Why It Could Take 125 Years to Pay for President Donald Trump’s 1,300 Mile Mexican Border Wall

The original estimate of the wall is $20 billion, but assuming the wall will be 40 feet high and span 1,300 miles, Johnson suspects covering the entire wall in photovoltaic panels will require 13.4 million panels, or 4.6 gigawatts, and cost an additional $7.6 billion– a 38% increase to the original $20 billion estimate –including a $6 billion project sales price and an additional $1.6 billion cost to the government for funding its 30% investment tax credit.

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