After stockpiling gigawatts of wind turbines in 2016 to qualify projects for 100% production tax credit (PTC) value, US developers may have begun to lose a race against the clock if they want to have all of them in commercial operation as federal law requires by the end of 2020.

Without full-value PTC - an inflation-adjusted $24/MWh for electric power sent to the grid for the initial 10 years - many projects would not make economic sense and by extension, not obtain financing.