Note 12: Assumptions for distributed micro (domestic) and mini to large (commercial) solar PV systems:

Roof-mounted PV systems:

  • Domestic properties: 22.6 million houses (2.5m bungalows @ 76.9 sqm floor area & 1 storey; 7.8m terraced @ 82.5 sqm floor area & 2 storeys; 7.1m semi-detached @ 96.0 sqm floor area & 2 storeys; 5.1m detached @ 147 sqm floor area & 2 storeys) and 6.0 million apartments (60.9 sqm floor area & blocks of 3 storeys) with 11.2 kW (15.8 kW bungalows; 8.5 kW terraced; 9.9 kW semi-detached; 15.1 kW detached) and 4.2 kW (i.e. 12.6 kW system on average 3 storey apartment block) PV average solar PV system capacities respectively on each property
  • e. 273 GW in total and generating on average 800 kWh / kW pa [centre of gravity of properties in England is currently Crick which is located on west side of M1 and east of Rugby; average pitch of domestic roofs in UK is 40 degrees; solar array generation performance is 1050, 525, 824 and 806 kWh / kW pa for south, north, east & west orientations in Crick) = 218 TWh pa in total.
  • Commercial properties: 608 million sqm roof space (equal to floor space for single storey buildings) with 390 W solar panels (1.84m long x 1.03m wide) providing 0.206 kW capacity per sqm, i.e. 125 GW in total and generating on average 900 kWh / kW pa per kW = 112 TWh pa in total.

Existing solar farms (large [> 5 MW] ground-mounted systems):

6 GW in total generating 6 TWh pa @ 950 kWh pa per kW

Solar car parks:

5 million parking spaces (5.0m long x 2.5m wide spaces + 6.0m wide access roads i.e. 20 sqm gross car park area per parking space) with solar frame car park PV array area = 92% (8% reduction due to the combination solar car park frame configuration combined with the assumed length of solar panels) gross unshaded (20% assumed to be shaded) car park area (achieved without affecting the primary purpose of the car park) and 390 W solar panels (1.84m long x 1.03m wide) providing 0.206 kW capacity per sqm i.e. 15 GW in total and generating on average 900 kWh / kW pa = 14 TWh pa in total.

Motorway & dual carriageway solar frames:

  • Motorway solar frames: 90% length of 2,705 km motorways in England and Wales with a weighted average total width 33m (based upon 3.5 lanes [@3m wide each] per carriageway, 3m wide emergency lane and 3m wide half of central reservation per carriageway) with 390 W solar panels (1.84m long x 1.03m wide) providing 0.206 kW capacity per sqm i.e. 17 GW in total and generating on average 925 kWh / kW pa = 15 TWh pa in total.
  • Dual Carriageway solar frames: 80% length of 7,950 km dual carriageways in England and Wales with a weighted average total width 19m (based upon 7m wide carriageways and 2.5m wide emergency lanes) with 390 W solar panels (1.84m long x 1.03m wide) providing 0.206 kW capacity per sqm i.e. 21 GW in total and generating on average 900 kWh /kW pa = 19 TWh pa in total.

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