ENA DOC 047-2022

The document provides a basic overview of the risks associated with WTGs in close proximity to electricity lines. It provides information on the failure modes and approximate failure rates of WTGs based on historical performance. In particular, the two failure modes which could have consequences for nearby electricity lines: wind turbine structure collapse and blade impact (following a blade detachment event), have been studied in greater detail.
Information is also provided in regard to the other consequences of WTGs in very close proximity to electricity lines, and to the long-term issues for electricity lines and network operators as a result of having WTGs in close proximity. Implications for line maintenance are discussed and the need to ensure the security of strategic transmission corridors is presented.