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 Rates for Large-Power Business Customers  

Interruptible Electricity Options for large-power customers

If you are a Rate L or Rate LG 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 these interruptible electricity options for Rate L and Rate LG customers, 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 a wiser 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.

Your interruptible power must be at least 3,000 kW, or 20% of the maximum contract power of the previous 12 consumption periods, whichever is higher.

Conditions of application

Option I Option II
Advance notice – Weekdays: 2 hours 2 hours
Advance notice – Weekends: 15:30
the preceding day
15:30
the preceding day
Maximum number of interruptions per day: 2 1
Minimum interval between 2 interruptions in the same day: 4 hours 16 hours
Maximum number of interruptions per period: 20 10
Duration of an interruption: 4–5 hours 4–5 hours
Maximum duration of interruptions per period: 100 hours 50 hours

Financial compensation

Option I

  • Fixed credit:
    $13.00 per kilowatt of .
  • 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:
    $6.50 per kilowatt of effective interruptible power.
  • Variable credit:
    20.00¢ per kilowatthour of effective hourly interruptible power for each interruption hour.

Examples of total credits (fixed and variable)

Hours interrupted Option I
Total credit
Option II
Total credit
10 h 150¢/kWh 85¢/kWh
20 h 85¢/kWh 53¢/kWh
30 h 65¢/kWh 42¢/kWh
40 h 55¢/kWh 36¢/kWh
50 h 50¢/kWh 33¢/kWh
60 h 47¢/kWh 31¢/kWh
70 h 44¢/kWh 29¢/kWh
80 h 43¢/kWh 28¢/kWh
90 h 41¢/kWh 27¢/kWh
100 h 40¢/kWh 27¢/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