{
  "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
        }
      ]
    },
    {
      "id": "swis-rooftop-watts-per-person-by-area",
      "title": "Rooftop solar per resident by SA2, SWIS screening boundary, end of 2025",
      "unit": "W per person",
      "metricLabels": {
        "solarCapacityKw": "Cumulative small-scale solar capacity at 31 December 2025, kW",
        "population": "ABS estimated resident population at 30 June 2025"
      },
      "caption": "Each dot is one SA2: cumulative CER small-scale solar capacity at 31 December 2025 divided by ABS estimated resident population at 30 June 2025. 220 of the boundary's 246 areas are drawn; the 26 with fewer than 1,000 residents, 1,371 people in all, are left out because a ratio over so few residents measures the denominator, not the rooftops: the highest of them computes to 636 kilowatts per person. The boundary-wide line is the figure in the band above, every area's capacity over every area's residents. Computed by Solar Analytica from the committed SWIS DER snapshot, CER edition 2026-07.",
      "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, per area",
        "scope": "220 of 246 SA2s, those with at least 1,000 residents"
      },
      "series": [
        {
          "label": "Augusta",
          "value": 1217,
          "solarCapacityKw": 9845.13,
          "population": 8090
        },
        {
          "label": "Busselton Surrounds",
          "value": 1373,
          "solarCapacityKw": 19319.39,
          "population": 14066
        },
        {
          "label": "Margaret River",
          "value": 1117,
          "solarCapacityKw": 13491.99,
          "population": 12077
        },
        {
          "label": "Busselton - East",
          "value": 1482,
          "solarCapacityKw": 15118.1,
          "population": 10199
        },
        {
          "label": "Busselton - West",
          "value": 1359,
          "solarCapacityKw": 29561.28,
          "population": 21758
        },
        {
          "label": "Australind - Leschenault",
          "value": 1150,
          "solarCapacityKw": 25009.84,
          "population": 21751
        },
        {
          "label": "Capel",
          "value": 1356,
          "solarCapacityKw": 8175.54,
          "population": 6027
        },
        {
          "label": "College Grove - Carey Park",
          "value": 985,
          "solarCapacityKw": 7485.64,
          "population": 7602
        },
        {
          "label": "Collie",
          "value": 1110,
          "solarCapacityKw": 10608.28,
          "population": 9561
        },
        {
          "label": "Dardanup",
          "value": 1348,
          "solarCapacityKw": 5032.02,
          "population": 3734
        },
        {
          "label": "Eaton - Pelican Point",
          "value": 1112,
          "solarCapacityKw": 15024.31,
          "population": 13513
        },
        {
          "label": "Harvey",
          "value": 1418,
          "solarCapacityKw": 14829.09,
          "population": 10457
        },
        {
          "label": "East Bunbury - Glen Iris",
          "value": 1155,
          "solarCapacityKw": 9225.87,
          "population": 7991
        },
        {
          "label": "Waroona",
          "value": 1431,
          "solarCapacityKw": 6676.41,
          "population": 4665
        },
        {
          "label": "Dalyellup",
          "value": 803,
          "solarCapacityKw": 8901.83,
          "population": 11081
        },
        {
          "label": "Gelorup - Stratham",
          "value": 1085,
          "solarCapacityKw": 3498.46,
          "population": 3224
        },
        {
          "label": "South Bunbury - Bunbury",
          "value": 1129,
          "solarCapacityKw": 15375.89,
          "population": 13623
        },
        {
          "label": "Withers - Usher",
          "value": 1096,
          "solarCapacityKw": 6069.43,
          "population": 5536
        },
        {
          "label": "Bridgetown - Boyup Brook",
          "value": 1072,
          "solarCapacityKw": 8502.02,
          "population": 7931
        },
        {
          "label": "Donnybrook - Balingup",
          "value": 1581,
          "solarCapacityKw": 10589.35,
          "population": 6698
        },
        {
          "label": "Manjimup",
          "value": 1004,
          "solarCapacityKw": 5683.23,
          "population": 5661
        },
        {
          "label": "Pemberton",
          "value": 1229,
          "solarCapacityKw": 7011.32,
          "population": 5706
        },
        {
          "label": "Dawesville - Bouvard",
          "value": 1378,
          "solarCapacityKw": 14944.62,
          "population": 10844
        },
        {
          "label": "Falcon - Wannanup",
          "value": 1680,
          "solarCapacityKw": 18961.17,
          "population": 11288
        },
        {
          "label": "Greenfields",
          "value": 1066,
          "solarCapacityKw": 11737.87,
          "population": 11011
        },
        {
          "label": "Halls Head - Erskine",
          "value": 1066,
          "solarCapacityKw": 24152.93,
          "population": 22657
        },
        {
          "label": "Mandurah",
          "value": 1562,
          "solarCapacityKw": 18396.85,
          "population": 11777
        },
        {
          "label": "Mandurah - East",
          "value": 1706,
          "solarCapacityKw": 13616.84,
          "population": 7984
        },
        {
          "label": "Mandurah - North",
          "value": 1042,
          "solarCapacityKw": 28004.14,
          "population": 26873
        },
        {
          "label": "Mandurah - South",
          "value": 1117,
          "solarCapacityKw": 14446.61,
          "population": 12932
        },
        {
          "label": "Pinjarra",
          "value": 1405,
          "solarCapacityKw": 17053.76,
          "population": 12136
        },
        {
          "label": "City Beach",
          "value": 1163,
          "solarCapacityKw": 8655,
          "population": 7443
        },
        {
          "label": "Claremont (WA)",
          "value": 862,
          "solarCapacityKw": 9446.9,
          "population": 10961
        },
        {
          "label": "Cottesloe",
          "value": 814,
          "solarCapacityKw": 7289.67,
          "population": 8958
        },
        {
          "label": "Floreat",
          "value": 755,
          "solarCapacityKw": 7172.72,
          "population": 9505
        },
        {
          "label": "Mosman Park - Peppermint Grove",
          "value": 806,
          "solarCapacityKw": 9918.16,
          "population": 12310
        },
        {
          "label": "Nedlands - Dalkeith - Crawley",
          "value": 781,
          "solarCapacityKw": 17357.07,
          "population": 22236
        },
        {
          "label": "Swanbourne - Mount Claremont",
          "value": 738,
          "solarCapacityKw": 7855.84,
          "population": 10651
        },
        {
          "label": "Mount Hawthorn - Leederville",
          "value": 677,
          "solarCapacityKw": 9066.64,
          "population": 13402
        },
        {
          "label": "Mount Lawley - Inglewood",
          "value": 810,
          "solarCapacityKw": 15516.81,
          "population": 19150
        },
        {
          "label": "North Perth",
          "value": 708,
          "solarCapacityKw": 7789.37,
          "population": 10997
        },
        {
          "label": "Subiaco - Shenton Park",
          "value": 716,
          "solarCapacityKw": 14788.75,
          "population": 20645
        },
        {
          "label": "Wembley - West Leederville - Glendalough",
          "value": 781,
          "solarCapacityKw": 17146.83,
          "population": 21965
        },
        {
          "label": "East Perth",
          "value": 173,
          "solarCapacityKw": 2514.84,
          "population": 14495
        },
        {
          "label": "Perth (North) - Highgate",
          "value": 544,
          "solarCapacityKw": 7466.33,
          "population": 13732
        },
        {
          "label": "Perth (West) - Northbridge",
          "value": 380,
          "solarCapacityKw": 6035.47,
          "population": 15890
        },
        {
          "label": "Bassendean - Eden Hill - Ashfield",
          "value": 982,
          "solarCapacityKw": 17096.37,
          "population": 17413
        },
        {
          "label": "Bayswater - Embleton - Bedford",
          "value": 918,
          "solarCapacityKw": 24939.18,
          "population": 27178
        },
        {
          "label": "Maylands",
          "value": 462,
          "solarCapacityKw": 7135.61,
          "population": 15435
        },
        {
          "label": "Morley",
          "value": 934,
          "solarCapacityKw": 23761.98,
          "population": 25432
        },
        {
          "label": "Noranda",
          "value": 909,
          "solarCapacityKw": 7784.48,
          "population": 8567
        },
        {
          "label": "Chidlow",
          "value": 649,
          "solarCapacityKw": 3672.84,
          "population": 5661
        },
        {
          "label": "Glen Forrest - Darlington",
          "value": 1177,
          "solarCapacityKw": 9211.84,
          "population": 7828
        },
        {
          "label": "Helena Valley - Koongamia",
          "value": 955,
          "solarCapacityKw": 6360.41,
          "population": 6662
        },
        {
          "label": "Mundaring",
          "value": 1272,
          "solarCapacityKw": 18467.9,
          "population": 14517
        },
        {
          "label": "Swan View - Greenmount - Midvale",
          "value": 1195,
          "solarCapacityKw": 17560.25,
          "population": 14691
        },
        {
          "label": "Ballajura",
          "value": 1046,
          "solarCapacityKw": 20799.07,
          "population": 19879
        },
        {
          "label": "Beechboro",
          "value": 1185,
          "solarCapacityKw": 31914.61,
          "population": 26928
        },
        {
          "label": "Bullsbrook",
          "value": 1772,
          "solarCapacityKw": 12599.44,
          "population": 7112
        },
        {
          "label": "Gidgegannup",
          "value": 1280,
          "solarCapacityKw": 4139.29,
          "population": 3235
        },
        {
          "label": "Hazelmere - Guildford",
          "value": 1285,
          "solarCapacityKw": 9756.33,
          "population": 7590
        },
        {
          "label": "Lockridge - Kiara",
          "value": 1301,
          "solarCapacityKw": 19207.88,
          "population": 14768
        },
        {
          "label": "Middle Swan - Herne Hill",
          "value": 714,
          "solarCapacityKw": 4701.17,
          "population": 6580
        },
        {
          "label": "Midland - Guildford",
          "value": 1553,
          "solarCapacityKw": 19025.92,
          "population": 12249
        },
        {
          "label": "Stratton - Jane Brook",
          "value": 1114,
          "solarCapacityKw": 8710.99,
          "population": 7819
        },
        {
          "label": "The Vines",
          "value": 1155,
          "solarCapacityKw": 18571.15,
          "population": 16074
        },
        {
          "label": "Aveley",
          "value": 1243,
          "solarCapacityKw": 24045.25,
          "population": 19348
        },
        {
          "label": "Brabham - Henley Brook",
          "value": 1308,
          "solarCapacityKw": 23229.35,
          "population": 17755
        },
        {
          "label": "Ellenbrook",
          "value": 1301,
          "solarCapacityKw": 28465.33,
          "population": 21882
        },
        {
          "label": "Craigie - Beldon",
          "value": 1094,
          "solarCapacityKw": 13026.27,
          "population": 11907
        },
        {
          "label": "Currambine - Kinross",
          "value": 1301,
          "solarCapacityKw": 19540.49,
          "population": 15022
        },
        {
          "label": "Duncraig",
          "value": 1066,
          "solarCapacityKw": 18792.65,
          "population": 17630
        },
        {
          "label": "Greenwood - Warwick",
          "value": 1048,
          "solarCapacityKw": 15765.58,
          "population": 15038
        },
        {
          "label": "Heathridge - Connolly",
          "value": 1075,
          "solarCapacityKw": 12746.17,
          "population": 11852
        },
        {
          "label": "Hillarys",
          "value": 996,
          "solarCapacityKw": 12082.89,
          "population": 12127
        },
        {
          "label": "Iluka - Burns Beach",
          "value": 1107,
          "solarCapacityKw": 12434.85,
          "population": 11228
        },
        {
          "label": "Joondalup - Edgewater",
          "value": 1087,
          "solarCapacityKw": 17079.87,
          "population": 15713
        },
        {
          "label": "Kingsley",
          "value": 1250,
          "solarCapacityKw": 17364.07,
          "population": 13888
        },
        {
          "label": "Mullaloo - Kallaroo",
          "value": 936,
          "solarCapacityKw": 12114.82,
          "population": 12947
        },
        {
          "label": "Ocean Reef",
          "value": 1007,
          "solarCapacityKw": 9049.78,
          "population": 8985
        },
        {
          "label": "Padbury",
          "value": 1030,
          "solarCapacityKw": 10008.05,
          "population": 9714
        },
        {
          "label": "Sorrento - Marmion",
          "value": 962,
          "solarCapacityKw": 10759.87,
          "population": 11187
        },
        {
          "label": "Woodvale",
          "value": 1094,
          "solarCapacityKw": 11259.52,
          "population": 10293
        },
        {
          "label": "Balcatta - Hamersley",
          "value": 1061,
          "solarCapacityKw": 19132.38,
          "population": 18025
        },
        {
          "label": "Balga - Mirrabooka",
          "value": 424,
          "solarCapacityKw": 10065.27,
          "population": 23741
        },
        {
          "label": "Innaloo - Doubleview",
          "value": 944,
          "solarCapacityKw": 19568.47,
          "population": 20721
        },
        {
          "label": "Karrinyup - Gwelup - Carine",
          "value": 789,
          "solarCapacityKw": 19391.9,
          "population": 24578
        },
        {
          "label": "Nollamara - Westminster",
          "value": 564,
          "solarCapacityKw": 12987.44,
          "population": 23030
        },
        {
          "label": "Scarborough",
          "value": 612,
          "solarCapacityKw": 12530.04,
          "population": 20490
        },
        {
          "label": "Stirling - Osborne Park",
          "value": 1286,
          "solarCapacityKw": 20993.79,
          "population": 16322
        },
        {
          "label": "Trigg - North Beach - Watermans Bay",
          "value": 1116,
          "solarCapacityKw": 9985.45,
          "population": 8951
        },
        {
          "label": "Tuart Hill - Joondanna",
          "value": 561,
          "solarCapacityKw": 8233.48,
          "population": 14673
        },
        {
          "label": "Wembley Downs - Churchlands - Woodlands",
          "value": 603,
          "solarCapacityKw": 10103.76,
          "population": 16742
        },
        {
          "label": "Yokine - Coolbinia - Menora",
          "value": 558,
          "solarCapacityKw": 10512.76,
          "population": 18844
        },
        {
          "label": "Dianella - North",
          "value": 781,
          "solarCapacityKw": 10031.19,
          "population": 12840
        },
        {
          "label": "Dianella - South",
          "value": 926,
          "solarCapacityKw": 13946.55,
          "population": 15055
        },
        {
          "label": "Alexander Heights - Koondoola",
          "value": 787,
          "solarCapacityKw": 9794.73,
          "population": 12443
        },
        {
          "label": "Butler - Merriwa - Ridgewood",
          "value": 1061,
          "solarCapacityKw": 27588.44,
          "population": 26000
        },
        {
          "label": "Carramar",
          "value": 1238,
          "solarCapacityKw": 27350.83,
          "population": 22088
        },
        {
          "label": "Clarkson",
          "value": 1161,
          "solarCapacityKw": 18479.12,
          "population": 15921
        },
        {
          "label": "Girrawheen",
          "value": 837,
          "solarCapacityKw": 8595.38,
          "population": 10268
        },
        {
          "label": "Marangaroo",
          "value": 860,
          "solarCapacityKw": 9394.94,
          "population": 10923
        },
        {
          "label": "Mindarie - Quinns Rocks - Jindalee",
          "value": 912,
          "solarCapacityKw": 22581.63,
          "population": 24757
        },
        {
          "label": "Tapping - Ashby - Sinagra",
          "value": 1627,
          "solarCapacityKw": 24650.6,
          "population": 15154
        },
        {
          "label": "Alkimos - Eglinton",
          "value": 1226,
          "solarCapacityKw": 27575.53,
          "population": 22493
        },
        {
          "label": "Two Rocks",
          "value": 1342,
          "solarCapacityKw": 6996.11,
          "population": 5214
        },
        {
          "label": "Yanchep",
          "value": 1162,
          "solarCapacityKw": 16635.54,
          "population": 14322
        },
        {
          "label": "Hocking - Pearsall",
          "value": 1695,
          "solarCapacityKw": 25188.74,
          "population": 14858
        },
        {
          "label": "Landsdale",
          "value": 1158,
          "solarCapacityKw": 20670.18,
          "population": 17852
        },
        {
          "label": "Madeley - Darch",
          "value": 1144,
          "solarCapacityKw": 17789.91,
          "population": 15551
        },
        {
          "label": "Wanneroo - Sinagra",
          "value": 1406,
          "solarCapacityKw": 23381.03,
          "population": 16627
        },
        {
          "label": "Armadale - Wungong - Brookdale",
          "value": 1258,
          "solarCapacityKw": 36277.65,
          "population": 28839
        },
        {
          "label": "Camillo - Champion Lakes",
          "value": 1073,
          "solarCapacityKw": 7485.74,
          "population": 6978
        },
        {
          "label": "Kelmscott",
          "value": 1193,
          "solarCapacityKw": 13575.83,
          "population": 11381
        },
        {
          "label": "Mount Nasura - Mount Richon - Bedfordale",
          "value": 1249,
          "solarCapacityKw": 11307.32,
          "population": 9050
        },
        {
          "label": "Roleystone",
          "value": 1086,
          "solarCapacityKw": 8500.76,
          "population": 7831
        },
        {
          "label": "Seville Grove",
          "value": 1125,
          "solarCapacityKw": 14605.29,
          "population": 12981
        },
        {
          "label": "Harrisdale",
          "value": 1167,
          "solarCapacityKw": 16489.84,
          "population": 14125
        },
        {
          "label": "Piara Waters - Forrestdale",
          "value": 986,
          "solarCapacityKw": 21515.31,
          "population": 21815
        },
        {
          "label": "Belmont - Ascot - Redcliffe",
          "value": 987,
          "solarCapacityKw": 16564.18,
          "population": 16787
        },
        {
          "label": "East Victoria Park - Carlisle",
          "value": 715,
          "solarCapacityKw": 14294.4,
          "population": 19989
        },
        {
          "label": "Victoria Park - Lathlain - Burswood",
          "value": 621,
          "solarCapacityKw": 11641.34,
          "population": 18736
        },
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          "label": "Cloverdale",
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