{
  "schema_version": "1.0",
  "generated_at": "2026-08-04T18:53:41.382946Z",
  "location": {
    "city_id": "helsinki",
    "city": "Helsinki",
    "country_code": "FI",
    "country": "Finland",
    "latitude": 60.1699,
    "longitude": 24.9384,
    "timezone": "Europe/Helsinki"
  },
  "reference_system": {
    "installedKwp": 10,
    "orientation": "S",
    "tiltDeg": 35,
    "systemLossPct": 14
  },
  "tomorrow_forecast": {
    "cityId": "helsinki",
    "name": "Helsinki",
    "lat": 60.1699,
    "lon": 24.9384,
    "timezone": "Europe/Helsinki",
    "featured": true,
    "targetDate": "2026-08-05",
    "expectedKwh": 41.4,
    "lowKwh": 29.5,
    "highKwh": 51.9,
    "bestWindowStart": "2026-08-05T13:00:00+03:00",
    "bestWindowEnd": "2026-08-05T17:00:00+03:00",
    "confidence": "medium",
    "fetchedAt": "2026-08-04T18:53:41.382946Z",
    "freshness": "fresh",
    "stale": false
  },
  "typical_year": {
    "lat": 60.1699,
    "lon": 24.9384,
    "annualKwh": 9666.53,
    "averageDailyKwh": 26.48,
    "monthly": [
      {
        "month": 1,
        "averageDailyKwh": 4.5,
        "monthlyKwh": 139.52,
        "variabilityKwh": 44.49
      },
      {
        "month": 2,
        "averageDailyKwh": 11.5,
        "monthlyKwh": 322.11,
        "variabilityKwh": 80.53
      },
      {
        "month": 3,
        "averageDailyKwh": 27.6,
        "monthlyKwh": 855.46,
        "variabilityKwh": 157.21
      },
      {
        "month": 4,
        "averageDailyKwh": 39.19,
        "monthlyKwh": 1175.64,
        "variabilityKwh": 156.58
      },
      {
        "month": 5,
        "averageDailyKwh": 48.08,
        "monthlyKwh": 1490.5,
        "variabilityKwh": 162.11
      },
      {
        "month": 6,
        "averageDailyKwh": 49.14,
        "monthlyKwh": 1474.19,
        "variabilityKwh": 144.52
      },
      {
        "month": 7,
        "averageDailyKwh": 47.83,
        "monthlyKwh": 1482.61,
        "variabilityKwh": 108.52
      },
      {
        "month": 8,
        "averageDailyKwh": 39.21,
        "monthlyKwh": 1215.51,
        "variabilityKwh": 157.78
      },
      {
        "month": 9,
        "averageDailyKwh": 27.19,
        "monthlyKwh": 815.6,
        "variabilityKwh": 112.18
      },
      {
        "month": 10,
        "averageDailyKwh": 14.55,
        "monthlyKwh": 451.1,
        "variabilityKwh": 107.19
      },
      {
        "month": 11,
        "averageDailyKwh": 4.94,
        "monthlyKwh": 148.13,
        "variabilityKwh": 45.69
      },
      {
        "month": 12,
        "averageDailyKwh": 3.1,
        "monthlyKwh": 96.15,
        "variabilityKwh": 29.8
      }
    ]
  },
  "comparison": {
    "annual_output_rank_in_country_sample": 1,
    "country_city_count": 6,
    "annual_yield_kwh_per_kwp": 966.653
  },
  "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/"
}