{
  "schema_version": "1.0",
  "generated_at": "2026-08-04T18:53:40.665909Z",
  "location": {
    "city_id": "essen",
    "city": "Essen",
    "country_code": "DE",
    "country": "Germany",
    "latitude": 51.4566,
    "longitude": 7.0123,
    "timezone": "Europe/Berlin"
  },
  "reference_system": {
    "installedKwp": 10,
    "orientation": "S",
    "tiltDeg": 35,
    "systemLossPct": 14
  },
  "tomorrow_forecast": {
    "cityId": "essen",
    "name": "Essen",
    "lat": 51.4566,
    "lon": 7.0123,
    "timezone": "Europe/Berlin",
    "featured": false,
    "targetDate": "2026-08-05",
    "expectedKwh": 35,
    "lowKwh": 25.8,
    "highKwh": 42.9,
    "bestWindowStart": "2026-08-05T11:00:00+02:00",
    "bestWindowEnd": "2026-08-05T15:00:00+02:00",
    "confidence": "medium",
    "fetchedAt": "2026-08-04T18:53:40.665909Z",
    "freshness": "fresh",
    "stale": false
  },
  "typical_year": {
    "lat": 51.4566,
    "lon": 7.0123,
    "annualKwh": 10216.84,
    "averageDailyKwh": 27.99,
    "monthly": [
      {
        "month": 1,
        "averageDailyKwh": 10.95,
        "monthlyKwh": 339.55,
        "variabilityKwh": 93.08
      },
      {
        "month": 2,
        "averageDailyKwh": 18.76,
        "monthlyKwh": 525.17,
        "variabilityKwh": 137.11
      },
      {
        "month": 3,
        "averageDailyKwh": 28.59,
        "monthlyKwh": 886.19,
        "variabilityKwh": 184.93
      },
      {
        "month": 4,
        "averageDailyKwh": 38.4,
        "monthlyKwh": 1152.06,
        "variabilityKwh": 177.95
      },
      {
        "month": 5,
        "averageDailyKwh": 40.67,
        "monthlyKwh": 1260.63,
        "variabilityKwh": 159.38
      },
      {
        "month": 6,
        "averageDailyKwh": 41.95,
        "monthlyKwh": 1258.35,
        "variabilityKwh": 146.26
      },
      {
        "month": 7,
        "averageDailyKwh": 40.16,
        "monthlyKwh": 1245.08,
        "variabilityKwh": 136.9
      },
      {
        "month": 8,
        "averageDailyKwh": 37.26,
        "monthlyKwh": 1154.95,
        "variabilityKwh": 120.74
      },
      {
        "month": 9,
        "averageDailyKwh": 32.34,
        "monthlyKwh": 970.18,
        "variabilityKwh": 104.09
      },
      {
        "month": 10,
        "averageDailyKwh": 22.74,
        "monthlyKwh": 705.08,
        "variabilityKwh": 114.87
      },
      {
        "month": 11,
        "averageDailyKwh": 14.26,
        "monthlyKwh": 427.88,
        "variabilityKwh": 102.71
      },
      {
        "month": 12,
        "averageDailyKwh": 9.41,
        "monthlyKwh": 291.71,
        "variabilityKwh": 75.14
      }
    ]
  },
  "comparison": {
    "annual_output_rank_in_country_sample": 8,
    "country_city_count": 12,
    "annual_yield_kwh_per_kwp": 1021.684
  },
  "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/"
}