{
  "slug": "swis-rooftop-trajectory-2011-2025",
  "title": "Watts per Person: Measuring the SWIS Rooftop Path Before Comparing It",
  "url": "https://solaranalytica.com/swis-rooftop-trajectory-2011-2025",
  "summary": "Rooftop solar per resident in the SWIS screening boundary, 2011 to 2025, computed from CER postcode records and ABS population for the same 246 areas. It sets out why no other market can be placed on the path yet: the cross-market series the site holds mixes rooftop with utility-scale solar and does not document its population denominator.",
  "license": "Free to use with attribution to Solar Analytica (solaranalytica.com). Underlying figures are named to their public sources below.",
  "csv": "https://solaranalytica.com/reports/swis-rooftop-trajectory-2011-2025/data.csv",
  "datePublished": "2026-10-03",
  "lastReviewed": "2026-09-25",
  "sources": [
    {
      "title": "Clean Energy Regulator: SGU solar capacity, 2011 to present and totals (postcode)",
      "url": "https://cer.gov.au/document/sgu-solar-capacity-2011-to-present-and-totals"
    },
    {
      "title": "Clean Energy Regulator: SGU solar installations, 2011 to present and totals (postcode)",
      "url": "https://cer.gov.au/document/sgu-solar-installations-2011-to-present-and-totals"
    },
    {
      "title": "ABS: Regional Population, annual SA2 estimated resident population, 2011 onward",
      "url": "https://data.api.abs.gov.au/rest/data/ABS,ABS_ANNUAL_ERP_ASGS2021,1.2.0/all?startPeriod=2011&format=csvfile"
    },
    {
      "title": "ABS: Postal Area to 2021 ASGS allocation file",
      "url": "https://www.abs.gov.au/statistics/standards/australian-statistical-geography-standard-asgs/edition-3-july-2021-june-2026/access-and-downloads/allocation-files/POA_2021_AUST.xlsx"
    }
  ],
  "figures": [
    {
      "id": "swis-rooftop-watts-per-person",
      "title": "Rooftop solar per resident, SWIS screening boundary, 2011 to 2025",
      "unit": "W per person",
      "caption": "Cumulative CER small-scale solar capacity at 31 December, including the 2001 to 2010 historic stock, divided by ABS estimated resident population at 30 June, both for the same 246 SA2s. Computed by Solar Analytica from the committed SWIS DER snapshot, CER edition 2026-07. Recent years are incomplete while certificates can still be created.",
      "provenance": {
        "dataSource": "CER small-scale solar capacity by postcode and ABS estimated resident population, via swis-der-cer-2026-07",
        "dataType": "Computed ratio of certificate-based capacity to estimated population",
        "scope": "246 SA2s, year-end stock over 30 June population"
      },
      "series": [
        {
          "label": "2011",
          "value": 76
        },
        {
          "label": "2012",
          "value": 116
        },
        {
          "label": "2013",
          "value": 142
        },
        {
          "label": "2014",
          "value": 180
        },
        {
          "label": "2015",
          "value": 218
        },
        {
          "label": "2016",
          "value": 268
        },
        {
          "label": "2017",
          "value": 340
        },
        {
          "label": "2018",
          "value": 419
        },
        {
          "label": "2019",
          "value": 508
        },
        {
          "label": "2020",
          "value": 623
        },
        {
          "label": "2021",
          "value": 745
        },
        {
          "label": "2022",
          "value": 839
        },
        {
          "label": "2023",
          "value": 907
        },
        {
          "label": "2024",
          "value": 977
        },
        {
          "label": "2025",
          "value": 1045
        }
      ]
    }
  ]
}