Ontario municipalities, hospitals, universities, colleges, and school boards share a recurring chore: every year they have to account for how much energy their buildings use and how much they emit. The buildings are spread across many sites, served by different electricity distributors and gas utilities, and metered in ways that do not line up neatly. Pulling all of that together by the annual deadline is where a lot of staff time goes.
This guide covers what Ontario's broader public sector reporting rules ask for, why the data-gathering step is the hard part, and how a standardized approach to utility data reduces the manual work.
What Ontario's broader public sector has to report
Energy reporting for public agencies in Ontario runs through O. Reg. 25/23: Broader Public Sector: Energy Reporting and Conservation and Demand Management Plans, made under the Electricity Act, 1998. It replaced the earlier O. Reg. 507/18, which the province revoked to simplify and reduce duplicate reporting. Ontario's overview page, Broader public sector energy reporting, sets out the current requirements.
In broad strokes, covered organizations must:
- Report annual energy consumption and greenhouse gas emissions for their buildings, submitted by July 1 of each reporting year, according to Ontario's broader public sector energy reporting page.
- Report gross floor area and the operation type for each property that falls under a prescribed use.
- Submit the data through ENERGY STAR Portfolio Manager using ministry-provided credentials.
- Publish a Conservation and Demand Management plan and refresh it on the schedule the regulation sets.
The reported figures feed a public data set. Ontario publishes energy use and greenhouse gas emissions for the broader public sector as open data. Individual organizations describe their own process too; the City of Windsor's page on Ontario Regulation 25/23 is a good example of what this looks like on the ground.
Why the data-gathering step is the hard part
The reporting template is not the bottleneck. Collecting a clean, complete year of consumption for every meter is. A mid-sized municipality can operate hundreds of accounts: arenas, water and wastewater plants, offices, libraries, fleet depots, street lighting, and pumping stations. Those accounts sit with more than one utility, on more than one fuel, and the data shows up in more than one format.
Typical friction points include:
- Electricity and gas served by separate utilities, each with its own portal and its own export format.
- Accounts opening, closing, or changing as buildings are added, sold, or renovated during the year.
- Older or smaller sites where the only record is a PDF or paper bill, not a clean data feed.
- Manual re-keying into spreadsheets, which introduces errors that are hard to catch before the July deadline.
None of this is about the regulation being complicated. It is about the sheer number of sources and the effort to normalize them into one consistent set of numbers.
How Green Button changes the picture
Ontario's other energy data rule helps here. Under O. Reg. 633/21, electricity and gas utilities across the province offer Green Button, a standard format for consumption data. The Green Button Alliance has certified 55 Ontario utility platforms against the underlying NAESB ESPI standard.
For a public sector energy manager, that means the same building's electricity and gas data can be pulled in a common structure regardless of which certified utility serves it. Green Button offers two paths: Download My Data, a manual standardized export, and Connect My Data, an authorized ongoing API feed. The Green Button Ontario FAQ explains both. A standard format is what makes it realistic to gather many accounts without a bespoke process per utility.
A practical approach to gathering the data
A workable pattern for a municipality or agency looks like this:
- Build a complete inventory of accounts and meters, mapped to properties and their prescribed operation types.
- For accounts at certified utilities, use Green Button to collect consumption in a standard format rather than logging into each portal by hand.
- For sites where only bills exist, convert those bills into structured data so they line up with the Green Button records.
- Normalize everything to a common set of fields, then map it to the Portfolio Manager properties you report through.
- Keep the collection running through the year so the July deadline is a review step, not a scramble.
The aim is to turn reporting from an annual data hunt into a steady feed you check and submit.
Where a connector fits
This is the gap EZGB is designed to close for public sector portfolios. EZGB collects Green Button data across many utilities using both Download My Data and Connect My Data, so a municipality can gather electricity and gas consumption for hundreds of accounts through one connection instead of many portal logins. For the older or smaller sites where only a bill exists, EZGB turns those PDF bills into structured data, so those accounts do not fall out of the report. The output is a consistent data set you can align to your Portfolio Manager properties and reuse for internal tracking, not just the annual submission.
EZGB does not file your report or make any regulatory determination for you. Reporting obligations, deadlines, and what counts as a covered property are set by the regulation and Ontario's guidance, and your team owns those decisions. What a connector does is remove the most time-consuming part, which is assembling clean, complete consumption data across a large and varied portfolio, so staff can spend their time on conservation planning rather than data entry.
Two parts of the broader public sector run into their own versions of this problem. School boards are covered in school board energy management, and hospitals in utility data for hospitals and healthcare facilities.
The annual number a public agency reports is only as good as the data behind it. Ontario's Green Button regulation gave the public sector a common format to work with. Using it well, and filling the gaps with structured bill data, is how a municipality turns a yearly reporting deadline into a routine step.
Source: ontario.ca