Thanks for all that, Gary.
I think my conclusion would be that there are many more factors which can (and do regularly), result in failure of power grids (other than GIC events).
'Trial runs' or practising turning off the power grid will come at a huge cost, and one would have to carefully balance the true benefit of doing this, against the cost, and a realistic view of the risk of random detrimental events.
Passing legislation seems like a first step. Without emergency legislation, pro-active management is not possible.
Cheers
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