EWRB: Toronto's Energy Reporting Rule, Explained for Brokers

Toronto's Energy and Water Reporting and Benchmarking (EWRB) law is the first major Canadian building performance standard. Here is what it requires today — and where it's headed.

Published 2026-03-31 · By ecoMetric · compliance

The Energy and Water Reporting and Benchmarking rule — EWRB — is the first major Building Performance framework in Canada, applying to commercial and institutional buildings in both Ontario (provincial) and the City of Toronto (municipal). It is currently a disclosure-only regime, but the structural foundation is in place for performance-based compliance rollout over the next decade.

For CRE brokers working Toronto, Ottawa, London, Mississauga, or any Ontario market with significant commercial inventory, EWRB fluency is now required. This guide explains what EWRB does today and what brokers should be watching for.

Two levels: Ontario and Toronto

There are actually two EWRB regimes operating in parallel:

• Ontario EWRB — provincial rule applying to large buildings across the entire province. Requires annual disclosure of energy and water use, but no performance-based penalty structure yet.
• Toronto Green Standard (TGS) + Toronto EWRB — municipal framework applying to Toronto-specific buildings. More aggressive reporting requirements and a clearer path to performance-based compliance.

Most Toronto buildings are subject to both. The reporting is partially coordinated but not identical.

Who is in scope

Ontario EWRB

Applies to buildings:

• Over 50,000 sq ft of gross floor area (currently), with phased expansion to smaller buildings under discussion.
• Primarily commercial, institutional, and multi-unit residential.
• Certain exemptions for government and specific building types.

Toronto EWRB

Applies to Toronto buildings that are:

• Over 50,000 sq ft.
• Covered under the Toronto Green Standard for new construction.

The size threshold has been tightening over time, with earlier triggers at 100,000 sq ft; further tightening to 20,000 sq ft is under active discussion.

What's required: annual disclosure

Buildings in scope must file an annual report including:

• Total floor area.
• Total annual energy use by fuel type (electricity, natural gas, steam, etc.).
• Total annual water use.
• Calculated ENERGY STAR Portfolio Manager score (where applicable).
• Carbon emissions derived from energy use.
• Property type breakdown.

Reports are submitted through the ENERGY STAR Portfolio Manager interface — the same tool used across US benchmarking. This is useful for portfolio owners with cross-border assets: one Portfolio Manager account supports multiple US and Canadian benchmarking disclosures.

The Toronto Green Standard

The Toronto Green Standard (TGS) is the design-and-construction side of Toronto's building performance framework. It applies to new construction and major renovation, not existing buildings directly. TGS requires new buildings to meet specific energy, emissions, water, and resilience standards.

Combined with EWRB, TGS + EWRB creates a two-track regime:

• New buildings must meet TGS design standards.
• Existing buildings must disclose under EWRB and eventually comply with performance targets.

Penalty structure (current)

Currently, EWRB penalties apply primarily to non-disclosure rather than performance. Ontario EWRB fines for missed reports range from $250 to $50,000 depending on building size and persistence of non-compliance.

There are not yet performance-based penalties (like LL97's $268/ton). However, the regulatory framework for adding them exists, and the City of Toronto has signaled intent to introduce performance targets starting in the late 2020s.

Where this is heading

Toronto has committed to net-zero emissions by 2040 — more aggressive than the 2050 target in NYC, Boston, and most other BPS cities. To achieve that, EWRB will need to evolve from disclosure to performance-based.

Indicators that performance-based compliance is coming:

• Toronto's 2040 net-zero roadmap explicitly calls for existing building performance standards.
• The City's TransformTO plan identifies building emissions as the largest single reduction opportunity.
• Active consultation is underway on specific building emission caps.
• Performance requirements for municipal buildings are already in place and ramping up.

The expected structure mirrors LL97 and BERDO: five-year compliance periods with tightening emission caps, alternative compliance payments for buildings that exceed caps, and net-zero by 2040.

Canadian specificities

Grid carbon intensity

Ontario's electricity grid is significantly lower carbon than most US grids due to heavy nuclear and hydro generation. A building that electrifies in Ontario realizes immediate emission reductions without waiting for grid decarbonization — a structural advantage over buildings in, say, Pennsylvania or Ohio.

Natural gas heating prevalence

Most Ontario commercial buildings use natural gas heating. Because gas combustion directly emits CO₂, gas-heated buildings are the primary target of any future performance-based EWRB. Heat pump conversion is the main compliance pathway.

Climate and heating dominance

Unlike moderate-climate BPS cities (DC, San Francisco), Ontario buildings have very high heating loads. This means the carbon cost of heating dominates emissions. Any EWRB performance standard will essentially be a heating-decarbonization standard in practice.

What this means for Toronto CRE deals

For Class A office (Financial District, King West, PATH network)

Most Class A Toronto office buildings are relatively well-positioned for current EWRB disclosure and likely future performance standards. However, central steam heating (common in older Class A) is a liability as performance targets tighten.

For Class B office

Similar pattern to NYC — gas-heated Class B built in the 1960s–1990s faces the largest future exposure. Owners would be smart to begin heat pump feasibility studies now, ahead of eventual performance targets.

For multifamily

Toronto has massive multi-residential inventory. Most older buildings use gas heating. The coming EWRB performance targets will heavily impact the aging rental tower stock.

For retail and industrial

Current exposure is modest because these building types are less heating-intensive. Future performance standards will still apply but with more manageable compliance paths.

Cross-border portfolio implications

Owners with US and Canadian assets now face a patchwork:

• NYC — LL97 (carbon-based, active penalties).
• Boston — BERDO 2.0 (carbon-based, active penalties).
• Toronto — EWRB (disclosure now, performance coming).
• DC — BEPS (ENERGY STAR-based, active penalties).

Portfolio-level benchmarking tools — including ecoMetric — have become essential for cross-border asset owners to track compliance trajectories across jurisdictions.

The Ontario Clean Water Act layer

EWRB integrates water reporting with energy reporting. This matters for:

• Buildings with cooling towers (water-intensive).
• Buildings with irrigation (primarily institutional campuses).
• Supermarkets and restaurants (food service water use).

The water component is less operationally significant today, but provincial water stress conversations are emerging, and future regulatory tightening on water use is plausible.

Practical broker workflow

When taking on a Toronto or Ontario listing:

1. Pull the building's EWRB disclosure history from Ontario's public data.
2. Calculate the building's EUI and ENERGY STAR score.
3. Compare against peer buildings in the same property type.
4. Flag any recent non-disclosure or reporting errors (which carry fines even under current rules).
5. Assess electrification readiness as a forward indicator for coming performance standards.

What the next 5 years will bring

• 2025–2027: Toronto-specific performance targets published in draft form.
• 2027–2029: First performance-based compliance period begins for Toronto buildings.
• 2028–2030: Ontario-wide performance standards follow Toronto's lead.
• 2030–2035: Expanded size scope (smaller buildings) and tighter targets.
• 2040: Toronto net-zero target (the entire framework is built to this milestone).

Brokers, owners, and lenders who build EWRB fluency now — before penalties bite — will have a substantial information advantage over those who wait. Canadian CRE has historically lagged US markets on building performance; that gap is closing rapidly, and the owners who notice first will allocate capital smarter.

Closing

EWRB today is disclosure. EWRB tomorrow is penalty. The window to build compliance trajectory is now, before 2030 targets land hard. Every Toronto listing, every Ontario refinance, every lease negotiation in 2026 should have EWRB on the checklist. It is how Canadian CRE is quietly catching up to the Boston and NYC standard — and where the next decade of capital planning will concentrate.