Sioux Falls landfill tightens rules after Iowa dumps dozens of wind turbine blades Iowa wind-farms brought dozens of their old turbine blades to the Sioux Falls dump this summer. But City Hall says it won't take anymore unless owners take more steps to make the massive fiberglass pieces less space consuming. The wind energy industry isn't immune to cyclical replacement, with turbine blades needing to be replaced after a decade or two in use. That has wind energy producers looking