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.
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. The free feasibility summary works out which streams apply to your site from your half-hourly data, 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 £1m, whether a battery is main-rate or special-rate is not settled by the statute or HMRC's manual, and our guide to capital allowances on battery storage sets out what we found. 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.
Specialists we work alongside
Storage rarely lands on its own. Most of the sites we model also involve an electrical contractor, a finance route or an existing solar array, so it is worth knowing who does what well. For installation across the East Midlands, one option is commercial solar and battery storage across Leicestershire, while ElectriFusion Solutions covers the Doncaster corridor. In South Yorkshire, solar battery storage in South Yorkshire is handled by a team we rate, and Yorkshire sites often go to domestic battery storage installers in Yorkshire where the project is residential rather than commercial.
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.
Two more worth a look if your project sits outside commercial storage. Crafted Electrics takes on the smaller electrical works that often sit alongside a battery install, and home battery storage installation is the right route when the site is a house rather than a business. Scottish sites frequently route to commercial battery storage in the Central Belt. If the blocker is capital rather than engineering, read up on financing commercial battery storage before you commit to a purchase route.
If you want the numbers for your own site, the fastest route is a free desk feasibility: send us a year of half-hourly data and we'll model the system, the value streams, and an honest payback within 3 working days.
