GHG Protocol Alignment
Market-based emissions are calculated in accordance with the GHG Protocol and appropriately reflect the impacts of both onsite and offsite green power based on renewable energy certificate (REC) ownership.Performance Metrics
The following market-based emissions metrics are automatically calculated for the whole building any time data is updated for any applicable energy meter.| Whole Building Metric | Definition |
|---|---|
| Total (Market-based) Emissions | The sum of direct and indirect market-based emissions |
| Total (Market-based) Intensity | Total (Market-based) Emissions / Gross Floor Area |
| Indirect (Market-based) Emissions | Emissions from electricity and district energy sources accounting for all onsite and offsite green power |
| Direct Emissions | Emissions from fuels and energy sources burned onsite. These are the same as for location-based emissions. |
Emissions Factors
Market-based emissions calculations leverage the same underlying emissions factors that are used for location-based emissions. For select municipal markets, locally published emissions factors developed specifically for Building Performance Standards (BPS) are available to support more detailed market-based emissions analysis. These local market-based factors supplement national or eGRID-based factors and are currently available for New York City, Boston, and Seattle.Green Power
Market-based calculations account for both onsite and offsite green power, which is counted as zero-emissions electricity. To reflect this, electricity consumption is adjusted prior to calculating market-based emissions.Green Power Adjustments
- Total Electricity: Energy consumption associated with all onsite and grid electric meters, regardless of REC ownership status.
- Total Onsite Green Power: Electricity generated and used onsite for which RECs are owned.
- Total Offsite Green Power: The sum of all purchased and exported electricity and electricity generated onsite for which RECs are arbitraged.
MB-Adjusted Electricity: [Total Electricity] - [Onsite Green Power] - [Offsite Green Power]
Methodology
The methodology slightly differs from calculating location-based emissions because offsite green power is also included in the electricity adjustment.
1
All in-metric energy meters are collected
- Whole building performance metrics are driven by in-metric meters. Learn more.
2
Meter consumption is normalized into common units & calendar months
Consumption entries are broken down and reconstituted into monthly values for each meter.
3
Monthly consumption values are aggregated by energy subtype
Monthly consumption totals are calculated for each energy subtype by aggregating values across meters of the same subtype.
- e.g. total electricity consumption, total natural gas consumption
4
Electricity consumption totals are adjusted for green power
MB-Adjusted Electricity: [Total Electricity] - [Onsite Green Power] - [Offsite Green Power]
- Click here to learn more about green power.
5
Emissions values are calculated for each energy subtype
- Emissions factors are determined by the energy subtype and property location
- Monthly energy values are multiplied by the appropriate emissions factor
6
Emissions values are aggregated by emissions type
Monthly emissions values are aggregated by emissions type to calculate direct, indirect and total market-based monthly emissions metrics.
7
Monthly emissions values are aggregated over rolling 12-month periods
Monthly values are rolled up to provide annual market-based emissions metrics for every possible 12-month reporting period.
Tracking Performance Metrics
Users can analyze market-based emissions for properties and portfolios.Portfolio Level
- Portfolio → Portfolio Trends → Emissions
- Annual portfolio-level emissions metrics & trends
- Portfolio → Property Trends → Emissions (dropdown: market-based)
- Annual property-level emissions metrics & trends
Property Level
- Property → Annual Trends (toggle: market-based)
- Annual property-level emissions metrics & trends
EXCEL Reports
- Portfolio → Reports → Performance
- Portfolio Performance & Data Quality Report