Solarium

Solarium

Green Energy benefit calculator

Quickly understand the savings you could make by installing green energy upgrades today.

Using sensible, aggregated data to help you quickly estimate the return an investment in green energy could produce, without complicated questions. Once you have a rough estimate and know if you want to find out more, you can register for access to our advanced tools, giving you tailored, specific, independent estimates and advice.

Average projected profit£20,958

20-year solar + battery projection

Average payback time11.3 Years

Typical solar + battery installation

Average UK electricity bill£1,265

Per year, before any upgrades

Profile confidence0%

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Representative estimate

Compare solar, storage and combined investment paths.

Baseline spend without upgrades is £37,662 over 20 years.

Solar only

Solar only

Representative estimate
Projected net profit£17,379
Payback
8.7 yrs
Annual benefit
£825
Upfront cost
£7,200
Generation
3,880.1 kWh

1,872.2 kWh self-consumed, 2,008 kWh exported.

Sensitivity range: £13,556 to £20,507.

How this scenario is calculated
  • Annual consumption uses electricity-consumption-v1-manual-seed-2026-05 at 3,800 kWh/year (good directional confidence).
  • Generation lookup uses UK Average at 907 kWh per kWp per year for a south-west roof.
  • Average semi-detached install size assumed at 4.6 kWp across 23 m2 of roof area.
  • Solar cost model uses £2,100 fixed plus £1,100 per kWp for semi-detached homes.
  • Energy prices assumed to rise by 4% per year.
  • Standing charge held constant at £201 per year.
  • Self-consumption estimated at 48% based on occupancy, day usage and storage.
Battery only

Battery only

Representative estimate
Projected net profit£275
Payback
28.4 yrs
Annual benefit
£201
Upfront cost
£5,700
Generation
0 kWh

0 kWh self-consumed, 0 kWh exported.

Sensitivity range: £214 to £324.

How this scenario is calculated
  • Annual consumption uses electricity-consumption-v1-manual-seed-2026-05 at 3,800 kWh/year (good directional confidence).
  • Generation lookup uses UK Average at 907 kWh per kWp per year for a south-west roof.
  • Average semi-detached install size assumed at 4.6 kWp across 23 m2 of roof area.
  • Solar cost model uses £2,100 fixed plus £1,100 per kWp for semi-detached homes.
  • Energy prices assumed to rise by 4% per year.
  • Standing charge held constant at £201 per year.
  • Battery-only value estimated from off-peak charging arbitrage against the import tariff.
Solar + battery

Best fit today

Representative estimate
Projected net profit£20,958
Payback
11.3 yrs
Annual benefit
£1,137
Upfront cost
£12,900
Generation
3,880.1 kWh

2,725.8 kWh self-consumed, 1,154.3 kWh exported.

Sensitivity range: £16,347 to £24,731.

How this scenario is calculated
  • Annual consumption uses electricity-consumption-v1-manual-seed-2026-05 at 3,800 kWh/year (good directional confidence).
  • Generation lookup uses UK Average at 907 kWh per kWp per year for a south-west roof.
  • Average semi-detached install size assumed at 4.6 kWp across 23 m2 of roof area.
  • Solar cost model uses £2,100 fixed plus £1,100 per kWp for semi-detached homes.
  • Energy prices assumed to rise by 4% per year.
  • Standing charge held constant at £201 per year.
  • Self-consumption estimated at 70% based on occupancy, day usage and storage.
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How this is calculated

Assumptions used for this estimate

Electricity model
Representative estimate
Estimated annual use
3,800 kWh
Model range
2,774-5,016 kWh
Monthly shape
standard-electric
Solar system
4.6 kW
Solar cost
£7,200
Battery
8.3 kWh
Battery cost
£5,700
Import tariff
28p/kWh
Export tariff
15p/kWh
Daytime use
45%
Energy inflation
4%