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> We estimate it would cost over $13 billion

So basically it's less than what the U.S. Federal Government spends in one day (FY2021 spending totalled $6.83tn). Unrealistic.

That's $13 billion for the hardware, and $1 million per day in electricity assuming a cost of $0.01/kWh

$13 billion is a drop in the bucket for governments. The have been passing Trillion dollar bills for some time.