For some businesses the saving is only half the reason to install a battery. A grid outage can mean lost cold-chain stock, a scrapped production batch, or downtime a service operation cannot recover. A battery with an islanding design keeps the critical load running through an outage, and unlike a diesel standby it works for you every other day of the year.
How ups and resilience for critical load saves a business money
We size the resilience scope around your specific must-run loads, design the islanding and transfer arrangement to G99 and BS 7671, and configure the battery to stack daily arbitrage and peak-shaving value between outages. The avoided-downtime cost becomes a modelled line in the business case, not a vague reassurance.
What makes ups and resilience for critical load pay is the part of the bill you can control: the red-band DUoS units, the capacity charge on your agreed peak, and, if you have solar, the surplus you currently export cheaply. We never lean the case on frequency-response markets, they are upside, not foundation, and we model the lot from your own meter data.
What this looks like on your site
- Rides through grid outages for critical loads, cold chain, data, process, life-safety, so an outage stops costing you stock or downtime
- Cleaner and quieter than a diesel standby, and it earns its keep with daily arbitrage between outages
- Islanding and UPS-grade designs available for zero-interruption loads
- Quantifies the avoided-downtime cost alongside the energy saving
Who it suits
Cold stores, chilled distribution, data and comms rooms, continuous-process manufacturing, and any site where an outage carries a quantifiable stock or downtime cost.
Typical ups and resilience for critical load system
| Power / capacity | 50 kW / 100 kWh - 1 MW / 2 MWh |
| Project value | £75,000-£1.4m |
| Payback | 7.5 years |
| Annual CO₂ saved | varies tonnes |
| Capital allowances | 100% AIA to £1m, then 50% FYA |
Indicative. Your figure is modelled from twelve months of half-hourly meter data. See cost and payback by size.
Compliance and safety
Islanding requires anti-islanding protection compliant with G99; transfer/changeover to BS 7671. Fire detection and suppression integrated to insurer and NFCC expectations. BS EN/IEC 62933 system safety, BS EN 62619 cell safety, BS EN 62040 for UPS-grade designs.
Every system is designed to PAS 63100:2024 fire-safety principles with lithium-iron-phosphate (LFP) cells, BS EN 62619 cell safety, and BS EN/IEC 62933 system safety, with your insurer engaged up front.
No obligation, no phone hard-sell
We build the model from your meter data and share it in full. Work is by MCS-certified, NICEIC-registered engineers, backed by a 10-year insurance-backed workmanship warranty and an itemised, fixed-price written proposal. If your demand profile does not justify a battery, we will tell you.
Common objection we hear: battery payback is always ten years. It is not, for the right profile it is six to eight, and we prove it from your own data or walk away. See the battery storage myths we debunk, or read whether commercial battery storage is worth it.
Get a free ups and resilience for critical load feasibility
Responds within one working day
- 1. Free desk feasibility from your meter data and roof, no obligation.
- 2. Site survey and a fixed-price proposal, itemised in writing.
- 3. Install and aftercare by MCS-certified engineers.
- MCS Certified
- NICEIC
- RECC
- TrustMark
Common questions
How much does battery storage for a business cost in the UK?
As a 2026 rule of thumb, fully installed commercial battery storage lands at roughly £400-£700 per kWh of usable capacity for behind-the-meter systems, falling toward £250-£400/kWh at multi-MWh scale. A typical 250 kW / 500 kWh peak-shaving system is around £150,000-£300,000; a 100 kW / 200 kWh resilience system around £75,000-£140,000; a 1 MW / 2 MWh system £600,000-£1.2m. Cost turns on the power-to-energy ratio, chemistry, switchgear, and any grid-connection works. Qualifying plant attracts 100% AIA on the first £1m and a 50% first-year allowance on the balance.
What payback should a business expect on battery storage?
For behind-the-meter systems doing peak shaving and solar self-consumption, simple payback in 2026 typically falls between six and eight years, faster where red-band DUoS exposure or solar surplus is high. We build the number from your half-hourly meter data and share the full spreadsheet so your finance team can stress-test it. We treat any frequency-response or Balancing Mechanism income as upside, not the foundation of the case.
How is a business battery maintained, and what does it cost to run?
Through a planned O&M contract: remote 24/7 monitoring with automated alerts, periodic electrical inspection, firmware updates, thermal-management checks, and cell-balancing oversight through the battery management system. Most clients sign a ten-year-plus O&M agreement aligned to the cell warranty. Software-led optimisation, choosing when to charge and discharge against tariffs and DUoS bands, is usually included so the system keeps capturing maximum value as prices move.