{
  "schema_version": "1.0",
  "generated_at": "2026-08-04T18:53:41.014184Z",
  "location": {
    "city_id": "narva",
    "city": "Narva",
    "country_code": "EE",
    "country": "Estonia",
    "latitude": 59.3797,
    "longitude": 28.1791,
    "timezone": "Europe/Tallinn"
  },
  "reference_system": {
    "installedKwp": 10,
    "orientation": "S",
    "tiltDeg": 35,
    "systemLossPct": 14
  },
  "tomorrow_forecast": {
    "cityId": "narva",
    "name": "Narva",
    "lat": 59.3797,
    "lon": 28.1791,
    "timezone": "Europe/Tallinn",
    "featured": true,
    "targetDate": "2026-08-05",
    "expectedKwh": 53.5,
    "lowKwh": 41.3,
    "highKwh": 61.5,
    "bestWindowStart": "2026-08-05T14:00:00+03:00",
    "bestWindowEnd": "2026-08-05T18:00:00+03:00",
    "confidence": "medium",
    "fetchedAt": "2026-08-04T18:53:41.014184Z",
    "freshness": "fresh",
    "stale": false
  },
  "typical_year": {
    "lat": 59.3797,
    "lon": 28.1791,
    "annualKwh": 9269.75,
    "averageDailyKwh": 25.4,
    "monthly": [
      {
        "month": 1,
        "averageDailyKwh": 4.88,
        "monthlyKwh": 151.18,
        "variabilityKwh": 50.72
      },
      {
        "month": 2,
        "averageDailyKwh": 13.86,
        "monthlyKwh": 387.97,
        "variabilityKwh": 125.41
      },
      {
        "month": 3,
        "averageDailyKwh": 29.23,
        "monthlyKwh": 906.24,
        "variabilityKwh": 215.31
      },
      {
        "month": 4,
        "averageDailyKwh": 37.94,
        "monthlyKwh": 1138.23,
        "variabilityKwh": 158.47
      },
      {
        "month": 5,
        "averageDailyKwh": 45.36,
        "monthlyKwh": 1406.28,
        "variabilityKwh": 187.27
      },
      {
        "month": 6,
        "averageDailyKwh": 46.52,
        "monthlyKwh": 1395.49,
        "variabilityKwh": 150.69
      },
      {
        "month": 7,
        "averageDailyKwh": 43.74,
        "monthlyKwh": 1355.94,
        "variabilityKwh": 157.75
      },
      {
        "month": 8,
        "averageDailyKwh": 36.24,
        "monthlyKwh": 1123.51,
        "variabilityKwh": 145.91
      },
      {
        "month": 9,
        "averageDailyKwh": 25.57,
        "monthlyKwh": 767.02,
        "variabilityKwh": 119.14
      },
      {
        "month": 10,
        "averageDailyKwh": 13.36,
        "monthlyKwh": 414.22,
        "variabilityKwh": 96.2
      },
      {
        "month": 11,
        "averageDailyKwh": 4.75,
        "monthlyKwh": 142.61,
        "variabilityKwh": 33.32
      },
      {
        "month": 12,
        "averageDailyKwh": 2.61,
        "monthlyKwh": 81.06,
        "variabilityKwh": 20.76
      }
    ]
  },
  "comparison": {
    "annual_output_rank_in_country_sample": 4,
    "country_city_count": 4,
    "annual_yield_kwh_per_kwp": 926.975
  },
  "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/"
}