Applying the GHG Protocol to Buildings Using the Utility Data You Already Have

Emissions accounting sounds technical, but the core of the GHG Protocol Corporate Standard is a single multiplication: activity data times an emission factor equals emissions. For a building, the activity data is energy consumed, and you already receive it every month on your utility bills. The hard part is not the math. It is getting the activity data out of the bills cleanly and picking the right factors.

This matters because the standard you are almost certainly being measured against points straight back to the GHG Protocol. Canada's CSDS 2 climate standard and the global IFRS S2 standard from the ISSB both require gross Scope 1, 2, and 3 emissions measured under the GHG Protocol. So learning to apply the Protocol to your buildings is not an academic exercise. It is the mechanism behind the disclosure.

This guide walks through the practical path: what counts as Scope 1 versus Scope 2 in a building, how to turn a utility bill into activity data, how to choose Canadian emission factors, and how the location-based and market-based methods for Scope 2 differ (and why you report both).

The GHG Protocol in one line

The elegance is that the same formula covers every commodity. Switch the units, switch the factor, and the method holds. The discipline is in the inputs: if the activity data is wrong or incomplete, no downstream sophistication saves the number.

What counts as Scope 1 versus Scope 2 in a building

The clean line: if you burn it on site, it is Scope 1. If you buy the energy already converted (electricity, steam, district heat or cooling), it is Scope 2. Refrigerants are the one that teams forget, and they can be significant because their global warming potentials are high.

Turning a utility bill into activity data

A bill is not activity data until you extract the right fields cleanly. For each account and meter you need:

• Consumption quantity in a consistent unit (kilowatt-hours, cubic metres, gigajoules, litres), separated from cost.
• The exact billing period, so usage lands in the correct reporting year and overlapping periods are handled correctly.
• The meter and account identity, so you can roll usage up by building and by portfolio without double counting.
• The commodity and, for electricity, the jurisdiction, because the emission factor depends on the province.
• Any estimated-versus-actual read flags, because estimated reads distort month-to-month comparisons.

This is exactly where manual processes break. Canadian utilities issue bills in dozens of layouts, demand charges and delivery charges get mistaken for consumption, and multi-meter accounts hide sub-totals. A number keyed wrong here propagates into every report downstream.

Location-based versus market-based Scope 2

The GHG Protocol Scope 2 Guidance requires companies to report electricity emissions two ways. This is dual reporting, not a choice between methods.

In practice the location-based number tells you the physical reality of your grid, and the market-based number reflects contractual instruments such as renewable energy certificates or a green supply contract. If you have bought no special instruments, your market-based figure defaults to the residual-mix or grid factor and the two numbers are similar. The Protocol asks for both so that contractual claims stay transparent and cannot quietly replace physical reality.

Choosing emission factors, Canada first

For a Canadian portfolio, factor selection is not a detail. Canada's national average grid intensity was about 100 grams of CO2e per kilowatt-hour in 2022, down 55 percent from 220 grams in 2005, but the national average hides enormous provincial variation. Hydro-dominated Quebec, Manitoba, and British Columbia are a tiny fraction of the intensity of grids that still burn fossil fuels. Using a national number where a provincial number applies can misstate a building's Scope 2 emissions by an order of magnitude.

• Electricity: use provincial grid factors from Environment and Climate Change Canada's National Inventory Report and the ECCC emission factors and reference values.
• Natural gas and fuels: use the fuel-specific factors published by ECCC, applied to consumption not cost.
• Match the vintage: use the factor for the reporting year, and keep older factors for restatement so prior-year numbers remain comparable.
• Document the source and version of every factor, because assurance providers will ask.

Common mistakes that corrupt the number

• Reading cost instead of consumption, so a rate change looks like an emissions change.
• Missing meters or accounts, which silently understates the footprint.
• Applying a national factor to a specific province, which can be wildly off.
• Ignoring estimated reads, so a true-up bill creates a phantom spike.
• Reporting only one Scope 2 method when the Protocol requires both.

How MartinAI helps

MartinAI reads utility bills across electricity, natural gas, water, steam, and fuels, in the many formats Canadian utilities use, and reasons over each bill to separate true consumption from delivery charges, demand charges, taxes, and adjustments. It captures the period, meter, account, and estimated-read flags, then validates the extracted figures against expected ranges so anomalies are caught before they enter your inventory.

From there, the clean activity data pairs with the correct Canadian emission factors by commodity, province, and year to produce Scope 1 and Scope 2 numbers, including both location-based and market-based Scope 2, with every figure traceable back to the source bill. That gives you a GHG Protocol calculation you can hand to an assurance provider without a week of spreadsheet archaeology first.

The takeaway

Applying the GHG Protocol to buildings is not complicated in theory: multiply energy consumed by the right factor, keep Scope 1 and Scope 2 separate, and report Scope 2 both ways. The difficulty is entirely in the inputs. Get clean activity data out of your bills and pair it with the correct provincial factors, and the disclosure numbers follow directly and defensibly.