[
 {
  "source": "Off-peak load shifting",
  "kwh_per_year": 206,
  "how": "Water heater and dishwasher on the low tariff"
 },
 {
  "source": "Heating setback when away",
  "kwh_per_year": 118,
  "how": "Motion and presence, −3 °C after 20 min"
 },
 {
  "source": "Lights off in empty rooms",
  "kwh_per_year": 51,
  "how": "Motion sensors on plugs, not bulbs"
 },
 {
  "source": "Standby killing",
  "kwh_per_year": 37,
  "how": "Plugs cutting TV and desk cluster overnight"
 }
]