I think in comparison to existing fossil fuels (price/ROI), in this WIki article they talk about how the drop of oil price meant funding for these types of proj

I think in comparison to existing fossil fuels (price/ROI), in this WIki article they talk about how the drop of oil price meant funding for these types of projects went away: https://en.wikipedia.org/wiki/High-altitude_wind_power https://en.wikipedia.org/wiki/High-altitude_wind_power