": -79.66000366210938,
   "station_distance_m": 1665,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "ND": {
   "state": "North Dakota",
   "census_center_lat": 47.33954,
   "census_center_lon": -99.444952,
   "solrad_annual_kwh_m2_day": 4.6217,
   "sunlight_input_kwh_m2_day": 4.62,
   "ac_annual_kwh_per_kw": 1342.6,
   "weather_file": "630569.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 47.33000183105469,
   "station_lon": -99.45999908447266,
   "station_distance_m": 1555,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "NE": {
   "state": "Nebraska",
   "census_center_lat": 41.167883,
   "census_center_lon": -97.222143,
   "solrad_annual_kwh_m2_day": 5.0253,
   "sunlight_input_kwh_m2_day": 5.03,
   "ac_annual_kwh_per_kw": 1442.6,
   "weather_file": "691835.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 41.16999816894531,
   "station_lon": -97.22000122070312,
   "station_distance_m": 296,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "NH": {
   "state": "New Hampshire",
   "census_center_lat": 43.149147,
   "census_center_lon": -71.455608,
   "solrad_annual_kwh_m2_day": 4.5693,
   "sunlight_input_kwh_m2_day": 4.57,
   "ac_annual_kwh_per_kw": 1258.1,
   "weather_file": "1326570.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 43.13000106811523,
   "station_lon": -71.45999908447266,
   "station_distance_m": 2167,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "NJ": {
   "state": "New Jersey",
   "census_center_lat": 40.438248,
   "census_center_lon": -74.424465,
   "solrad_annual_kwh_m2_day": 4.8672,
   "sunlight_input_kwh_m2_day": 4.87,
   "ac_annual_kwh_per_kw": 1362.5,
   "weather_file": "1231671.csv",
   "weather_data_source": "NSRDB PSM V3 GOES tmy-2020 3.2.0",
   "station_lat": 40.45000076293945,
   "station_lon": -74.41999816894531,
   "station_distance_m": 1369,
   "pvwatts_version": "8.5.0",
   "warnings": []
  },
  "NM": {
   "state": "New Mexico",
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}