Glossary

Carbon dioxide equivalent (CO2E)

Measure used to compare the emissions of various greenhouse gases based on their global warming potential. Expressed in carbon dioxide (CO2), a primary greenhouse gas.

Criteria air contaminants

Group of common air pollutants reported to Canada's National Pollutant Release Inventory and released from sources across the country, including incineration, industrial production, fuel combustion and transportation vehicles.

Days away

Measure of any work-related injury or illness that prevents a worker from reporting to work on the next calendar day.

Fuel cell

Electrochemical device that combines hydrogen and oxygen to create electricity, heat and hot water for different residential, commercial and industrial applications.

Gate station

Point of entry for natural gas leaving the transmission system into the local distribution system.

Greenhouse gas emission intensity

Amount of greenhouse gas emissions per unit of energy delivered on energy transportation and distribution systems. Measures an operation's environmental efficiencies.

Indirect greenhouse gas emissions

Emissions released during electricity production for Enbridge's use.

Net emissions

Measure of the company's greenhouse gas impact on the global atmosphere after accounting for climate change actions.

Nitrogen oxides (NOx)

Nitrogen-based and oxygen-based compounds produced by combustion processes. NOx emissions contribute to acid rain and ground-level ozone (smog).

Polychlorinated biphenyls (PCBs)

Synthetic chemicals formerly used as insulating fluids in transformers and other electrical equipment. In various parts of our operation, such as our Liquids Pipelines System, we have removed PCB-containing electrical equipment to meet government regulations.

Regulatory notification

Formal written notification by regulators that Enbridge may not be adhering to the law, regulation or permit requirements. Examples of notifications include formal warnings, enforcement actions, summons and charges, notices of violation and stop and control orders. Notifications do not include field inspection reports or other informal communications. Notifications may result in fines or penalties, or may be rescinded.

Sulphur dioxide (SO2)

Gas formed by the burning of fossil fuels, including fuel oil and diesel fuel, that contain small amounts of sulphur. SO2 emissions can result in acidification of soils and lakes.

Total recordable injury frequency

Measure of work-related injuries per 200,000 hours worked. Includes days away and medical aid injuries.

Volatile organic compounds (VOCs)

Gases and vapors in hydrocarbon fuels. VOCs react with nitrogen oxides in sunlight to produce ground-level ozone (smog).