Bismarck, N.D. (AP) A North Dakota Regulatory Commission has moved to require for the first time that companies post bonds to cover the cost of turning a wind farm site back to its original state when a facility is shut down for good. Public Service Commissioner Julie Fedorchak says wind farms cover thousands of acres and can leave a large footprint. North Dakota law allows the commission to decide whether a wind energy project that has been operating more than 10 years should be required to file some form of financial guarantee to cover the cost of decommissioning and restoring the site. Brian Kalk is the chairman of the commission. He says it's important to ensure that land is reclaimed after a wind farm no longer operates.