Customers eligible for Rate G9

Rate G9 applies to any medium- or large‑power contract that is characterized by the limited use of power demand.

If you run equipment that uses a significant amount of electricity over short periods (e.g., golf course irrigation pumps, ski hill snow cannons, etc.) then your energy consumption may be relatively low and your load factor (LF) may be under 30%.

Rate G9 is different from the other base rates because it gives greater weight to energy than to power.

This information has been simplified. For more details about Rate G9, consult Section 2 of Chapter 4 of the Electricity Rates [PDF 4.83 MB].

We will be launching a pilot project on dynamic pricing for Rate G9 customers. If you would like more information about this Flex rate and whether it could apply to your business, please call us at 1 800 463‑99001 800 463‑9900 or write to us at

Structure of Rate G9

Billing for Rate G9 includes the following:

  • An amount for the energy in kilowatthours (kWh) consumed during the period in question.
  • An amount for the billing demand in kilowatts (kW).

Rate G9 is a monthly rate, which means the amount billed for power is based on a 30‑day period.

If applicable, the following may lower your bill:

Credit for supply at medium or high voltage

Hydro‑Québec’s rates assume that electricity will be supplied at low voltage. If you have equipment to step down the voltage of the electricity delivered to you or if you use electricity at medium or high voltage, that means reduced costs for Hydro‑Québec. In return, you receive a monthly credit on your demand charge. The credit is determined according to the supply voltage.

Adjustment for transformation losses

Hydro‑Québec bills you only for the electricity you use. This means it absorbs the transformation losses associated with electricity delivery. If metering occurs before transformation, the electricity billed will include energy lost during transformation that does not reach the customer. So that you do not pay for energy losses, Hydro‑Québec grants an adjustment on the billing demand.

The following may also be billed if your power factor is not optimal:

Charge for low power factor

Electrical equipment, whether yours or Hydro‑Québec’s, needs to operate at a relatively stable voltage. Hydro‑Québec’s rate structure is designed in such a way as to encourage large‑power customers to maintain a power factor of at least 95% at all times (90% for all other customers).

When Rate G9 customers make less than optimal use of the electricity provided and have a power factor below 90%, Hydro‑Québec is forced to supply them with additional power and handle the impacts on the power system.

The rate structure allows for Hydro‑Québec to bill the excess power to customers. For any difference between the maximum power demand and real power, a monthly charge of $10.485 per kilowatt (kW) is billed. This charge brings the cost associated with an insufficient factor to that which a Rate M customer pays. This provides all medium‑power customers with the same incentive to improve their load factor.

Learn more about your electricity rate

Rate G9 prices in effect

Breakdown of billing

  • Price of energy 10,211¢/kWh
  • Price of power $4.285/kW

Applicable in certain cases

  • Credit for supply at medium or high voltage
    • Voltage of 5 kV to less than 15 kV $0.6169/kW
    • Voltage of 15 kV to less than 50 kV $0.9888/kW
    • Voltage of 50 kV to less than 80 kV $2.2075/kW
    • Voltage of 80 kV to less than 170 kV $2.7004/kW
    • Voltage of 170 kV or more $3.5683/kW
  • Adjustment for transformation losses 17.902¢/kW 
  • Charge for low power factor $10.485/kW 

If little or no electricity is used, a minimum charge is billed. It is $12.490 per month (30 days) when single-phase electricity is delivered or $37.471 per month when three-phase electricity is delivered.

Rates in effect as of April 1, 2021. This table does not replace the Electricity Rates document in any way whatsoever.

Switching to a more advantageous rate

If you are currently a Rate G9 customer and you have improved your load factor (or are planning to do so), it may be more advantageous for you to switch to Rate M or another rate. Discuss your options with your commercial officer or designated agent. Our Business customer services can also be reached at the numbers in the Contact us section.

Comparison of bills calculated at Rate G9 and Rate M

The following table compares four customers with a billing demand of 140 kW, but different load factors.

Case Load factor Energy consumed
Billed at
Rate G9
Billed at
Rate M
Customer 1 10% 10,080 $1,629 $2,581
Customer 2 20% 20,160 $2,658 $3,095
Customer 3 30% 30,240 $3,688 $3,609
Customer 4 40% 40,320 $4,717 $4,122

Billing for a 30‑day consumption period with no discount for supply at medium or high voltage or adjustment for transformation losses (rates in effect April 1, 2021, excluding taxes).

Other rate options

If you have a Rate G9 contract, the following options may be of interest to you.

Power demand

Power a customer requires to meet energy needs at a given time. The higher the customer’s energy consumption at a given time, the higher the power demand.


Total amount of electricity supplied at a given time. Expressed in kilowatts (kW), power is the combined effect of voltage, expressed in kilovolts (kV), and current, expressed in amperes (A).


Power used by electrical equipment over a given period of time. Expressed in kilowatthours (kWh), energy is calculated as power, expressed in kilowatts (kW), multiplied by the time during which the power is used, expressed in hours (h).

Load factor (LF)

Relationship between the energy (in kilowatthours) actually consumed and the amount of energy that can be consumed by using the entire maximum power demand throughout the consumption period. The load factor indicates the utilization rate of maximum power demand for a given consumption period.

  • Low voltage: Voltage of 750 V or less.
  • Medium voltage: Voltage of more than 750 V, but less than 44 kV.
  • High voltage: Voltage of 44 kV or more.


Difference in electrical level between two points, expressed in volts (V).


Operation that involves increasing or decreasing voltage through a transformer.

Power factor

Ratio of real power (in kW) and apparent power (in kVA). The power factor is expressed as a percentage and indicates the efficiency with which the customer uses the electricity provided. Hydro-Québec encourages its customers to maintain a power factor of at least 90% or 95%, depending on their rate.

Maximum power demand

Maximum power measured during a consumption period. It is the higher of the following two values: real power in kilowatts (kW), or a percentage (90% for domestic rates and small- and medium-power rates, or 95% for large-power rates) of the apparent power in kilovoltamperes (kVA).

Real power

Amount of electricity consumed in a useful manner to operate equipment, such as a motor or a heating or lighting system. Real power is expressed in kilowatts (kW).

Monthly period

Period of 30 days, which may begin on any day of the month, established by Hydro-Québec for billing purposes.

Minimum charge (minimum monthly bill)

Minimum amount billable for electricity service even if little or no electricity has been used in the billing period.