{
  "schema_version": "1.0",
  "generated_at": "2026-08-04T18:53:38.819457Z",
  "location": {
    "city_id": "graz",
    "city": "Graz",
    "country_code": "AT",
    "country": "Austria",
    "latitude": 47.0707,
    "longitude": 15.4395,
    "timezone": "Europe/Vienna"
  },
  "reference_system": {
    "installedKwp": 10,
    "orientation": "S",
    "tiltDeg": 35,
    "systemLossPct": 14
  },
  "tomorrow_forecast": {
    "cityId": "graz",
    "name": "Graz",
    "lat": 47.0707,
    "lon": 15.4395,
    "timezone": "Europe/Vienna",
    "featured": true,
    "targetDate": "2026-08-05",
    "expectedKwh": 54.3,
    "lowKwh": 47.8,
    "highKwh": 56.3,
    "bestWindowStart": "2026-08-05T12:00:00+02:00",
    "bestWindowEnd": "2026-08-05T16:00:00+02:00",
    "confidence": "high",
    "fetchedAt": "2026-08-04T18:53:38.819457Z",
    "freshness": "fresh",
    "stale": false
  },
  "typical_year": {
    "lat": 47.0707,
    "lon": 15.4395,
    "annualKwh": 12216.86,
    "averageDailyKwh": 33.47,
    "monthly": [
      {
        "month": 1,
        "averageDailyKwh": 21.86,
        "monthlyKwh": 677.72,
        "variabilityKwh": 169.6
      },
      {
        "month": 2,
        "averageDailyKwh": 28.7,
        "monthlyKwh": 803.5,
        "variabilityKwh": 211.7
      },
      {
        "month": 3,
        "averageDailyKwh": 36.33,
        "monthlyKwh": 1126.09,
        "variabilityKwh": 176.28
      },
      {
        "month": 4,
        "averageDailyKwh": 40.82,
        "monthlyKwh": 1224.65,
        "variabilityKwh": 150.4
      },
      {
        "month": 5,
        "averageDailyKwh": 40.48,
        "monthlyKwh": 1254.76,
        "variabilityKwh": 129
      },
      {
        "month": 6,
        "averageDailyKwh": 42.88,
        "monthlyKwh": 1286.39,
        "variabilityKwh": 94.54
      },
      {
        "month": 7,
        "averageDailyKwh": 43.99,
        "monthlyKwh": 1363.57,
        "variabilityKwh": 106.6
      },
      {
        "month": 8,
        "averageDailyKwh": 41.4,
        "monthlyKwh": 1283.44,
        "variabilityKwh": 126.32
      },
      {
        "month": 9,
        "averageDailyKwh": 36.78,
        "monthlyKwh": 1103.36,
        "variabilityKwh": 141.25
      },
      {
        "month": 10,
        "averageDailyKwh": 30.13,
        "monthlyKwh": 933.95,
        "variabilityKwh": 122.33
      },
      {
        "month": 11,
        "averageDailyKwh": 19.82,
        "monthlyKwh": 594.62,
        "variabilityKwh": 131.47
      },
      {
        "month": 12,
        "averageDailyKwh": 18.22,
        "monthlyKwh": 564.82,
        "variabilityKwh": 94
      }
    ]
  },
  "comparison": {
    "annual_output_rank_in_country_sample": 3,
    "country_city_count": 6,
    "annual_yield_kwh_per_kwp": 1221.6860000000001
  },
  "sources": {
    "tomorrow": {
      "weather": {
        "source_id": "OPEN_METEO",
        "name": "Open-Meteo weather forecast",
        "public_display_allowed": true,
        "requires_commercial_license": true,
        "terms_url": "https://open-meteo.com/en/terms",
        "pricing_url": "https://open-meteo.com/en/pricing"
      },
      "model": {
        "source_id": "GRIDPASSPORT_PV_PUBLIC_V1",
        "name": "GridPassport public PV forecast model",
        "description": "Weather-based physical PV estimate with public-safe inputs."
      },
      "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."
      }
    },
    "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."
    }
  },
  "methodology_url": "https://gridpassport.com/solar-forecast/methodology/"
}