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Demand Charge Decoder: What the Worst 15 Minutes Cost You.

Commercial bills price the single worst 15-minute interval of every month, and nobody has ever shown your customer that line as a yearly number. Type the twelve billed demands and the rate, and see what the peaks cost last year. Free, no sign-up, printable.

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FROM THE BILLINPUTS

Billed Demand, Last 12 Months (kW)

The demand line is billed kW, separate from kWh energy. If the bill has no kW line, the meter is not demand-metered and this charge does not apply to the account. Where the tariff bills kVA rather than kW, a poor power factor inflates the same charge, and the figure to type is the kVA one.

DEMAND COST SUMMARYAug 25, 2026
Site$18 / kW
Paid for peaks, last 12 months$21,510
Worst monthAug · 142 kW · $2,556
One extra 20 kW spike$360 that month
JFMAMJJASOND
Billed kWWorst month
$21,510 FOR PEAKS LAST YEAR

The bill prices the peak but cannot attribute it: attribution requires knowing which loads coincided inside the same 15-minute window, and that is per-load interval data. One Demand and Load Pattern Study names the loads; the sensors it leaves behind watch the next spike.

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Computed from the numbers you typed, at the flat $ per kW you entered. Tiered, seasonal and time-of-use rates vary, and a peak outside a coincident-demand window may not be billed at all. Read the exact charge from the tariff. © Wattif Inc.

The Bill Shows the Peak.
It Never Shows Which Loads Caused It.

Attribution needs per-load interval data inside the same 15-minute window. That is the Demand & Load Pattern Study, and the sensors it leaves behind are what Peak Demand Guard watches the next spike with.

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