Clear answer
Clear answer, explained.
Demand charges are set by the highest 15-minute interval each month and can represent a substantial fraction of the bill.
Battery storage discharges during short peak events to keep the metered demand below the threshold that sets the monthly bill, producing operating cost reductions independent of energy savings — and providing resilience for cold-chain, automation, and security systems.
Key points
What this means in practice.
- Large warehouses pay both energy charges (cents/kWh) and demand charges (dollars/kW of peak draw)
- Demand charges are set by the highest 15-minute interval each month — a single spike sets the monthly charge
- Battery storage discharges during short peak events to keep metered demand below the monthly threshold
- Demand charge reduction produces operating cost savings independent of energy consumption savings
- Battery storage also provides resilience for cold-chain, automation, and security systems during grid events
- The storage system is sized against the facility's demand profile — the size and duration of peaks driving the monthly charge
When this applies
Best-fit environments.
- Your warehouse electricity bill includes high demand charges and you want to understand how storage addresses them
- Your facility has cold-chain, automation, or security systems that require power continuity during grid events
- You want to understand whether storage makes financial sense for your facility before combining it with solar
- You are evaluating battery storage as a standalone investment — not necessarily alongside solar
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