Battery Storage for Businesses, Cut Peak Charges, Prove the Payback

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.

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.

Yes, when your bill carries enough peak and DUoS exposure to shave. Standalone peak shaving and demand-charge reduction stand on their own economics, and they are common on half-hourly-metered sites with spiky, predictable demand. Solar strengthens the case by adding self-consumption value, but it is not a precondition. We model the standalone case and the with-solar case side by side so you can see which streams drive the payback.

DUoS (Distribution Use of System) charges vary by time-of-day band, the red band, typically weekday late-afternoon into early evening, is far more expensive per kWh than green or amber. A battery charges in cheap periods and discharges across the red band and your demand peaks, cutting both the unit charges and the capacity-based standing charges. It also reduces exposure to the Capacity Market and residual charges. The saving is largest for sites with spiky, predictable demand.

Both, and they measure different things. Power (kW) is sized to the peak you need to shave or the load you need to support. Energy (kWh) is sized to how long that peak lasts. Most behind-the-meter commercial systems land at 1.5-2.5 hours of duration, for example 250 kW / 500 kWh. We pull at least twelve months of half-hourly meter data and model power and duration against your DUoS bands and solar surplus before recommending a size.

The old Triad regime, three winter-peak half-hours that set transmission charges, has been replaced by fixed banded residual charges, so classic Triad avoidance no longer exists in its old form. The value has shifted to DUoS red-band avoidance, demand-charge reduction, capacity-market exposure, and solar self-consumption, all of which a battery captures. We model the current charging structure, not the old Triad approach.