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326 A COMPrEhENSIVE GUIdE TO SOlAr ENErGy SySTEMS
regulatory thresholds for small generators above which visibility is mandated. The values
are 50 MW in England and Wales, 30 MW in Southern Scotland, and 10 MW in the North
of Scotland.
For a view into the future, see Figs. 15.4 and 15.5 (Figs. 5.3 and 5.4 of reference [6]).
The results show the distribution of generation output from visible and invisible
sources for 2016/17 and the prediction for 2025/27 in the “Consumer Power” and “Slow
FIGURE 15.4 Generation output which is not visible; based on a slow progression scenario [6]. Used with permission
from the National Grid.
FIGURE 15.5 Generation output which is not visible; based on a consumer power scenario [6]. Used with permission
from the National Grid.
