{
  "schema_version": "1.1",
  "generated_at": "2026-10-22T02:01:12.716809Z",
  "evaluated_at": "2026-10-22T03:52:28.025Z",
  "reference_system": {
    "installedKwp": 10,
    "orientation": "S",
    "tiltDeg": 35,
    "systemLossPct": 14
  },
  "sources": {
    "tomorrow": {
      "attribution": {
        "text": "Weather forecast by Open-Meteo, PV estimate by GridPassport.",
        "transformation_notes": "GridPassport projects irradiance onto the configured PV array and applies public lead-magnet loss assumptions."
      },
      "model": {
        "description": "Weather-based physical PV estimate with public-safe inputs.",
        "name": "GridPassport public PV forecast model",
        "source_id": "GRIDPASSPORT_PV_PUBLIC_V1"
      },
      "weather": {
        "name": "Open-Meteo weather forecast",
        "pricing_url": "https://open-meteo.com/en/pricing",
        "public_display_allowed": true,
        "requires_commercial_license": true,
        "source_id": "OPEN_METEO",
        "terms_url": "https://open-meteo.com/en/terms"
      }
    },
    "typical_year": {
      "name": "European Commission Joint Research Centre PVGIS 5.3",
      "url": "https://joint-research-centre.ec.europa.eu/photovoltaic-geographical-information-system-pvgis_en",
      "api": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc",
      "method": "Monthly average fixed-system output calculated from a multi-year solar radiation and climate series."
    }
  },
  "license": {
    "identifier": "CC-BY-4.0",
    "name": "Creative Commons Attribution 4.0 International",
    "url": "https://creativecommons.org/licenses/by/4.0/",
    "attribution": "GridPassport Solar Dataset (CC BY 4.0), using Open-Meteo weather data (CC BY 4.0) transformed by GridPassport and typical PV profiles from European Commission JRC PVGIS.",
    "scope": "GridPassport published solar forecast CSV and JSON datasets."
  },
  "methodology_url": "https://gridpassport.com/solar-forecast/methodology/",
  "reuse_terms_url": "https://gridpassport.com/solar-forecast/methodology/#data-license",
  "location": {
    "city_id": "siegen",
    "city": "Siegen",
    "country_code": "DE",
    "country": "Germany",
    "latitude": 50.8748,
    "longitude": 8.0243,
    "timezone": "Europe/Berlin"
  },
  "forecast_status": "current",
  "tomorrow_forecast": {
    "cityId": "siegen",
    "name": "Siegen",
    "lat": 50.8748,
    "lon": 8.0243,
    "timezone": "Europe/Berlin",
    "featured": false,
    "targetDate": "2026-10-23",
    "expectedKwh": 8.7,
    "lowKwh": 5.3,
    "highKwh": 12.1,
    "bestWindowStart": "2026-10-23T13:00:00+02:00",
    "bestWindowEnd": "2026-10-23T17:00:00+02:00",
    "confidence": "medium",
    "fetchedAt": "2026-10-22T02:01:12.716809Z",
    "freshness": "fresh",
    "stale": false
  },
  "typical_year": {
    "lat": 50.8748,
    "lon": 8.0243,
    "annualKwh": 9926.43,
    "averageDailyKwh": 27.2,
    "monthly": [
      {
        "month": 1,
        "averageDailyKwh": 10.05,
        "monthlyKwh": 311.48,
        "variabilityKwh": 90.54
      },
      {
        "month": 2,
        "averageDailyKwh": 18.32,
        "monthlyKwh": 513.09,
        "variabilityKwh": 148.78
      },
      {
        "month": 3,
        "averageDailyKwh": 28.59,
        "monthlyKwh": 886.42,
        "variabilityKwh": 198.53
      },
      {
        "month": 4,
        "averageDailyKwh": 38.19,
        "monthlyKwh": 1145.58,
        "variabilityKwh": 193.56
      },
      {
        "month": 5,
        "averageDailyKwh": 38.82,
        "monthlyKwh": 1203.45,
        "variabilityKwh": 178.48
      },
      {
        "month": 6,
        "averageDailyKwh": 41.37,
        "monthlyKwh": 1241.12,
        "variabilityKwh": 157.82
      },
      {
        "month": 7,
        "averageDailyKwh": 39.79,
        "monthlyKwh": 1233.35,
        "variabilityKwh": 144.85
      },
      {
        "month": 8,
        "averageDailyKwh": 36.87,
        "monthlyKwh": 1142.88,
        "variabilityKwh": 130.92
      },
      {
        "month": 9,
        "averageDailyKwh": 32.28,
        "monthlyKwh": 968.49,
        "variabilityKwh": 142.22
      },
      {
        "month": 10,
        "averageDailyKwh": 21.49,
        "monthlyKwh": 666.16,
        "variabilityKwh": 129.43
      },
      {
        "month": 11,
        "averageDailyKwh": 11.81,
        "monthlyKwh": 354.44,
        "variabilityKwh": 111.62
      },
      {
        "month": 12,
        "averageDailyKwh": 8.39,
        "monthlyKwh": 259.97,
        "variabilityKwh": 61.32
      }
    ],
    "fetchedAt": "2026-10-21T14:01:04.011Z",
    "sourceUrl": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc?lat=50.8748&lon=8.0243&peakpower=10&loss=14&angle=35&aspect=0&outputformat=json",
    "radiationDatabase": "PVGIS-SARAH3",
    "sourcePeriod": {
      "fromYear": 2005,
      "throughYear": 2023
    }
  },
  "comparison": {
    "annual_output_rank_in_country_sample": 69,
    "country_city_count": 77,
    "annual_yield_kwh_per_kwp": 992.643
  }
}