Installing battery storage in 2026 costs roughly half what it did in 2015, but the upfront price per kWh still sits around £1,000.
The cost of home battery storage has fallen significantly over the past decade. The average installed cost for a household battery system in the UK in 2026 is between £4,500 and £7,000 for a 5–7 kWh usable capacity unit (Energy Saving Trust, 2026).
Battery storage cost per kWh in the UK is £700–£1,200 installed in 2026. A typical 5–7 kWh system costs £4,500–£7,000, with larger units offering better value.
- Average installed cost is £4,500–£7,000 for a 5–7 kWh system.
- Price per kWh ranges from £700 to £1,200 depending on system size.
- ECO+ scheme covers up to 75% of costs for low-income households.
- SEG tariffs pay 4p–15p per kWh for exported battery storage.
- Larger 10 kWh+ systems offer the lowest per-kWh cost.
- Installing battery storage in 2026 costs roughly half what it did in 2015, but the upfront price per kWh still sits around £1,000.
- The only national grant that directly cuts battery storage cost per kWh is the ECO+ scheme for low-income households.
- The Smart Export Guarantee (SEG) reduces the effective battery storage cost per kWh by paying for exported electricity.
- Quick numbers battery storage cost per kWh breakdown
- You qualify for a grant if your household income is below £31,000 in England or you receive a specific means-tested benefit.
- You do not qualify for a grant if your income is above £31,000 and you do not receive a qualifying benefit.
- How to confirm your eligibility and find a certified installer
Price per kWh of usable capacity for a typical lithium-ion unit ranges from £700 per kWh (large, 10 kWh+ systems) to £1,200 per kWh (smaller, 3–5 kWh systems) (DESNZ, 2026). The per-kWh figure is sensitive to system size: larger batteries benefit from economies of scale in installation and inverter hardware (Energy Saving Trust, 2026).
Prices are for complete, installed systems including the battery unit, inverter (if separate), AC/DC cabling, and commissioning (MCS, 2026).
The only national grant that directly cuts battery storage cost per kWh is the ECO+ scheme for low-income households.
The Energy Company Obligation (ECO+) scheme can cover up to 75% of the cost of a solar-plus-battery system for eligible households in England, Scotland, and Wales (GOV.UK, 2026). Eligibility is limited to households on specific means-tested benefits or those with a total household income below £31,000 (England) or £36,000 (Wales/Scotland) (Ofgem, 2026).
The grant is applied by the energy supplier, not the homeowner, and only covers batteries installed alongside solar PV (GOV.UK, 2026). Households not on benefits but living in the least energy-efficient homes (EPC band D or below) may qualify for a partial grant under the “broader” ECO+ route (DESNZ, 2026).
The Smart Export Guarantee (SEG) reduces the effective battery storage cost per kWh by paying for exported electricity.
The SEG pays households for electricity exported to the grid, and a battery allows you to store cheap solar power and export it during peak-rate hours (typically 4 pm–7 pm) (Ofgem, 2026). Typical SEG tariffs in 2026 range from 4p to 15p per kWh exported, with the highest rates from Octopus Energy (Outgoing Agile) and EDF (Solar Export) (DESNZ, Q1 2026; Energy Saving Trust, 2026).
A 5 kWh battery cycling daily can earn £100–£200 per year in SEG payments, effectively reducing the net cost of the system over its 10–15 year lifespan (Energy Saving Trust, 2026). SEG payments are not a grant—they are a revenue stream—but they directly improve the payback period and lower the effective per-kWh cost of storage (Ofgem, 2026).
Quick numbers battery storage cost per kWh breakdown
| System size (usable kWh) | Average installed cost (GBP) | Cost per usable kWh (GBP) | Typical annual SEG income (GBP) | Payback period (years) |
|---|---|---|---|---|
| 3 kWh | £3,600 | £1,200 | £60 | 12–14 |
| 5 kWh | £5,000 | £1,000 | £100 | 10–12 |
| 7 kWh | £6,300 | £900 | £140 | 9–11 |
| 10 kWh | £7,500 | £750 | £200 | 8–10 |
| 13.5 kWh | £9,450 | £700 | £270 | 7–9 |
Sources: DESNZ Solar PV & Battery Cost Data, 2026; MCS Data Dashboard, Q1 2026; Energy Saving Trust, 2026; Ofgem, Q1 2026.
You qualify for a grant if your household income is below £31,000 in England or you receive a specific means-tested benefit.
The ECO+ scheme is the only national grant for battery storage in 2026, and it is strictly income-linked (GOV.UK, 2026). Households in England with a combined income under £31,000 qualify for the “full” ECO+ grant (up to 75% of cost) (Ofgem, 2026). Households in Wales or Scotland with income under £36,000 qualify under the same rules (DESNZ, 2026).
Households receiving any of the following benefits automatically qualify, regardless of income: Universal Credit, Pension Credit, Child Tax Credit (with low income), Working Tax Credit (with low income), Income Support, Jobseeker’s Allowance (income-based), or Housing Benefit (GOV.UK, 2026). Households not on benefits but living in an EPC band D, E, F, or G home may qualify for a partial grant (typically 50% of cost) under the “broader” ECO+ route (DESNZ, 2026).
You do not qualify for a grant if your income is above £31,000 and you do not receive a qualifying benefit.
Households with income above £31,000 in England (or £36,000 in Wales/Scotland) and not receiving a qualifying benefit are not eligible for any national grant for battery storage in 2026 (GOV.UK, 2026). Households with an EPC band A, B, or C home are not eligible for the “broader” ECO+ route, even if income is low (Ofgem, 2026).
Households in Northern Ireland are not covered by the ECO+ scheme; they may qualify for the Northern Ireland Sustainable Energy Programme (NISEP) instead (DESNZ, 2026). Households that already have solar PV without a battery may not be eligible for a standalone battery grant—ECO+ only covers batteries installed alongside new solar (GOV.UK, 2026).
How to confirm your eligibility and find a certified installer
Use the official GOV.UK “Check if you can get ECO+ help” tool (at gov.uk/eco-plus) to enter your postcode, income, and benefit status (GOV.UK, 2026). Only installers registered with MCS (Microgeneration Certification Scheme) and TrustMark can carry out ECO+ grant-funded work (MCS, 2026; TrustMark, 2026).
For non-grant installations, MCS certification is still required to access SEG payments and for most building regulations compliance (Ofgem, 2026). Verify an installer’s MCS certificate number on the MCS public register (at mcscertified.com) (MCS, 2026). Ask the installer for a written quote that breaks down the cost per kWh of usable battery capacity, including all installation and commissioning fees (Energy Saving Trust, 2026).
Frequently Asked Questions
In 2026, the installed cost per kWh of usable capacity is £700–£1,200, according to DESNZ. A typical 5–7 kWh system costs £4,500–£7,000 installed (Energy Saving Trust, 2026).
Yes, if you have solar PV and can use SEG tariffs. A 5–7 kWh battery can save £200–£400 per year on bills by shifting solar power to peak hours (Energy Saving Trust, 2026).
Yes, ECO+ covers up to 75% of a solar-plus-battery system for eligible households in England, Scotland, and Wales. It only applies when installed with solar PV (GOV.UK, 2026).
SEG tariffs in 2026 range from 4p to 15p per kWh exported. A battery lets you export during peak hours (4 pm–7 pm) to maximise payments (Ofgem, 2026).
A 5–7 kWh battery suits a typical 3-bed semi with solar. Larger 10 kWh+ systems cost less per kWh (£700) and are better for higher energy use (Energy Saving Trust, 2026).
