How to Read a Business Electricity Bill

The three parts of the total

Almost every business electricity bill resolves into three components: the energy you consumed, the charge for the daily supply of electricity to your site, and the network charges for transporting that electricity to you.

The energy component is what retailers compete on. The daily supply charge is a fixed amount per day regardless of how much you use. Network charges are set by the business that owns the poles and wires and are passed through by every retailer that serves your site.

Because network charges and the daily supply charge are largely fixed for a given site, the room a retailer has to compete is concentrated in the energy rates — which is why the same usage profile produces different totals on different plans.

Usage: kWh, and why the shape matters

Usage is measured in kilowatt hours (kWh). A bill that shows only a total for the period can be compared on that total, but a bill that shows a breakdown by time band — peak, off-peak, shoulder — supports a much more accurate comparison, because many plans price those bands differently.

If your bill shows intervals or a peak/off-peak split, that structure is worth preserving. Collapsing it to a single total discards exactly the information that distinguishes one plan from another.

Demand: the line people miss

Larger business sites are often charged for demand — a measure of the maximum rate at which you draw power (in kilowatts, kW), typically taken over a short interval or averaged across the billing period. Demand is a capacity charge: it reflects how hard your connection is worked at its busiest, not how much energy you used in total.

A site with steady, moderate load and a site with occasional spikes can use identical total energy and pay very different demand charges. If your bill has a demand line, it belongs in the comparison — a plan compared on energy alone can be misleading for a site with peaky load.

The lines that tell you the comparison is valid

Two details confirm that a comparison is being run against the right inputs: the network tariff code, and the metering configuration. The network tariff determines how network charges are calculated for your site; the metering configuration determines what data is available to bill you accurately.

If either changes — because the site is upgraded, or a new meter is installed — the comparison should be re-run. A plan that was the best fit under the old tariff is not automatically the best fit under the new one.

Reading a bill for the first time

Start with the billing period, because every figure on the bill relates to it and annualising a short period multiplies any irregularity in it. Then find the total, then work backwards through the components: energy, supply, network, and demand if present.

Once you can see those parts, you have what you need to compare plans on your own numbers rather than on an advertised headline rate.