Ice Assessment

Persimia conducted an ice assessment of the Neosho Ridge Wind project, which is available here.

Persimia was founded by two highly experienced and internationally recognized Georgia Tech professors with extensive expertise in aerodynamic modeling, multi-physics simulation, and probabilistic analysis. They have developed some state-of-the-art simulation tools to provide high-value environmental impact assessment for permitting authorities and surrounding communities.

To quickly summarize the key findings of their analysis:

  • Wind farm operators follow several operational procedures to ensure that the turbines are shut down in icing and/or thawing conditions to protect against ice throw events. These management practices are expected to reduce incidents of ice throw significantly, converting most of it to ice fall, which decreases the impact risk to receptors to essentially zero for all receptors.
  • Even in the case that the operational procedures designed to protect against ice throw are not completely effective, and all ice is shed through ice throw events rather than ice fall, the ice fragment impact risk to receptors surrounding the Neosho Ridge site is very low. For the 367 receptors located within 4,921 ft of a turbine, the average number of expected ice fragments is approximately one fragment in 200 years.
  • Furthermore, the mass of the average ice fragment shed from a turbine is only 1.3 lbs, with the vast majority of fragments having a mass less than 2.2 lbs. These are NOT large fragments of ice.
  • Overall, simulation results show that ice fall poses no risk to homes and buildings in the area surrounding Neosho Ridge, due to the limited travel distance of the ice pieces.