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Tip · 04

kWh vs. kW: the two numbers on your bill

Your commercial bill probably shows two numbers that look alike: kWh and kW. They're not the same thing.

Feral Watt tip 04. kWh vs. kW. Usage (kWh), shown as an odometer: how much you used over the billing period, like miles driven. Demand (kW), shown as a speedometer: your peak, usually averaged over about 15 minutes, like top speed. A daily load curve spikes at 7 AM. On many commercial accounts, part of delivery is billed on demand.

The difference

kWh (usage) is how much electricity you used over the whole billing period.

kW (demand) is your peak, the most power you pulled at one time. It's usually averaged over a short window, like 15 minutes.

Think of it like a car. kWh is the miles you drove all month. kW is your top speed.

Why it matters

Why care? On many commercial accounts, the utility bills part of its delivery charge on demand.

So a short burst, like every big machine and AC unit starting at 7 AM, can set the demand number for the whole month.

What to look at

  1. Find both numbers on your bill.
  2. Check last year's history chart, if your bill has one, for months where demand jumps.
  3. If big equipment all starts at once, ask whether staggering it is practical. It can affect the demand number on your bill.

Questions about yours?

Call me. Your bill. Your usage. Your price.

There's no cost to you. The supplier pays me, and it's built into the rate.

Not cute. Correct.

Vee
Feral Watt
(346) 694-5454

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