On April 1, 2018, the Régie de l’énergie approved a decrease in Rate DT electricity prices. This means you’ll save even more with your dual-energy system in comparison with Rate D.
A dual-energy heating system uses two energy sources: electricity and fuel, usually oil.
The fuel is used as an auxiliary energy source of heat instead of electricity when it is really cold, which is when the Hydro‑Québec power grid is under the greatest pressure.
Dual energy is advantageous for residential customers who have a dual-energy heating system, for those who do not have them, and for Hydro‑Québec itself.
This is because a dual-energy heating system lowers the demand for power in peak periods, which are generally winter cold spells. This gives Hydro‑Québec some leeway concerning the amount of electricity it has available to meet Québec customers’ higher demand for power at those times and makes it easier to balance high electricity demand with availability.
Customers with dual-energy heating systems have the additional advantage of Rate DT, which is overall cheaper for them.
This rate has two prices that apply at different temperatures. An indicator light shows what price you’re being billed for your electricity. When the outdoor temperature is greater than or equal to −12°C or −15°C (depending on where you live), electricity is billed at the lower price and it is less expensive to heat using electricity. When the outdoor temperature goes below −12°C or −15°C (depending on where you live), electricity will be billed at the higher price and it is to your advantage to heat your home using fuel, such as oil.
Various elements are required to make a dual-energy heating system eligible for Rate DT. It must automatically switch from one source to the other when it receives a signal from the outdoor temperature sensor, usually built into Hydro‑Québec’s meter. An indicator light goes off when the lower Rate DT price applies to your electricity consumption, and goes on when the higher price applies.
This light, installed in your house, preferably in plain view, will help you better manage your use of electricity.
It shows you which type of energy is being used for heating and so which price applies to your electricity consumption.
When the light is off, the heating system is running on electricity and you will be billed at the lower price.
When the light is on, the heating system is running on fuel, because the outdoor temperature is below the threshold (−12°C or −15°C, as applicable). You will be billed at the higher price.
The dual-energy system requires a special meter that records electricity consumption at the two different prices.
There are two lights on the meter housing:
The outdoor sensor sends a signal to the heating system when the temperature drops below −12°C or −15°C (depending on your climate zone).
Manual switch you can use to choose whether your heating system runs on fuel, dual energy or electricity.
To take advantage of Rate DT, you need to set the mode selection switch to dual energy. Depending on the outdoor temperature, the system automatically switches from electricity to fuel or vice-versa, whichever is more economical.
Rate DT is more advantageous, except in extremely cold weather, i.e., when the temperature is below the threshold (−12°C or −15°C, depending on the region). But we only have those extreme cold spells a few days a year, so Rate DT is overall cheaper for dual-energy customers who use the right energy source at the right time.
(effective April 1, 2018)
|Rate D||Dual-energy Rate DT|
|Energy consumed up to 36 kWh times the number of days in the consumption period: 5.91¢/kWh||Temperature above or equal to −12°C or −15°C (depending on region): 4.37¢/kWh|
|Remaining energy: 9.12¢/kWh||Temperature below −12°C or −15°C (depending on region): 25.55¢/kWh|
In either case, the fixed charge of 40.64¢/day applies.
Look at this comparison of average energy costs for a 158 m2 (about 1,700 sq. ft.) single-family home with four occupants in Montréal.
|Rate D||Electricity: $2,020||$2,020|
|Rate DT||Electricity: $1,313
Oil*: + $212
|Annual savings: $495|
* Estimated cost of oil: $0.89/L, based on the average for the 2017-2018 season (August 2017 to March 2018). Source: Régie de l’énergie, Relevé hebdomadaire des prix du mazout léger, week of March 12, 2018.
Annual consumption for heating and hot water, and other basic uses.
Annual consumption of 24,963 kWh.
Electricity – Rate D: 5.91¢/kWh for 12,616 kWh (1st tier) and 9.12¢/kWh for 12,347 kWh (2nd tier).
Dual-energy – Rate DT: 4.37¢/kWh for 22,021 kWh when the temperature is above or equal to –12°C or –15°C, 25.55¢/kWh for 791 kWh when the temperature is below –12°C or –15°C, and an estimated cost of $0.89/L for 266 L of oil.
Electricity bills (at Rate D and Rate DT) include the fixed charge of 40.64¢ per day.
The most important thing is to use the more economical energy source, based on the outdoor temperature and the price billed.
Use the appropriate energy source to heat your home.
|Outdoor temperature||Above or equal to –12°C or –15°C (depending on where you live)||Below –12°C or –15°C (depending on where you live)|
|Price of energy at Rate DT effective April 1, 2018||4.37¢/kWh||25.55¢/kWh|
|Energy to use for heating*||Electricity||Oil|
* Given an estimated cost of oil: $0.89/L, based on the average price in Montréal for the period from August 2017 to March 2018. Source: Régie de l’énergie, Relevé hebdomadaire des prix du mazout léger, week of March 12, 2018.
Just make good use of your dual-energy system.
Hydro‑Québec has more info on how to use less electricity.
Enjoy summer to the max for less!
Do you use an air conditioner or a pool heater? With Rate DT, you’ll also save on energy costs for equipment that operates at full capacity during summer.
Electricity prices at Rate DT vary with the temperature. Discover how.
Rates in effect April 1, 2018. Under no circumstances shall this table replace the Electricity Rates.
Rates generally have three main components that reflect the actual costs incurred by Hydro‑Québec to provide electrical service.
The fixed charge, expressed in cents per day for this rate, is a set amount to be paid for the electricity service itself.
As the amount of energy consumed varies, the amount billed varies as well.
Hydro‑Québec must be able to meet its customers’ maximum power demand at all times. Even if power demand is variable and consumption is sometimes minimal, Hydro‑Québec’s rates still have to cover the cost of operating and maintaining the power system. For this reason, it’s important that rates for large electricity consumers include billing for maximum power demand. This reflects the costs associated with meeting power demands of varying size and duration.
Power demand is another component of your electricity bill. Discover how it factors in.
If the power demand exceeds 50 kW (or 4 kW times the multiplier), the demand charge is applied to the greater of these two billing demand values:
For Rate DT, the minimum billing demand is set at 65% of the maximum power demand during a consumption period that falls wholly within the winter period included in the 12 consecutive monthly periods ending with the consumption period in question.
First ask a heating contractor to check that your dual-energy system complies with the provisions of the Electricity Rates concerning dual energy and Rate DT.
Then have the contractor fill out a Certificate of eligibility – Dual Energy form [PDF 638 Kb].
Sign the certificate to confirm that you would like to sign up for Rate DT and send it to the address shown on the form.
Note: You will have to pay for an inspection of your dual-energy system, making it qualify for Rate DT, if necessary, and the installation of the indicator light, supplied free of charge by Hydro‑Québec, which will tell you when the higher price applies.
To find out more, call Hydro‑Québec customer services.
If so, your contract is no longer eligible for Rate DT. It’s important that you contact us without delay so we can switch you to another rate.
N.B. The new light is built into the box. Do not try to remove it. Install the entire box.
No, you don’t. Some systems do have a manual switch as well as the automatic one, but it’s completely optional. Many dual-energy systems without a manual switch have a heat pump as the electric component.
If one of the components (electric of fuel) of the dual-energy system stops working properly, you can use manual mode to continue heating with the other one.
Be sure the switch is set to dual-energy mode so that your dual-energy system switches between energy sources automatically. Hydro‑Québec does not recommend manual switching. If you decide to switch your heating system’s energy source manually, we advise you to switch to fuel mode as soon as the temperature goes below −12 °C or −15 °C (depending on the region). It will cost you less to heat with fuel, because you’ll be billed for electricity at the higher price.
No. Although oil is the auxiliary energy source most commonly used by Rate DT customers, a compliant dual-energy system can use another type of fuel, such as natural gas or propane.
Yes, generally speaking, savings at Rate DT over a period of 20 years will cover all the extra costs of replacing your entire dual-energy system, compared with buying an electric system. The extra costs can also be absorbed more quickly if you realize additional savings related to summer uses of electricity (air-conditioning, pool heater).
Furthermore, you are more likely to allocate the cost of replacing the main parts or your dual-energy system over several years as part of regular maintenance, rather than replacing the entire system at once.
Under Rate DT, a multiplier is applied to the fixed charge and the base billing demand.
The multiplier is generally equal to 1, except when there is bulk metering that includes the consumption of the dual-energy system and when the contract was subject to Rate DT or eligible for Rate DM on May 31, 2009.
If the multiplier is not equal to 1, it is determined by the type of residence, as follows:
To find out more about Rate DT, consult Section 5 of Chapter 2 of the Electricity Rates [PDF 4.54 Mb], approved by the Régie de l’énergie.
Estimated cost of oil: $0.89/L.
Net savings of approximately $374 if annual system maintenance costs apply.
Electricity Rate D
Consumption billed at Rate D second-tier price as at April 1, 2018 (applicable to consumption over and above 36 kWh times the number of days in the consumption period).
Dual-energy Rate DT
Consumption billed at lowest Rate DT price as at April 1, 2018.
A set amount, expressed in dollars per month or cents per day depending on the rate, to be paid for the electricity service itself.
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).
Rates in effect April 1, 2018.
Period from April 1 through November 30, inclusive.
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.
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).
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).
Amount of electricity that Hydro-Québec supplies to a customer, expressed in kilovoltamperes (kVA). When it is used, apparent power breaks down into real power (kW), which runs devices, and reactive power (kVAR), which produces magnetic fields and which is not useful power for the customer.
Period from December 1 through March 31 of the next year, inclusive.