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The scale uses the global warming potential unit, the carbon dioxide equivalent (CO 2 e), and the unit of electrical energy, the kilowatt hour (kWh). The goal of such assessments is to cover the full life of the source, from material and fuel mining through construction to operation and waste management.
An emission intensity (also carbon intensity or C.I.) is the emission rate of a given pollutant relative to the intensity of a specific activity, or an industrial production process; for example grams of carbon dioxide released per megajoule of energy produced, or the ratio of greenhouse gas emissions produced to gross domestic product (GDP).
In the context of GHG accounting, RECs are often used to adjust estimated Scope 2 emissions. In a typical case, a company would calculate its Scope 2 emissions using its electricity consumption and a grid emissions factor. Companies that purchase RECs can use them to lower the average emissions factors included in their inventories.
These tiers indicate which method of emissions calculations is used from the IPCC 1996 Guidelines. [12] Activity GHG IPCC Tier Method used to estimate emissions Public electricity and heat production: CO 2: 2: An emissions factor is applied to fuel consumption data from DUKES. Some data are also collected from individual point sources at ...
The emissions information in eGRID include carbon dioxide (CO 2), nitrogen oxides (NO x), sulfur dioxide (SO 2), mercury (Hg), methane (CH 4), nitrous oxide (N 2 O), and carbon dioxide equivalent (CO 2 e). CO 2, CH 4, and N 2 O are greenhouse gases (GHG) that contribute to global warming or climate change.
The Kaya identity is a mathematical identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).