Clear answer, explained.
When multiple EVs charge simultaneously, the combined power draw can spike the 15-minute demand interval that sets the monthly demand charge on Ontario commercial electricity tariffs. A battery storage system positioned at the facility level monitors load continuously and discharges when EV charging pushes consumption toward the demand threshold.
This configuration allows facilities to expand EV charging capacity beyond what the electrical service would otherwise support for demand charge purposes, without triggering higher monthly charges. The battery charges during off-peak periods — from the grid or from onsite solar — and is available to support EV loads whenever demand management is needed. Battery management software coordinates both functions automatically based on real-time load data and tariff schedules.
In Ontario, where demand charges can represent a significant portion of commercial and industrial electricity bills, the combination of battery storage and EV charging is often the most cost-effective approach to fleet electrification at high-consumption facilities. For facilities also qualifying under the IESO Industrial Conservation Initiative, battery storage for demand management during EV charging events can reduce Global Adjustment exposure in addition to LDC demand charges.
What this means in practice.
- Battery monitors load and discharges during EV charging peaks
- Prevents demand spikes from being recorded on the meter
- Enables more EV capacity without triggering higher demand charges
- Battery charges off-peak from grid or solar
- Software coordinates demand management automatically
- ICI participants can reduce Global Adjustment exposure too
Best-fit environments.
- High-consumption commercial facilities with large EV fleets
- Industrial sites where EV charging competes with production loads
- Facilities already using battery storage for solar self-consumption
- Properties seeking to expand EV capacity without service upgrades
