The Three Layers of Home Energy Visibility
Residential energy monitoring can be understood at three levels of granularity, each requiring different hardware and offering different insights.
Utility Smart Meter Data
The smart meter installed by the utility records whole-home consumption at intervals ranging from 15 minutes to one hour, depending on the utility's Advanced Metering Infrastructure (AMI) deployment. In Ontario, BC Hydro territory, and much of Alberta, interval data is accessible to account holders through the utility's web portal. This data shows total consumption by time of day but cannot distinguish between individual circuits or appliances.
The Landis+Gyr Focus AXR-SD is among the meter models deployed by Hydro-Québec for residential accounts. Other utilities use Itron, Aclara, and Sensus meters depending on the province and the vintage of the AMI rollout. The communication protocols between meters and the grid — typically mesh radio or cellular — are utility-managed and not accessible to the homeowner directly.
Whole-Home Energy Monitors
A whole-home monitor installs at the electrical panel, using current transformers (CTs) clamped around the main service conductors. It measures total consumption at higher frequency than utility smart meters — often every second or every few seconds — and presents the data through an app or a local dashboard.
Products in this category available in Canada include the Emporia Vue 2, the Sense Energy Monitor, and the Efergy Engage Hub. The Emporia Vue 2 can monitor individual circuits if additional CTs are attached to breaker conductors inside the panel, effectively providing circuit-level data at lower cost than purpose-built circuit monitors.
Installation requires working inside the electrical panel. In Canada, electrical panel work is subject to provincial electrical codes. While clamping a CT around an existing conductor is generally low-risk, it involves opening the panel cover — work that some jurisdictions require be done by a licensed electrician. BC and Ontario have explicit requirements around who may perform electrical work; other provinces follow similar frameworks.
Circuit-Level and Plug-Level Monitors
Circuit-level monitoring measures consumption per individual breaker. Whole-home monitors with additional CT sensors can replicate this, as noted above. Dedicated circuit monitors designed for specific high-draw circuits (EV chargers, electric water heaters, HVAC equipment) offer pre-packaged solutions for common use cases.
Plug-level monitors — smart plugs with energy metering — measure consumption at individual outlets. These are most useful for quantifying specific appliances: understanding the standby draw of a television, the actual running cost of a chest freezer, or how much a desktop computer consumes during a work day. Devices such as the TP-Link Kasa EP25 provide this at relatively low cost per outlet and integrate with common home automation platforms.
Whole-home monitors cannot identify which appliance is drawing power without additional input. Some products use machine learning to infer appliance signatures from consumption waveforms, but the accuracy varies and typically requires several weeks of observation before patterns become reliable.
Smart Meter Data Access in Canadian Provinces
| Province | Utility | Interval Data Access |
|---|---|---|
| Ontario | Multiple (Hydro One, Toronto Hydro, etc.) | Available via Green Button download; 15-min intervals |
| British Columbia | BC Hydro | Available through MyHydro portal; hourly or 15-min data |
| Alberta | Various (ATCO Electric, FortisAlberta) | Available through utility portals; Green Button supported by some |
| Quebec | Hydro-Québec | Available via Mon profil portal; hourly data |
| Nova Scotia | Nova Scotia Power | Smart meter rollout ongoing; interval data availability varies |
Time-of-Use Pricing and Monitoring Value
Ontario introduced mandatory time-of-use (TOU) pricing for smart meter customers, with on-peak, mid-peak, and off-peak rate tiers that shift by season. Similar structures exist in other provinces. For households on TOU pricing, knowing when consumption occurs matters as much as knowing how much is consumed.
A whole-home monitor that logs second-by-second data allows retrospective review of which appliance cycles coincided with on-peak periods. Dishwashers, washing machines, and electric dryers are typically the most schedulable loads. HVAC systems are schedulable only within comfort constraints — running the heat pump on full during off-peak hours to pre-warm the house, then letting it coast through on-peak periods, is a documented strategy for reducing peak period costs.
Green Button Standard
The Green Button initiative — originally developed in the United States and adopted by several Canadian utilities — provides a standardized XML format for downloading interval energy data. It allows third-party applications to import consumption data without requiring access to the utility's proprietary systems.
Ontario utilities participating in the Green Button program allow customers to download CSV or XML files of their consumption history. Some utilities support Green Button Connect, which enables direct API access for authorized third-party apps. Natural Resources Canada has referenced Green Button as part of broader residential energy data access discussions.
Panel Monitoring: Practical Notes
Installing a whole-home monitor with circuit-level CTs requires planning. Key considerations for Canadian installations:
- Canadian panels typically use 240V split-phase service. A monitor must measure both legs to capture total consumption accurately. All major whole-home monitors designed for North American markets handle this.
- Space inside the panel for CT wires varies. Older panels with crowded wiring may not have room to route additional sensor cables cleanly.
- Some panels — particularly Federal Pacific Stab-Lok panels, which are found in older Canadian housing stock — present additional safety concerns that affect any panel work. These panels are associated with documented reliability issues and an electrician's assessment is advisable before opening them.
- The CT clamps on most monitors are split-core types, which can be installed without disconnecting wires. This simplifies installation but the process still involves opening the panel cover.