{
  "schema_version": "1.0",
  "generated_at": "2026-08-04T18:53:42.255636Z",
  "location": {
    "city_id": "sheffield",
    "city": "Sheffield",
    "country_code": "GB",
    "country": "United Kingdom",
    "latitude": 53.383,
    "longitude": -1.4659,
    "timezone": "Europe/London"
  },
  "reference_system": {
    "installedKwp": 10,
    "orientation": "S",
    "tiltDeg": 35,
    "systemLossPct": 14
  },
  "tomorrow_forecast": {
    "cityId": "sheffield",
    "name": "Sheffield",
    "lat": 53.383,
    "lon": -1.4659,
    "timezone": "Europe/London",
    "featured": false,
    "targetDate": "2026-08-05",
    "expectedKwh": 20.1,
    "lowKwh": 13.2,
    "highKwh": 26.1,
    "bestWindowStart": "2026-08-05T08:00:00+01:00",
    "bestWindowEnd": "2026-08-05T12:00:00+01:00",
    "confidence": "medium",
    "fetchedAt": "2026-08-04T18:53:42.255636Z",
    "freshness": "fresh",
    "stale": false
  },
  "typical_year": {
    "lat": 53.383,
    "lon": -1.4659,
    "annualKwh": 9443.1,
    "averageDailyKwh": 25.87,
    "monthly": [
      {
        "month": 1,
        "averageDailyKwh": 11.06,
        "monthlyKwh": 342.83,
        "variabilityKwh": 66.61
      },
      {
        "month": 2,
        "averageDailyKwh": 17.57,
        "monthlyKwh": 491.98,
        "variabilityKwh": 96.23
      },
      {
        "month": 3,
        "averageDailyKwh": 26.8,
        "monthlyKwh": 830.82,
        "variabilityKwh": 150.58
      },
      {
        "month": 4,
        "averageDailyKwh": 35.74,
        "monthlyKwh": 1072.34,
        "variabilityKwh": 153.24
      },
      {
        "month": 5,
        "averageDailyKwh": 38.09,
        "monthlyKwh": 1180.93,
        "variabilityKwh": 128.61
      },
      {
        "month": 6,
        "averageDailyKwh": 37.58,
        "monthlyKwh": 1127.39,
        "variabilityKwh": 129.97
      },
      {
        "month": 7,
        "averageDailyKwh": 37.32,
        "monthlyKwh": 1156.88,
        "variabilityKwh": 136
      },
      {
        "month": 8,
        "averageDailyKwh": 34.63,
        "monthlyKwh": 1073.39,
        "variabilityKwh": 86.8
      },
      {
        "month": 9,
        "averageDailyKwh": 29.13,
        "monthlyKwh": 873.88,
        "variabilityKwh": 55.08
      },
      {
        "month": 10,
        "averageDailyKwh": 19.37,
        "monthlyKwh": 600.54,
        "variabilityKwh": 89.17
      },
      {
        "month": 11,
        "averageDailyKwh": 13.19,
        "monthlyKwh": 395.77,
        "variabilityKwh": 75.15
      },
      {
        "month": 12,
        "averageDailyKwh": 9.56,
        "monthlyKwh": 296.34,
        "variabilityKwh": 45.91
      }
    ]
  },
  "comparison": {
    "annual_output_rank_in_country_sample": 8,
    "country_city_count": 12,
    "annual_yield_kwh_per_kwp": 944.3100000000001
  },
  "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/"
}