Looking for commercial battery storage installers?
This site does not install batteries and has no installer partner, so it cannot introduce you to one. What it can do is make the shortlist easier: the questions that separate a sound battery energy storage system quote from a thin one are set out in our guide to comparing commercial battery quotes, the connection route every commercial battery storage installer has to follow is on the G99 application page, and the commercial battery storage UK cost bands show whether a price sits inside the published range. Send your site details and we reply by email with what the published figures say.
Battery storage for business in 2026: what's actually changed
Commercial battery storage — a behind-the-meter battery energy storage system (BESS), explained in what is a BESS — lets a UK business store electricity and use it when it is most valuable. This site is an independent, supplier-neutral guide rather than an installer: it shows the £/kWh cost bands and their sources upfront. Here is how commercial energy storage stacks up in 2026.
Published UK bands put installed costs at about £20,000 to £40,000 for 100 kWh, and £140–£240 per kWh for containerised systems of 500 kWh and above; our commercial battery storage cost guide sets out the sources. There is no UK-wide capital grant for a business battery in 2026 (see battery storage grants and funding), so the case rests on what the battery does on your site, on tax relief and VAT recovery, and, for some sites, on a grid-flexibility route.
The sharpest of those charges is the network operator’s red time band, 16:00 to 19:00 on weekdays across the Midlands in 2026/27. Our peak shaving calculator applies the published red, amber and green rates for your area to your own peak and battery size, and estimates nothing.
How the savings stack up
A well-designed system rarely relies on one saving. It shaves your weekday peak to cut red-band DUoS charges and the most expensive units; it charges on cheap overnight power and discharges into the daytime peak (energy arbitrage); if you have solar, it raises self-consumption, turning low-value export into avoided import; and on larger sites it can earn grid-flexibility revenue. Your half-hourly data shows which streams apply to your site, and our cost guide has a calculator for your own figures.
The tax and VAT position — and what competitors get wrong
Two points are routinely muddled. Capital allowances: a battery is plant and machinery, and the Annual Investment Allowance gives a 100% deduction in year one on up to £1m a year of qualifying spend. Above £1 million a year, a company claims the 50% first-year allowance on special-rate spend, which is how this site treats a battery, as HMRC treats solar panels; the rest is written down at 6% a year (see our tax guide). VAT: the 0% rate applies to homes and solely charitable buildings, and a commercial installation is standard-rated at 20%, which a VAT-registered business can normally recover. The detail is in VAT on battery storage.
Sizing, safety and the grid connection
Commercial battery sizing is driven by two numbers read from your load: power (kW), set by how much peak you want to remove or back up, and energy (kWh), set by how many hours that power must run. Our guide to kW vs kWh explains the difference. Installations follow the IET Code of Practice for Electrical Energy Storage Systems and, with BS 7671:2018+A4:2026, a new chapter on stationary battery installations. The grid connection (a G99 application to your network operator) is often the longest item in the programme. If your connection is already constrained, a battery can sometimes let you draw more power on site during peaks without reinforcement, depending on the network operator's terms.
Other sites worth reading
Storage rarely lands on its own: most commercial battery projects also involve an electrical contractor, a finance route or an existing solar array. Two installer sites publish regional pages worth reading: one on commercial solar and battery storage across Leicestershire for East Midlands sites, a Surrey guide for sites on the South Eastern network, and one on commercial battery storage in Scotland's Central Belt. Nothing you send through this site is passed to either of them.
One structural point worth making before you size anything: a battery earns most when the building around it is treated as a single system rather than a set of separate purchases. Occupancy hours, roof orientation and how much load is already met on site change the answer more than the cell chemistry does — the wider view of renewable energy for commercial buildings is a reasonable place to start if the storage question is really a whole-building question.
If the blocker is capital rather than engineering, read up on financing commercial battery storage before you commit to a purchase route. The peak-shaving calculator on this site applies the published charge bands to your own figures.
