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This is the % of the on-site thermal sources. So for each row i: $$Percentage = 100 \times \frac{HeatGJ_{i}}{\sum_{j=1}^{7}HeatGJ_{j}}$$

You can see the source code here in OutputReportTabular.cc#L8320-L8341

This is the % of the on-site thermal sources. So for each row i: it's that row's Heat GJ / Total On-site Thermal Sources GJ.

$$Percentage = 100 \times \frac{HeatGJ_{i}}{\sum_{j=1}^{7}HeatGJ_{j}}$$\frac{HeatGJ_{i}}{\sum_{j=1}^{6}HeatGJ_{j}}

You can see the source code here in OutputReportTabular.cc#L8320-L8341

So logically in your case, since you have only one type of on-site thermal sources, it shows 100%.