Tall towers allow turbines to reach stronger winds, dramatically increasing energy capture, lowering the cost of energy, and expanding the regions where wind projects can be profitably developed.
Today, towers must stay below 14 feet (4.3m) in diameter in order to be shipped to the project site. Because of this constraint, towers taller than 80m become very difficult to design and expensive to produce.
By shipping steel as flat sheets, and fabricating towers at the wind project, Keystone can produce towers in excess of 7m in diameter. These large diameters enable low-cost welded steel towers to reach hub-heights in excess of 140m.