The price of a 5 kWh home battery has halved since 2020, from around £4,500 to roughly £2,200 installed. That is not a footnote in the clean-energy story. It is the headline.
As reported by Enlit World, battery storage in the UK could soon surpass solar in new installations. The numbers back that up: in 2023, battery-only installations grew 82% year-on-year, while solar-only grew 14%. The battery is no longer the sidekick. It is becoming the main act.
Why the battery suddenly makes sense alone
The logic used to be simple: solar panels generate free daytime electricity, the battery stores the excess, and you use it at night. But the economics have flipped. Time-of-use tariffs such as Octopus Flux and EDF GoElectric let households buy grid electricity for as little as 7p/kWh between midnight and 5am, then sell it back during peak hours at 15p/kWh or more. A 5 kWh battery cycled daily can net £150-£200 a year from that arbitrage alone. Add in the avoided cost of buying peak-rate electricity, typically 30p/kWh, and the annual saving hits £400-£500.
The catch: you need a smart meter and a compatible tariff. Not every home qualifies, and the rates vary by region. But for the 40% of UK homes with unsuitable roofs for solar, north-facing, shaded, listed, or rented, a standalone battery now offers a faster payback (4-6 years) than solar panels (8-12 years).
What this means for your EPC rating, and your home’s value
Energy Performance Certificate assessors treat battery storage differently depending on the scheme. Under the current SAP 2012 methodology, a standalone battery does not directly improve the EPC score because the calculation assumes grid electricity is always available at the same price. But if the battery is paired with solar, it can boost the rating by up to 4 points, enough to jump from band D to C.
From 2025, the new SAP 10 methodology will account for time-of-use tariffs and battery arbitrage. Early modelling by the Energy Saving Trust suggests a 5 kWh battery could improve a typical 3-bed semi’s EPC by 2-3 points even without solar. That matters when you sell: a band C home sells for 5-8% more than a band D, according to Nationwide data.
Yet the government has not confirmed whether standalone batteries alone will qualify for the 0% VAT rate that applies to solar-plus-battery installations. HMRC’s current guidance is ambiguous, some installers charge 20% on battery-only, others 0%. The Treasury is expected to clarify this in the autumn Budget. If they rule in favour, expect another surge in battery-only installations.
Should you buy now or wait for cheaper batteries?
Battery prices are still falling. BloombergNEF predicts another 20% drop by 2026. But waiting has a cost: every year you delay, you pay peak electricity rates. A typical household on a standard variable tariff spends £1,200 a year on electricity. Switching to a time-of-use tariff with a battery can cut that to £700-£800, a saving of £400-£500 annually. Over two years, that is £800-£1,000 lost.
The decision depends on your roof and your appetite for risk. If you have good south-facing roof space, solar-plus-battery remains the gold standard: total bill savings of £700-£900 a year, plus the environmental benefit of exporting clean power. If your roof is suboptimal or you rent, a standalone battery from a reputable installer, GivEnergy, Tesla Powerwall, or Myenergi, is a solid bet. Just check that your chosen model is G99-certified for grid connection and compatible with your smart meter.
One practical note: installation slots for batteries are already stretching to 8-12 weeks in some regions, particularly the South East and London. If you wait until the autumn Budget announcement, you may face winter delays. The smart play is to get a quote now and ask the installer to hold the price for 90 days.
Battery storage is not the future. It is the present, and it is arriving faster than most homeowners realise.
Frequently Asked Questions
Yes, if you switch to a time-of-use tariff like Octopus Flux or EDF GoElectric. You charge the battery cheaply overnight (7p/kWh) and use it during peak hours (30p/kWh). Typical savings are £400-£500 a year for a 5 kWh battery, with payback in 4-6 years.
Under the current SAP 2012 methodology, no, but from 2025, the new SAP 10 rules will credit batteries for shifting load to off-peak times. Early modelling suggests a 2-3 point improvement for a typical home. Pairing with solar gives a bigger boost.
