greenhomesums
Ofgem price cap and time-of-use tariff tools
Compare flat, Agile, Go and Cosy tariffs against the quarterly Ofgem cap — and see how tariff choice compounds over 10 years.
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Are solar panels worth it in the UK? Calculator + honest verdict
For most UK homes solar panels pay back in 7-11 years and save £15,000+ over 25 years. Enter your postcode for a personalised estimate. Powered by PVGIS satellite data.
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EV Home Charging Cost Calculator UK
Work out the real cost of charging your electric car at home vs public chargers, across UK time-of-use tariffs (Octopus Go, Intelligent Octopus, OVO Drive Anytime, E.ON Next Drive), and compare with petrol at today's prices.
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Octopus Agile Savings Calculator UK
Estimate how much you'd save — or lose — switching to Octopus Agile from a flat tariff, by DNO region. Models load shifting, EV charging and heat pump usage against a typical Agile hourly rate curve.
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Ofgem Price Cap Impact Calculator UK
See what the new Ofgem default-tariff price cap means for your annual and monthly energy bill. Updated every quarter — compare the current cap against the one it replaced for your electricity and gas use.
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Solar battery storage UK — cost, savings & payback calculator
Solar battery storage UK: typical cost £3,000–£6,000 added to solar. Calculate combined savings from solar panels, home battery and EV charging. 15-year net benefit with live Ofgem rates.
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Solar Export Tariff Comparator UK
Compare UK Smart Export Guarantee (SEG) tariffs side-by-side. Enter your annual solar export and see exactly what each supplier — Octopus, E.ON, British Gas, EDF, OVO, Good Energy and more — will pay you per year.
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EV vs Petrol Running Cost Calculator UK
Compare the annual running cost of an electric car against an equivalent petrol car. UK figures with home vs public charging split, Octopus Go tariff presets, and post-2025 VED road tax.
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Home battery storage UK without solar — cost, payback & is it worth it?
Home battery storage UK without solar: costs £2,800–£5,500, pays back in 7–10 years on Octopus Flux. Personalised payback calculator. If you have solar, see the solar battery storage calculator.
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Octopus Cosy vs Flux Tariff Comparator UK
Side-by-side comparison of Octopus Cosy (heat-pump-tuned), Flux (battery-tuned) and the standard variable. Annual £, peak-window share, export income.