Comparison of perch deflection, conductor separation and insulation methods at reducing avian electrocutions at an electricity distribution line in Mongolia

We report persistent high rates of raptor electrocution, particularly of Saker Falcons (Falco cherrug), in the Mongolian steppe grasslands. In 2018–2019, we conducted a trial to compare the efficacy of five mitigation techniques to reduce avian electrocutions at a 15 kV 3-phase power distribution line in Mongolia with a history of consistently high electrocution rates. All five techniques significantly reduced electrocution rates in comparison to controls with no mitigation. At phase 1 on the pole top, we found no significant difference in the efficacy of conductor insulation, arch-type pin-insulator mounts and the use of two pin-insulators as a means of deflecting birds from dangerous perch sites. At phases 2 and 3 on the crossarm, we found no significant difference in the efficacy of conductor insulation and the use of suspended insulators. We discuss the utility of insulation methods and pole hardware reconfiguration for retrospective mitigation of dangerous power poles that pose an avian electrocution risk.