{
  "schema_version": "1.0",
  "generated_at": "2026-08-04T18:53:42.163133Z",
  "location": {
    "city_id": "birmingham",
    "city": "Birmingham",
    "country_code": "GB",
    "country": "United Kingdom",
    "latitude": 52.4814,
    "longitude": -1.8998,
    "timezone": "Europe/London"
  },
  "reference_system": {
    "installedKwp": 10,
    "orientation": "S",
    "tiltDeg": 35,
    "systemLossPct": 14
  },
  "tomorrow_forecast": {
    "cityId": "birmingham",
    "name": "Birmingham",
    "lat": 52.4814,
    "lon": -1.8998,
    "timezone": "Europe/London",
    "featured": false,
    "targetDate": "2026-08-05",
    "expectedKwh": 37.3,
    "lowKwh": 26.6,
    "highKwh": 47.1,
    "bestWindowStart": "2026-08-05T09:00:00+01:00",
    "bestWindowEnd": "2026-08-05T13:00:00+01:00",
    "confidence": "medium",
    "fetchedAt": "2026-08-04T18:53:42.163133Z",
    "freshness": "fresh",
    "stale": false
  },
  "typical_year": {
    "lat": 52.4814,
    "lon": -1.8998,
    "annualKwh": 9679.43,
    "averageDailyKwh": 26.52,
    "monthly": [
      {
        "month": 1,
        "averageDailyKwh": 12.01,
        "monthlyKwh": 372.21,
        "variabilityKwh": 58.36
      },
      {
        "month": 2,
        "averageDailyKwh": 18.42,
        "monthlyKwh": 515.79,
        "variabilityKwh": 101.97
      },
      {
        "month": 3,
        "averageDailyKwh": 27.12,
        "monthlyKwh": 840.61,
        "variabilityKwh": 144.38
      },
      {
        "month": 4,
        "averageDailyKwh": 36.06,
        "monthlyKwh": 1081.68,
        "variabilityKwh": 166.91
      },
      {
        "month": 5,
        "averageDailyKwh": 37.83,
        "monthlyKwh": 1172.83,
        "variabilityKwh": 136.26
      },
      {
        "month": 6,
        "averageDailyKwh": 39.02,
        "monthlyKwh": 1170.46,
        "variabilityKwh": 132.78
      },
      {
        "month": 7,
        "averageDailyKwh": 38.08,
        "monthlyKwh": 1180.54,
        "variabilityKwh": 134.17
      },
      {
        "month": 8,
        "averageDailyKwh": 34.24,
        "monthlyKwh": 1061.56,
        "variabilityKwh": 102.53
      },
      {
        "month": 9,
        "averageDailyKwh": 30.04,
        "monthlyKwh": 901.25,
        "variabilityKwh": 76.76
      },
      {
        "month": 10,
        "averageDailyKwh": 20.25,
        "monthlyKwh": 627.76,
        "variabilityKwh": 84.5
      },
      {
        "month": 11,
        "averageDailyKwh": 14.11,
        "monthlyKwh": 423.37,
        "variabilityKwh": 75.97
      },
      {
        "month": 12,
        "averageDailyKwh": 10.69,
        "monthlyKwh": 331.37,
        "variabilityKwh": 63.64
      }
    ]
  },
  "comparison": {
    "annual_output_rank_in_country_sample": 4,
    "country_city_count": 12,
    "annual_yield_kwh_per_kwp": 967.943
  },
  "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/"
}