Commercial Battery Storage in London

Behind-the-meter commercial battery storage and business backup power for London businesses across Greater London, including Croydon, Bromley, Dartford.

Why London businesses are installing battery storage

Sites just outside the M25 on the South Eastern network are covered by our Surrey guide; this page is about the London licence area.

London runs on some of the most expensive and most congested electricity in the country. Commercial battery storage attacks all three.

A behind-the-meter battery charges when power is cheap and discharges when it is dear. For a London business that means shaving the expensive 4pm-7pm peak off the demand curve, sidestepping the red-band DUoS window, and arbitraging the gap between overnight rates and daytime prices. None of these savings are speculative: they come straight off the standing structure of a commercial tariff.

This is behind-the-meter commercial battery energy storage (BESS), not a domestic battery and not a solar installation. Most London enquiries, though, are driven by grid charges and constraint, not solar.

London’s industrial geography

London’s commercial energy demand is far more concentrated than its glass-tower image suggests. Park Royal, straddling Ealing, Brent and Hammersmith, is the largest industrial estate in Europe and home to food manufacturing, cold storage, logistics and light industry: exactly the continuous, high-baseload, refrigeration-heavy loads that battery storage suits. Cold stores and bakeries run compressors and ovens around the clock, so a battery can flatten their peak draw and run profitable overnight arbitrage cycles every single day.

Brent Cross is being redeveloped into a major mixed-use town centre with significant commercial floorspace, while Stratford combines the Olympic Park legacy estate with data-adjacent and media facilities that carry steep, predictable demand. The Old Kent Road industrial area in the south remains a dense cluster of trade counters, light manufacturing and distribution, and Greenwich Peninsula mixes commercial, leisure and emerging data-centre load on a constrained part of the network.

The common thread is the kind of load that rewards storage: refrigeration, process heat, EV fleet charging and plant that cycles hard through the working day. The bigger and spikier your peak relative to your average, the more a 2-hour battery, say a 250 kW / 500 kWh system, can take off your bill.

The grid picture

The distribution network operator for London is UK Power Networks, which runs the licensed networks across the capital, the South East and the East of England. Any commercial battery here connects under a G99 application to UK Power Networks (only the smallest systems use the simpler G98 route). G99 timescales vary widely depending on the available headroom at your local substation, so the application should be submitted early, in parallel with design rather than after it.

Large parts of inner and east London are genuinely constrained. Where the network is tight, UK Power Networks may grant a connection with export limitation or under an Active Network Management (ANM) scheme that curtails export at times of stress. For a behind-the-meter battery that is rarely a problem, because the value is in what you avoid importing, not what you export. This is where storage earns its keep in London: a battery lets a constrained site draw more power during peaks than its agreed import capacity allows, by discharging stored energy to cover the spike. That means you can add EV chargers, new plant or an extra shift without paying for a costly DNO reinforcement or waiting out a multi-month connection upgrade. In a city where grid headroom is the binding constraint on growth, that is often the headline benefit, ahead of the energy savings.

What it costs and saves in London

What a battery costs does not depend on the town; the sourced UK cost bands and a calculator are in our cost guide.

What varies locally is the charging structure on London bills (UK Power Networks): the time-banded network charges, including the red band, and the capacity a site has agreed. The saving comes from the shape of the site’s own half-hourly demand, so this page gives no typical payback; our peak-shaving guide explains the bands.

The tax position helps materially. The Annual Investment Allowance lets you deduct 100% of up to £1m of qualifying spend against profits in the first year. A battery is plant and machinery, and the Annual Investment Allowance covers the first £1m a year; above that, a company claims the 50% first-year allowance on special-rate spend, which is how this site treats a battery, as our tax guide explains. Commercial battery storage is standard-rated at 20% VAT, fully recoverable by any VAT-registered business; the 0% relief applies only to domestic and charitable buildings. We set out the funding and allowance detail on our grants and funding page.

Postcodes and areas we cover

This site’s guidance covers business sites across every London postcode area: E, EC, N, NW, SE, SW, W and WC, from the City and Canary Wharf through to the industrial estates of the outer boroughs. Coverage extends into the neighbouring areas of Croydon, Bromley, Dartford, Watford and Slough, and out to nearby commercial centres including Reading, Luton and Brighton. Wherever the site sits, two things decide the case: what the peak hours cost, explained in our DUoS charges guide, and what the network will allow, covered under the G99 application. The peak-shaving calculator on this site applies the published charge bands to your own figures.

London battery storage FAQs

Will a constrained London grid connection stop me installing a battery? No. A behind-the-meter battery suits a constrained UK Power Networks connection. It reduces your peak import and can let you run more load than your agreed capacity during peaks, often avoiding a reinforcement. Where the network is tight, UK Power Networks may apply export limitation or ANM, which rarely affects a behind-the-meter system whose value is in avoided import.

How long does a G99 connection take in London? It varies widely, depending on substation headroom in your area. Submit the G99 application early, in parallel with design, so the network process does not become the bottleneck.

Does my London battery get 0% VAT? No. Commercial battery storage is standard-rated at 20% VAT. As a VAT-registered business you recover that in full, so it is not a net cost, but the 0% relief applies only to domestic and charitable buildings.