Closing a line doesn't make financial sense
Line A takes in revenue X and makes loss Y
NTA pays PSO at value Y (give or take %)
IE closes line A
IE loses revenue X and PSO Y
IE has to pay out redundancy
IE head office costs remain the same but now spread over fewer lines
Prior to the arrival of EC1370 and the NTA IE would be up Y - X - redundancy in year 1 and Y - X in year 2 (Assuming that the subsidy is greater than revenue)
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