Environmental GRI Performance Indicators
EN16 – Total direct and indirect GHG emissions by weight, and
EN17 – Other relevant indirect GHG emissions by weight.
Enbridge provides full details of our GHG management performance in the Summary of Performance Indicator tables included in this report. As a summary, however, the following three charts show Enbridge’s total direct and indirect 2006 Canadian emissions, our Canadian emissions from 1990 to 2008, and our total GHG footprint in 2006 (including our Gas Transportation business in the U.S. and our Canadian operations).
(1,445 kt/yr CO2 equivalent)
Vented emissions are released to the atmosphere by design or operational practice. The most common sources of these emissions are gas-operated devices that use natural gas as the supply medium, equipment blowdowns and purging activities in Enbridge's natural gas distribution operations.
Transportation emissions include the emissions from the operation of Enbridge-owned transportation equipment. Emissions from the use of employee-owned vehicles for Enbridge activities are counted as an indirect emissions source.
Stationary combustion emissions occur when fuels, predominantly natural gas, are burned as an energy source in Enbridge's operations.
Fugitive emissions include unintentional leaks from piping and associated equipment components and releases from third-party damages to the pipeline system.
Direct emissions come from sources that are owned or controlled by Enbridge. They include emissions from stationary combustion equipment, transportation (fleet vehicle operation), and vented and fugitive emissions from piping and associated equipment.
Indirect emissions are the GHG emissions associated with purchased electricity and other activities where the emission sources are not owned or controlled by Enbridge.
(direct emissions, 2043.5kt/yr)
We have reported calculation details for each of our Canadian business segments to the Canadian Standards Association (CSA) GHG Challenge Registry website. The CSA awarded Enbridge a gold-level evaluation for our 2007 update report, based on our 2006 data. Enbridge is currently preparing our 2008 update report, based on our 2007 data.
In late 2008, Enbridge expects to receive a report based on an independent third-party audit of our GHG emissions data-management system for our Canadian operations. In 2007 and early 2008, the auditor completed a GHG Inventory Gap Analysis Report, in which Enbridge data are compared with a standard inventory management checklist, as outlined in the World Business Council for Sustainable Development’s GHG Protocol.