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Understanding your Hydro bill

Knowing how to read and interpret your Hydro Westmount invoice is an excellent way to monitor your exact usage of electricity and track how your conservation efforts can reduce your expenses. Click on each part of the invoice to view a detailed explanation of each component of the bill.


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  • Invoice
    A unique reference number assigned to this invoice.
  • Customer No.
    7-digit number you use to identify yourself whenever you contact Hydro Westmount.
  • Account No. 
    This number references your Hydro Westmount account file.
  • Reference No. for banking payments
    Use this 14-digit number when making payments through your financial institution or on line.

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  • Services provided to
    Name and address of the location where the electricity was consumed.
  • Meter No.
    Identification number of the HW meter assigned to the service location.
  • Readings – Current
    Reading in kilowatt-hours (kWh) at the time of the last meter reading.
  • Readings – Previous
    Reading in kilowatt-hours (kWh) at the time of the preceding meter reading.
  • Difference
    The difference between the two readings is the total amount of electricity in kilowatt-hours (kWh) consumed during the billing period.
  • Multiplier
    The multiplier is used to calculate the consumption of electricity based on the data collected by the meter. Because the meter records electricity consumption at a reduced speed, the multiplier that appears on the invoice is used to calculate the actual consumption. The multiplier for electrical service entrances of 200 amperes or less is 1.
  • Consumption
    This amount is your total consumption in kilowatt-hours (kWh) for the billing period. One kilowatt (kW) is 1,000 watts; this is how the This is the unit of measurement of the electricity made available to you by Hydro Westmount. A kilowatt-hour (kWh) is 1,000 watts consumed during one hour. This is the unit used to measure your consumption of electricity.

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  • Messages
    This space is used when needed for public service announcements related to electricity consumption.
  • Rate
    The rate is the category of tariff applied to your account. Based on usage rather than consumption, the rate is based on the type of usage of the power – domestic or commercial.
  • Fixed Charge
    This is your subscription fee. The fee is a fixed amount to be paid for the service, independent of your electricity consumption. This amount is applied on a monthly or daily basis, according to the tariffs in effect, and is prorated to the number of service days in the billing period. Your electricity consumption is determined by the meter readings. If the meter reading is not available, Hydro Westmount will estimate your consumption.
  • First 40 kWh per day
    The first 40 kWh of electricity consumed each day is billed at a rate of $0.06159 per kWh. In this case, the first 40 kWh consumed daily is multiplied by 59(the number of days in the billing period), or 2360 kWh.
  • Remaining Consumption
    The excess consumption daily, beyond the first 40 kWh, is billed at the rate of $0.09502 per kWh. In this case, the remaining consumption is calculated as: 2564 kWh (as indicated in the line Consumption), minus 2360 kWh (40 kWh x 59 days) = 204 kWh.

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  • Previous consumption
    This table provides your previous consumption amounts to help you determine increases or decreases in your consumption over a longer period. Please note that taxes have been excluded.

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  • Remittance stub
    Include this detachable section with your payment by mail or at your financial institution.