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 Rates for Business Customers  

Interruptible Electricity Options for medium-power customers

If you are a Rate M, G-9 or L customer and can exercise some load-shaving capability at Hydro-Québec's request, these options offer a great opportunity for you to save money on your winter electricity bill.

With the Interruptible Electricity Options, Hydro-Québec offers you credits in exchange for curtailing your electricity consumption at its request.

These options were developed to help balance electricity supply and demand in Québec. By limiting your power consumption, you contribute to better use of our collective resources. In return, Hydro-Québec pays you the equivalent of what it spends when it buys power on open markets.


Sign-up procedure

You must submit your request to Hydro-Québec, indicating your proposed interruptible power, before October 1.

You must commit to a base power not exceeding 80% of your average billing demand for the preceding winter period.

Conditions of application

Option I Option II
Advance notice – Weekdays: 2 hours 15:00
the preceding day
Advance notice – Weekends: 15:30
the preceding day
No notice for this option-
Maximum number of interruptions per day: 2 2
Minimum interval between 2 interruptions in the same day: 4 hours 6 hours
Maximum number of interruptions per period: 20 25
Duration of an interruption: 4–5 hours 4 hours
Maximum duration of interruptions per period: 100 hours 100 hours

Interruptions can occur:

  • Option I: at any time in the winter period;
  • Option II: between 06:00 and 10:00 or between 16:00 and 20:00, weekdays in the winter period, excluding statutory holidays.

Financial compensation

Option I

  • Fixed credit:
    $13.00 per kilowatt for the difference between the average hourly power during useable hours and the base power.
  • Variable credit:
    • 20.00¢ per kilowatthour of effective hourly interruptible power for each of the first 20 interruption hours;
    • 25.00¢ per kilowatthour of effective hourly interruptible power for each hour between the 21st and the 40th interruption hours inclusive; and
    • 30.00¢ per kilowatthour of effective hourly interruptible power for each of the 60 subsequent interruption hours.

Option II

  • Fixed credit:
    $9.10 per kilowatt for the difference between the average hourly power during useable hours and the base power.
  • Variable credit:
    20.00¢ per kilowatthour of effective hourly interruptible power for each interruption hour.

Examples of total credits (fixed and variable)

Interruption hours Option I
Total credit
Option II
Total credit
10 h 150¢/kWh 111¢/kWh
20 h 85¢/kWh 66¢/kWh
30 h 65¢/kWh 50¢/kWh
40 h 55¢/kWh 43¢/kWh
50 h 50¢/kWh 38¢/kWh
60 h 47¢/kWh 35¢/kWh
70 h 44¢/kWh 33¢/kWh
80 h 43¢/kWh 31¢/kWh
90 h 41¢/kWh 30¢/kWh
100 h 40¢/kWh 21¢/kWh

Overrun penalties

If you don’t honor the terms of your agreement, you will be subject to a penalty.


For more information

Get in touch with your commercial delegate.

You can also consult the Electricity Rates to find out more about Hydro-Québec's rates and rate options.


See also