Submetering (often called suite metering) is the shift from "everyone pays a share" to "each suite pays for what it actually uses." In Ontario, that usually means a licensed Unit Sub-Meter Provider (USMP) installs metering equipment, reads usage, and produces bills for each suite, while the building continues to receive the bulk "principal" bill.
In a bulk-metered building, electricity is measured at one master meter and paid by the corporation or owner. Costs are typically recovered through common expenses or rent. Residents have limited visibility and little incentive to conserve.
In a submetered building, each suite's consumption is measured. Residents receive a suite-level bill based on their actual usage, plus applicable charges and fees. The building's bulk bill drops because a large portion of in-suite usage is now billed directly to the suites, while common area loads remain with the corporation or owner.
The OEB licenses USMPs and sets minimum conditions and standards in the Unit Sub-Metering Code (USM Code), last revised August 18, 2025. Billing-grade meters must meet Measurement Canada requirements for accuracy and suitability for billing.
When people pay for what they use, behavior changes. Residents often turn off lights and electronics more consistently, adjust thermostat settings (where applicable), reduce standby loads, and upgrade to more efficient appliances.
Ontario research has found significant average reductions after submetering, which is covered in our article on the Navigant study findings.
Submetering does not increase bills for everyone. It reallocates costs based on actual usage. Lower users often pay less than they previously subsidized through common expenses or rent. Higher users pay more because they use more.
Ontario has bill assistance programs, including OESP, which provides a monthly on-bill credit for eligible households.