{
  "reviewedAt": "2026-09-17",
  "demand": [
    {
      "year": 2024,
      "total_twh": 57.512,
      "sectors": {
        "households": 19.49716003182744,
        "services": 16.679377041188364,
        "industry": 15.90769185938639,
        "transport": 4.185984597919997,
        "unallocated": 1.2417864696778054,
        "explicit_additions": 0.0
      }
    },
    {
      "year": 2050,
      "total_twh": 93.36564180546513,
      "sectors": {
        "households": 22.297407540755962,
        "services": 22.943967087894556,
        "industry": 25.328021093351044,
        "transport": 21.55445961378576,
        "unallocated": 1.2417864696778054,
        "explicit_additions": 0.0
      }
    }
  ],
  "nuclear": [
    {
      "year": 2016,
      "generation_twh": 17.276
    },
    {
      "year": 2017,
      "generation_twh": 16.508
    },
    {
      "year": 2018,
      "generation_twh": 21.465
    },
    {
      "year": 2019,
      "generation_twh": 22.195
    },
    {
      "year": 2020,
      "generation_twh": 22.99
    },
    {
      "year": 2021,
      "generation_twh": 18.53
    },
    {
      "year": 2022,
      "generation_twh": 23.113
    },
    {
      "year": 2023,
      "generation_twh": 23.334
    },
    {
      "year": 2024,
      "generation_twh": 22.983
    },
    {
      "year": 2025,
      "generation_twh": 18.379
    }
  ],
  "household": {
    "status": "assumption",
    "annual_useful_heat_kwh": 12000,
    "boiler_efficiency": 0.85,
    "heat_pump_seasonal_performance": 3,
    "annual_car_km": 12000,
    "fuel_car_input_kwh_per_km": 0.6,
    "electric_car_battery_kwh_per_km": 0.18,
    "charging_efficiency": 0.9,
    "before_heat_kwh": 14117.64705882353,
    "after_heat_kwh": 4000.0,
    "before_car_kwh": 7200.0,
    "after_car_kwh": 2400.0,
    "before_total_kwh": 21317.64705882353,
    "after_total_kwh": 6400.0,
    "boundary": "Illustrative assumptions, not a representative Swiss household or a measured equipment comparison. Same useful heat and distance; purchased fuel energy before, purchased electricity after. Excludes other household uses, upstream energy, embodied energy, costs and hourly winter peaks."
  },
  "storage": {
    "status": "assumption",
    "usable_output_energy_gwh": 4,
    "output_options_gw": [
      0.5,
      1,
      2
    ],
    "duration_hours": [
      8,
      4,
      2
    ],
    "formula": "Hours = usable output GWh / constant GW",
    "boundary": "Full store, no recharge; energy is already usable at the output, so no extra discharge loss is deducted. No assertion about an actual asset, purchase cost or national demand."
  },
  "hydro": [
    {
      "id": "grimselsee",
      "name": "Grimselsee",
      "region": "Bern",
      "service": "More stored energy for winter",
      "value": 240,
      "unit": "GWh",
      "status": "Concession granted",
      "status_date": "2026-09-09",
      "detail": "Additional storage in the proposed enlargement. The building-permit phase comes next.",
      "boundary": "Additional stored energy, not an equal increase in annual generation.",
      "sources": [
        "kwo-grimselsee-project",
        "kwo-grimsel-milestones-2026"
      ]
    },
    {
      "id": "mattmark",
      "name": "Mattmark",
      "region": "Valais",
      "service": "Move production into winter",
      "value": 60,
      "unit": "GWh",
      "status": "Proposal under study",
      "status_date": "2025-01-16",
      "detail": "The operator estimates CHF 83 million. Annual production would stay unchanged.",
      "boundary": "Potential seasonal transfer. This dated release does not establish a later construction decision.",
      "sources": [
        "axpo-mattmark-project"
      ]
    },
    {
      "id": "grimsel4",
      "name": "Grimsel 4",
      "region": "Bern",
      "service": "More power between existing lakes",
      "value": 168,
      "unit": "MW",
      "status": "Construction started",
      "status_date": "2026-07-07",
      "detail": "Two 84 MW machines; a CHF 300 million investment decision. Works were scheduled to finish in 2032.",
      "boundary": "Power and flexibility. No additional reservoir volume or natural generation is credited here.",
      "sources": [
        "kwo-grimsel4-investment",
        "kwo-grimsel-milestones-2026"
      ]
    }
  ],
  "methods": {
    "demand": "Sum annual-components.csv electricity_twh by sector for central 2024 and 2050; baseline is an accounting allocation, 2050 is a conditional scenario.",
    "nuclear": "Sum four reactors in the BFE-based history each year; divide GWh by 1000. Excludes Mühleberg for all years. Retains the unresolved Gösgen 2025 BFE/operator boundary difference.",
    "hydro": "Three distinct projects selected for contrasting services and milestones; not a national total. Stages state the date of supporting evidence."
  }
}