To read a commercial electric bill, separate the current charges into energy used in kilowatt-hours (kWh), billed demand in kilowatts (kW), and fixed charges, adjustments, and taxes. Start with the detailed electric-charge section and the rate schedule—not just the amount due—because your tariff determines which charges apply and how they are calculated. Two businesses can use the same number of kWh and still pay different amounts because of their demand, usage timing, and rate plans.
Commercial Electric Bill Charges: Energy vs. Demand vs. Fees
The following hypothetical U.S. example shows where to focus first. All amounts are in USD; the assumed rates are teaching inputs, not actual utility rates or national benchmarks.
| Charge group | What to find on the bill | Calculation in this example | Amount | What to verify |
|---|---|---|---|---|
| Energy | Consumption in kWh and energy rate in USD/kWh | 5,000 kWh × USD 0.12/kWh | USD 600.00 | Whether energy is billed at one rate or split by time period |
| Demand | Billed kW and demand rate in USD/kW | 20 kW × USD 15.00/kW | USD 300.00 | Whether billed demand equals this month’s measured peak |
| Fixed charge | Customer, basic, or service charge | USD 40.00 per billing month | USD 40.00 | Whether the charge is monthly or calculated per day |
| Usage-based adjustment | Rider or surcharge and its billing basis | 5,000 kWh × USD 0.005/kWh | USD 25.00 | Whether it is additional to, or already included in, another rate |
| Tax | Tax percentage and taxable charges | 5% × USD 965.00 | USD 48.25 | Which charges are taxable in the applicable jurisdiction |
| Current-period electric charges | Total for electricity during this billing period | Energy + demand + fixed charge + adjustment + tax | USD 1,013.25 | Whether the amount due also includes previous balances or other services |
These categories describe how to organize the bill, not a universal utility layout. For example, Southern California Edison distinguishes energy, demand, time-related demand, delivery, generation, and other charges; not every listed charge applies to every customer. A charge labeled “delivery” may contain fixed, kWh-based, or kW-based components, so classify it by its billing basis rather than its name alone.
Find the Rate Schedule Before Checking the Arithmetic
Your rate schedule is the rulebook for the bill. It identifies the applicable prices, seasonal periods, demand provisions, and other conditions. PG&E’s bill guide places the rate plan and billing dates in the “Details of Electric Charges” section, while its official tariff directory provides current and historical schedules. Before recalculating charges, record:
- The utility and any separate electricity supplier.
- The service address, service agreement, and meter being billed.
- The billing start and end dates.
- The rate schedule and any selected rate option.
- The season and time-of-use periods, if applicable. Match the tariff’s effective dates to the service dates on the bill. When checking an older bill, use the rates applicable to that billing period rather than automatically applying the latest posted rates. PG&E provides both current and historical rate information for this purpose. For a 2026 bill review, your local tariff remains the starting point. A national average or a rate from another utility can provide broad context, but it cannot reproduce charges governed by your account’s specific schedule.
Read kWh and kW as Different Measurements
Energy: How Much Electricity You Used
Kilowatt-hours measure energy consumed over time:
[ \text{Energy (kWh)}=\text{Power (kW)}\times\text{Operating time (hours)} ]
A constant 10 kW load operating for 2 hours uses 20 kWh. Energy charges apply a price per kWh to that consumption; on time-of-use plans, the price depends on when the energy was used. For a single-rate energy charge:
[ C_E=E\times r_E ]
For multiple time-of-use periods:
[ C_E=\sum_i E_i\times r_i ]
Here, (E_i) is the kWh assigned to each period and (r_i) is its applicable rate in USD/kWh. Verify each period separately before adding the energy charges. Multiplying all monthly kWh by the peak-period rate would not reproduce a bill that includes off-peak consumption.
Demand: The Power Level Used for Billing
Demand measures the rate of electricity use, rather than the total energy consumed. Utilities commonly determine it from an average over a specified interval: PG&E describes 15-minute intervals on its business time-of-use page, while Portland General Electric’s business guide describes a 30-minute period. Do not assume every utility uses the same interval. For illustration, 5 kWh consumed during a 15-minute interval represents an average demand of:
[ \frac{5\text{ kWh}}{15/60\text{ hour}}=20\text{ kW} ]
That becomes the monthly measured peak only if no applicable interval has a higher average. It does not automatically become the billed demand: a tariff may impose a minimum or a demand ratchet based on earlier peaks. Find the billing demand used on each charge line. For a straightforward kW-based charge:
[ C_D=D_B\times r_D ]
where (D_B) is billed demand in kW and (r_D) is the applicable demand rate in USD/kW. If the bill includes separate overall and time-related demand charges, check each billed quantity and rate independently. SCE explicitly distinguishes these demand-charge categories.
Collect the Inputs Needed to Recalculate the Bill
A bill check is easier when every quantity has a unit and every charge has a defined basis.
| Input | Unit or format | Where to obtain it | Why it matters |
|---|---|---|---|
| Billing dates and duration | Dates; days | Service details | Establishes the period being checked |
| Rate schedule and option | Tariff identifier | Bill and official tariff | Determines applicable billing rules |
| Energy consumption | kWh | Usage section | Basis for energy charges |
| Energy by time period | kWh per period | TOU usage breakdown | Needed when prices vary by usage time |
| Energy rates | USD/kWh | Charge lines and tariff | Converts consumption into cost |
| Measured maximum demand | kW | Demand details or interval data | Helps verify the recorded peak |
| Billed demand for each charge | kW, or another tariff-specified unit | Demand charge lines | May differ from measured demand |
| Demand rates | USD/kW, or matching tariff unit | Charge lines and tariff | Converts billed demand into cost |
| Fixed charges | USD/month or USD/day | Service-charge lines | Must be included even when usage falls |
| Riders and adjustments | Stated amount or rate basis | Bill and applicable schedules | Can increase or reduce current charges |
| Tax basis and rate | Taxable USD; percentage | Bill and applicable rules | Prevents applying tax to the wrong subtotal |
| Credits | USD | Credit and adjustment lines | Must be deducted without duplication |
| Meter multiplier, if applicable | Dimensionless factor | Meter details | Needed when displayed readings require scaling |
These inputs reflect the components identified in utility bill guides. Portland General Electric also explains meter multipliers, which can apply to metering installations using current transformers. Do not apply a meter multiplier twice. Establish whether the displayed consumption already includes it before multiplying readings yourself. For interval-billed accounts, a register-difference calculation may not be available; Portland General Electric explains that these accounts can instead be billed from usage within individual time periods.
Check a Commercial Electric Bill in Six Steps
- Identify the correct account and billing period. Use the service-level details, especially when a statement covers multiple meters or includes both electric and gas charges.
- Verify the rate schedule. Match the bill’s schedule and option to the official tariff applicable during the service period.
- Recalculate energy charges. Multiply each billed kWh quantity by its corresponding rate. Keep time-of-use periods and separately listed energy components distinct.
- Recalculate demand charges. Multiply each billed demand quantity by its corresponding rate. Check the tariff before substituting measured peak demand for billed demand.
- Add fixed charges, adjustments, and taxes; subtract credits. Follow each item’s stated billing basis. Avoid adding a charge again if it is already included in a combined rate.
- Reconcile current charges with the amount due. First match the current-period electric total. Then account separately for any previous balance, payments, other services, or account-level adjustments. This order keeps usage verification separate from account-balance reconciliation. Utility bill guides distinguish service details and electric charges from the statement’s broader payment information.
Worked Example: 5,000 kWh and 20 kW
Inputs and Assumptions
This is a hypothetical U.S. commercial account for one 30-day billing period. It is not a customer statement or an official rate example.
| Parameter | Assumed value |
|---|---|
| Energy consumption | 5,000 kWh |
| Energy rate | USD 0.12/kWh |
| Measured and billed demand | 20 kW |
| Demand rate | USD 15.00/kW |
| Fixed customer charge | USD 40.00 per billing month |
| Additional energy rider | USD 0.005/kWh |
| Tax | 5% of energy, demand, fixed charge, and rider |
| Rate structure | One energy rate and one demand charge |
| Other billing conditions | No ratchet, minimum-bill adjustment, credits, or previous balance |
The energy rate is assumed to include all energy components except the separately stated rider. The tax treatment is an example assumption, not a rule for any particular state or municipality.
Formula and Numerical Substitution
For these assumptions:
[ C_{\text{current}}=E r_E+D_B r_D+F+E r_R+T ]
where (F) is the fixed charge, (r_R) is the rider rate, and (T) is tax. Energy charge:
[ 5{,}000\text{ kWh}\times0.12\text{ USD/kWh}=600.00\text{ USD} ]
Demand charge:
[ 20\text{ kW}\times15.00\text{ USD/kW}=300.00\text{ USD} ]
Energy rider:
[ 5{,}000\text{ kWh}\times0.005\text{ USD/kWh}=25.00\text{ USD} ]
Pretax subtotal:
[ 600.00+300.00+40.00+25.00=965.00\text{ USD} ]
Tax:
[ 965.00\times0.05=48.25\text{ USD} ]
Current-period electric charges:
[ 965.00+48.25=1{,}013.25\text{ USD} ]
Interpret the Result
The example’s current electric charges are USD 1,013.25, including USD 300.00 for demand. Dividing the total by consumption gives an all-in effective cost:
[ \frac{1{,}013.25\text{ USD}}{5{,}000\text{ kWh}} =0.20265\text{ USD/kWh}
]
That is approximately 20.27 cents/kWh for this example. It is not the tariff’s energy rate of USD 0.12/kWh: it also spreads demand, fixed charges, the rider, and tax across the month’s consumption. You can use the Commercial Bill Calculator alongside this worksheet. Match its available inputs and assumptions to your bill, and verify any tariff-specific items separately rather than treating a simplified estimate as a complete utility billing model.
Compare Changes in Usage, Demand, and Timing
A useful bill review identifies which charge an operational change would affect. The following comparisons use the same hypothetical rates and tax assumptions as the worked example. They assume the stated billed demand is actually achieved and that no tariff minimum or ratchet changes the result.
| Scenario | Monthly energy | Billed demand | Current charges | Difference from baseline |
|---|---|---|---|---|
| Baseline | 5,000 kWh | 20 kW | USD 1,013.25 | USD 0.00 |
| Reduce consumption by 500 kWh; demand unchanged | 4,500 kWh | 20 kW | USD 947.63 | USD 65.62 lower |
| Reduce billed demand by 5 kW; consumption unchanged | 5,000 kWh | 15 kW | USD 934.50 | USD 78.75 lower |
Reducing kWh lowers the example’s energy charge and usage-based rider. Reducing billed kW lowers its demand charge. Real demand savings depend on the tariff: lowering one observed peak may not reduce the bill if another interval sets the maximum or a ratchet determines billed demand. Time shifting is a separate comparison. Moving consumption to a cheaper time-of-use period can reduce energy charges, but demand charges must still be evaluated under their own measurement windows. Use the actual schedule’s periods and rates rather than assuming “off-peak” operation always removes demand charges.
Common Errors That Make the Total Look Wrong
Monthly kWh divided by billing hours gives average power, not peak demand. In this example, (5{,}000 \div 720) is approximately 6.94 kW, but the assumed billed peak is 20 kW. Using 6.94 kW in the demand-charge calculation would understate the example bill. Other errors to check include:
- Treating every commercial account as demand-billed. Charge applicability depends on the rate schedule; SCE notes that not every business charge applies to every customer.
- Treating all fees as fixed. Riders and regulatory charges may depend on kWh, demand, percentages, or other tariff provisions.
- Double-counting generation or delivery. Determine whether rates are combined or separately billed. PG&E distinguishes bundled service from other service arrangements in its schedules.
- Assuming the measured peak is always the billed peak. Demand ratchets can carry earlier demand into later bills.
- Comparing only the final amount due. Separate current electricity charges from other statement components before evaluating usage or rate changes. Small differences can also arise when calculations use displayed, rounded quantities. Check the bill’s available precision and ask the utility to explain any remaining discrepancy rather than forcing the arithmetic to match.
Use Official Bill Samples and Tariffs to Verify the Layout
For an official commercial sample, Portland General Electric’s business bill guide provides numbered examples for Schedule 32 small-business accounts and Schedule 83 large commercial and industrial accounts in its Oregon service territory. Use those examples to practice locating charges without exposing a customer’s account information; their layout and rates do not establish the rules for another utility. For California examples, SCE’s business bill-components guide explains charge categories, and its bill-help page provides nonresidential time-of-use and nonresidential community-choice bill guides. PG&E’s tariff directory provides the schedules needed to verify its billing rules. A sample explains where to look. The applicable tariff explains what should be charged. Neither the hypothetical worksheet nor a calculator result replaces the utility’s billing determination, an electricity-supply contract, or jurisdiction-specific requirements.
Commercial Electric Bill Review Checklist
Use this checklist before accepting a bill comparison or estimating savings:
Confirm the service address, meter, and billing dates.
Match the rate schedule and option to the tariff effective during the billing period.
Check consumption totals and any time-of-use breakdown.
Confirm whether a meter multiplier has already been applied.
Distinguish measured demand from billed demand.
Recalculate every energy and demand line using matching units.
Include fixed charges, riders, taxes, adjustments, and credits.
Check for duplicate generation or delivery charges in your worksheet.
Separate current electric charges from the total amount due.
Request the utility’s calculation details or interval data for unexplained differences.
These checks turn a bill total into a traceable calculation: quantities, rates, billing conditions, and account adjustments can each be verified against the statement and its governing schedule.