{
 "id": "est_solar_payback_years",
 "name": "Solar payback period by location and occupancy",
 "category": "costs",
 "value_num": [
  9,
  12
 ],
 "display": "London 9/9/9 · Manchester 10/10/11 · Aberystwyth 9/9/10 · Stirling 11/11/12 years, fuel prices as at July 2026",
 "unit": "years to payback (home all day / home half day / out all day)",
 "period_start": "2026-08-27",
 "period_end": null,
 "period_kind": "page_date",
 "deadline": null,
 "source_url": "https://energysavingtrust.org.uk/advice/solar-panels/",
 "source_org": "Energy Saving Trust",
 "checked_at": "2026-09-08",
 "recheck_by": "2026-12-08",
 "history": [],
 "public_note": "How long the Energy Saving Trust reckons a system takes to pay for itself, by city and by how much you are at home, based on fuel prices as at July 2026. Worth noting they now publish this in years rather than annual savings, so if a site quotes you an Energy Saving Trust pound figure, it is working from a table that no longer exists.",
 "next": null,
 "url": "https://hearthsum.co.uk/api/est_solar_payback_years.json"
}