General rate for large‑power customers

Rate LG applies to an annual contract whose minimum billing demand is 5,000 kilowatts or more, unless the contract is principally related to an industrial activity.

More information

This information has been simplified. For more details about Rate LG, consult Section 2 of Chapter 5 of the Electricity Rates [PDF 2.35 MB].

Other rates or rate options

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

Minimum billing demand (minimum demand)

The minimum amount of power that the customer must pay for each consumption period, regardless of electricity use. The threshold is set so that you pay your share of the costs Hydro-Québec incurs to meet your power needs at all times. The minimum billing demand is determined by the conditions of each rate, as indicated in the Electricity Rates.

  • For all rates except Rate L, the minimum billing demand is automatically determined based on the previous winter’s maximum power demand.
  • Rate L customers must set their own minimum billing demand, called “contract power,” based on the amount of electricity they expect to use.


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).


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).

  • 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).

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.

Winter period

Period from December 1 through March 31 of the next year, inclusive.

Monthly period

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