Is a Home Energy Monitor Worth It in Ontario? Monitors, Smart Plugs and Free Data

Is a home energy monitor worth it in Ontario? It is if you will use the data to change habits or find problems, but most households should start with the free hourly data from their smart meter. Almost every Ontario home has a smart meter that records hourly electricity use, and a simple plug-in meter or energy-monitoring smart plug fills in appliance-level detail for under $40.

This guide compares the options from free to several hundred dollars, explains what each can and cannot tell you, and covers safe installation.

Start with free smart meter data

Your local distribution company (Hydro One, Toronto Hydro, Alectra, Hydro Ottawa and others) collects hourly readings from your smart meter. Most offer an online portal or app showing:

• daily and hourly use, usually with a one-day delay;
• how much of your use falls into each Time-of-Use or Ultra-Low Overnight period;
• comparisons with past months and seasons.

Many utilities also support Green Button, a standard format that lets you download your data or connect it to third-party apps. Our Green Button energy data guide explains how.

What to look for in hourly data:

1. Your baseline. Find the lowest hourly reading between 2 a.m. and 5 a.m. That is roughly your always-on load. If it is above 300–400 W (0.3–0.4 kWh per hour) in a home without electric heat, there may be savings in standby power, an old fridge or a dehumidifier.
2. Peaks. Spikes in on-peak hours show what could be shifted.
3. Seasonal jumps. A large summer or winter increase points to cooling, heating or a pool or hot tub.

To check whether a different price plan suits your pattern, try our electricity price plan calculator.

Monitoring options compared

Option	Typical cost (estimate)	What it shows	Best for
Utility portal / Green Button	Free	Whole-home hourly use	Everyone; finding baseline and peaks
Plug-in power meter	$20–$40	One appliance's watts and kWh	Checking old fridges, freezers, electronics
Smart plug with energy monitoring	$15–$35 each	One device, remote control and scheduling	Shifting loads, cutting standby power
Whole-home clamp-on monitor	$150–$400 plus install	Real-time total use, sometimes appliance guesses	Seeing live use, homes with EVs or heat pumps
Circuit-level monitor	$250–$600 plus install	Use per circuit	Detailed troubleshooting, larger homes
Smart electrical panel	Several thousand dollars installed	Circuit monitoring and control	Mainly when replacing a panel anyway

Installation by an electrician for an in-panel monitor typically adds roughly $150–$400, depending on access and travel.

Plug-in meters: the best first purchase

A plug-in power meter sits between the outlet and an appliance. Leave it on a fridge or freezer for a week, multiply the kWh reading by 52, and you have a good estimate of annual use. Then use our appliance energy cost calculator to put a dollar figure on it.

Good things to test:

• second fridges and chest freezers in the basement or garage;
• dehumidifiers in summer;
• entertainment centres and computer setups, both on and "off";
• aquariums, waterbed heaters, heated towel racks and similar always-on items.

Plug-in meters are rated for standard 120 V, 15 A outlets. They cannot measure 240 V appliances such as dryers, ranges, water heaters or heat pumps.

Smart plugs: control, not just measurement

Energy-monitoring smart plugs let you switch devices remotely and set schedules. Useful applications:

• Cutting standby loads: switch off a TV, game console and sound bar together overnight. Our standby power guide estimates what that is worth.
• Shifting flexible loads: run a dehumidifier or a block heater on a schedule that avoids on-peak hours.
• Seasonal timers: holiday lights, outdoor fountains.

Caution: Do not use a smart plug to control a portable space heater, window air conditioner or other high-draw appliance unless the plug is specifically rated for that load. Space heaters draw close to the 15 A limit of a standard plug, and many space heater makers warn against using them with timers or extension devices. Overheated plugs and outlets are a real fire risk.

Each smart plug draws a small amount of power itself, often about 0.5–1 W. Using one to switch off a device that only draws 1 W in standby saves nothing.

Is a home energy monitor worth it? Who benefits from whole-home monitoring

A whole-home monitor uses current sensors clamped around the main service wires inside your panel and reports real-time use to an app, typically every second or two. Some try to identify individual appliances by their electrical signature; accuracy varies and is best for large, distinct loads like a dryer, well pump or EV charger.

They tend to be most useful for:

• homes with a heat pump, where you can see when backup resistance heat kicks in;
• EV owners checking that charging happens in off-peak or ultra-low overnight hours;
• homes with solar, to compare production and use (many inverters already provide this);
• people troubleshooting an unexplained high bill.

If you would look at the app for two weeks and then forget it, the free utility data is probably enough.

Installation and safety

Clamp-on monitors are installed inside the electrical panel, near live service conductors that cannot be switched off by the main breaker. In Ontario, electrical work generally requires a notification of work (permit) through the Electrical Safety Authority. Hiring a Licensed Electrical Contractor, who takes out the permit, is the safe choice. You can verify a contractor's licence through ESA (opens in a new tab).

How much can monitoring actually save?

Monitoring saves energy only if it changes something. Studies of real-time feedback have often found savings of a few percent, mostly from habits and from finding forgotten always-on loads. For a home using 700 kWh a month, a 3–5% reduction is roughly 250–420 kWh a year, or about $40–$65 at an illustrative 15¢/kWh.

The bigger value is often diagnostic: finding a failing freezer, a sump pump that cycles constantly, a heat pump running on backup heat, or a hot tub with a poor cover. Our hydro bill estimator can help you check whether your bill matches your expected use.

Checklist: getting value from your data

1. Log in to your utility portal and note your overnight baseline.
2. Compare a typical weekday with a weekend day.
3. Test the three oldest plug-in appliances with a plug-in meter.
4. Use smart plugs to schedule or switch off clusters of standby devices.
5. Recheck your baseline a month later to confirm the change.
6. Consider a whole-home monitor only if you have big electric loads to manage.

Frequently asked questions

Can I see my electricity use in real time without buying anything?

Usually not in real time. Utility portals typically show hourly data with about a one-day delay. Real-time views need a whole-home monitor or a compatible in-home display.

Are whole-home monitors accurate?

For total consumption, good ones are generally close to your meter. Appliance-level detection is less reliable, especially for small or variable loads.

Do energy monitors share my data?

Many cloud-connected devices send data to the manufacturer. Read the privacy policy, and check whether the device works locally if the company stops supporting it.

Is it worth monitoring gas use?

Enbridge meters are read less often, so detailed gas data is limited. A smart thermostat's runtime reports are the most practical proxy for furnace use.