What a demand charge actually is
Most commercial and industrial tariffs in India bill you two ways: an energy charge (₹ per unit you consume) and a demand charge (₹ per kVA or kW of your highest measured draw in the billing cycle). The second one is easy to overlook — and it’s often a surprisingly large slice of the total.
Why it hurts more than you’d expect
Demand is usually measured on your peak interval — often a 15- or 30-minute window. A single spike, when several machines start together, can set the demand charge for the entire month, even if your average load is far lower. You end up paying for a moment, not an average.
If your load has sharp, short peaks — motor start-ups, compressors, welding — your demand charge is probably higher than it needs to be.
How storage shaves the peak
A battery system can discharge during those short peaks, so the meter never sees the full spike. The grid supplies your baseline; storage quietly covers the top. Over a month, that lowers your billed demand — the part of the bill you otherwise can’t touch just by “using less.”
It isn’t one-size-fits-all
Whether peak-shaving pays depends on your tariff structure, how spiky your load actually is, and your demand-charge rate. For some sites it’s the single biggest saving; for others it’s modest. The answer comes from looking at your real load profile and a recent bill — not a generic calculator.
What to do next
Bring us a recent bill and we’ll read your demand charges and load pattern during the assessment, then tell you plainly whether peak-shaving is worth it for your site.