Energy savings calculator
How much could you save?
Tell us what you want and about your home. Works on a standard tariff or Economy 7, with or without solar.
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What are you looking for?
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2,700 kWh/yrElectricity use
e.g. 2–3 bed semi-detached
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Heating
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Not sure? Leave it on Economy 7Your tariff
We compare against today's standard price-cap rate, so the saving includes switching tariff.
Estimated saving
£446/year
Example · 4+ bed detached, electric heating
£446/year estimated saving
Venus-E 5.12 kWh + 920 W solar kit · £2,098 total
Estimated payback about 4.7 years
Why this size: Sized for a typical 2–3 bed home's evening use · fastest payback in one box
Battery size5.12 kWh
Estimated payback4.7 yrs
Savings are estimates
Rates: Ofgem Q4 2026 cap (Oct–Dec 2026), GB average, Direct Debit. Last updated 27 Aug 2026. Estimates only; your savings depend on your tariff, usage and home.