What is The Grid Factor?

The Electricity Grid Displacement Factor (EGDF) or the grid factor measures how much carbon dioxide emissions are being produced by the electricity grid.

It’s like a score – higher means there is more electricity produced by fossil-fuels flowing through the grid than electricity produced by zero-emission power plants. We multiply this score by the amount of electricity your solar PV system produces in order to calculate the emissions reductions and turn them into carbon offsets. The Alberta Emission Offset System (AEOS) uses fixed scores that are updated every year.

So, if the EGDF is high, your solar electricity production reduces a high amount of carbon dioxide emissions and will result in more carbon offsets.

If it is lower, your solar electricity production reduces less emissions and will result in fewer carbon offsets.

However, if you sign up with Re(source), your solar PV system will use the grid factor during the year it becomes a part of Re(source) for its entire term until 2032. So, signing up sooner will result in significantly higher carbon offset payments.

The table below shows the published EGDF for the Alberta electric grid from 2024 to 2029.

Vintage
Electricity Grid Displacement Factor with line loss applied (tCO2e/MWh)

2024
0.5226

2025
0.4907

2026
0.4588

2027
0.4271

2028
0.3952

2029
0.3633

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