There are vast areas of undeveloped land which exist over underground abandoned coal mining that can be potentially used for wind farms. These land use areas can be economically feasible for this purpose even when accounting for any future land subsidence resulting from mine collapse. This feasibility depends on how much damage could occur, if any, and whether or not the damage element was repairable and not hazardous. Therefore important elements of the economic feasibility of a wind farm against mine subsidence are:
The resistance of the underlying mine structure to collapse across the project site. (i.e., more resistant leads to less mine collapse potential). See EU Issue #14 for mine subsidence risk as it relates to mine collapse.
Severity and extent of the surface subsidence across the project site.
The damage thresholds of the wind farm infrastructure to those predicted subsidence movements.
The extent and intensity of the damaged farm areas across the project site.
Moreover, based on the site specific conditions, the economics can be improved through Kaizen analysis and mitigation measures taken to reduce the expected level of damage. With cost-effective mitigation measures in place against mine subsidence risk, wind farms would be a viable land use over underground workings.
For more information contact aosouli@meacorporation.com.
