‘A Maryland energy company is planning to deliver 500 megawatts of power to the electrical grid from a giant hollow tower on the Arizona-Mexico border that would be the second-tallest structure ever built.’
via Massive Energy Skyscraper Proposed On U.S.-Mexico Border – Forbes.
and the followup story fills in some of the details:
‘How much would it cost to build a downdraft tower? $1 billion, plus $100 million to pipe the water in from the Sea of Cortez in Mexico. Additional money would be needed to build a desalination plant, but the company has not yet arrived at a number…’