A plain-language guide to what behind-the-meter battery storage does for a commercial property -- and the four questions that determine whether it makes financial sense for your site.
Battery storage for commercial properties has moved from pilot project to mainstream procurement decision. The economics have shifted: battery costs have fallen, electricity tariff complexity has increased, and the grid export income available to generators with managed storage has become a meaningful revenue stream. This is a guide to what the technology does and how to think about whether it fits your site.
A behind-the-meter battery sits between your electricity supply and your building's consumption. It charges when electricity is cheap or when your own generation exceeds your demand. It discharges when electricity is expensive or when your generation is insufficient. To your meter, it is invisible -- the difference between grid import with and without storage appears only in the volume and timing of what you draw.
The primary financial levers are three: demand charge reduction, time-of-use arbitrage, and export income management. The relative weight of each depends on your tariff structure and generation profile.
Commercial electricity tariffs in many markets include a demand charge -- a fee based on the highest 15-minute or 30-minute average power draw recorded during the billing period, regardless of total consumption. Demand charges can represent 30--50% of the total electricity bill for energy-intensive businesses.
A battery can reduce demand charges by discharging during periods of high consumption, clipping the peak before it registers on the meter. The discharge needs to be timed accurately -- which is why AI-managed storage, calibrated to the building's consumption pattern, is materially more effective than a manually configured system.
Time-of-use tariffs charge different rates for electricity at different times of day. Charging a battery when the rate is low and discharging when the rate is high captures the spread as a saving. On a commercial tariff with a meaningful peak/off-peak differential, this spread can be worth £500--£2,000 per year per 100 kWh of usable storage, depending on the tariff and the cycle frequency the battery chemistry supports.
For sites with on-site generation -- solar, wind, or both -- the battery controls the timing of grid export. Exporting when the grid tariff is highest, and storing surplus when the tariff is low, increases the value of the same generated energy. This is particularly relevant in markets with time-variable export tariffs, which describes both the UK Smart Export Guarantee and the emerging Swedish balancing market.
1. Do you have a demand charge on your electricity tariff? If yes, demand charge reduction is likely the primary value driver.
2. Is your tariff time-of-use variable? If yes, quantify the peak/off-peak spread and model the arbitrage value.
3. Do you have or plan on-site generation? If yes, storage is almost always beneficial; the sizing question is how much.
4. What is your annual electricity spend? The larger the spend, the larger the absolute saving from storage optimisation.
See also: Battery storage technology · Vertical wind technology · Contact HNordic