{
  "schema_version": "1.1",
  "generated_at": "2026-10-04T22:01:40.807047Z",
  "evaluated_at": "2026-10-04T22:41:39.618Z",
  "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": "pila",
    "city": "Piła",
    "country_code": "PL",
    "country": "Poland",
    "latitude": 53.1514,
    "longitude": 16.7378,
    "timezone": "Europe/Warsaw"
  },
  "forecast_status": "current",
  "tomorrow_forecast": {
    "cityId": "pila",
    "name": "Piła",
    "lat": 53.1514,
    "lon": 16.7378,
    "timezone": "Europe/Warsaw",
    "featured": false,
    "targetDate": "2026-10-06",
    "expectedKwh": 27.5,
    "lowKwh": 19,
    "highKwh": 34.9,
    "bestWindowStart": "2026-10-06T12:00:00+02:00",
    "bestWindowEnd": "2026-10-06T16:00:00+02:00",
    "confidence": "medium",
    "fetchedAt": "2026-10-04T22:01:40.807047Z",
    "freshness": "fresh",
    "stale": false
  },
  "typical_year": {
    "lat": 53.1514,
    "lon": 16.7378,
    "annualKwh": 10030.31,
    "averageDailyKwh": 27.48,
    "monthly": [
      {
        "month": 1,
        "averageDailyKwh": 9.72,
        "monthlyKwh": 301.41,
        "variabilityKwh": 64.67
      },
      {
        "month": 2,
        "averageDailyKwh": 17.63,
        "monthlyKwh": 493.68,
        "variabilityKwh": 111.56
      },
      {
        "month": 3,
        "averageDailyKwh": 28.31,
        "monthlyKwh": 877.62,
        "variabilityKwh": 170.41
      },
      {
        "month": 4,
        "averageDailyKwh": 39.96,
        "monthlyKwh": 1198.94,
        "variabilityKwh": 177.71
      },
      {
        "month": 5,
        "averageDailyKwh": 41,
        "monthlyKwh": 1270.93,
        "variabilityKwh": 181.86
      },
      {
        "month": 6,
        "averageDailyKwh": 42.97,
        "monthlyKwh": 1289.16,
        "variabilityKwh": 128.02
      },
      {
        "month": 7,
        "averageDailyKwh": 41.1,
        "monthlyKwh": 1274.14,
        "variabilityKwh": 132.54
      },
      {
        "month": 8,
        "averageDailyKwh": 37.66,
        "monthlyKwh": 1167.47,
        "variabilityKwh": 165.46
      },
      {
        "month": 9,
        "averageDailyKwh": 33.1,
        "monthlyKwh": 992.92,
        "variabilityKwh": 153.74
      },
      {
        "month": 10,
        "averageDailyKwh": 21.12,
        "monthlyKwh": 654.72,
        "variabilityKwh": 151.92
      },
      {
        "month": 11,
        "averageDailyKwh": 9.81,
        "monthlyKwh": 294.26,
        "variabilityKwh": 73.05
      },
      {
        "month": 12,
        "averageDailyKwh": 6.94,
        "monthlyKwh": 215.08,
        "variabilityKwh": 43.63
      }
    ],
    "fetchedAt": "2026-10-04T18:06:29.132Z",
    "sourceUrl": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc?lat=53.1514&lon=16.7378&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": 40,
    "country_city_count": 40,
    "annual_yield_kwh_per_kwp": 1003.031
  }
}