**5. Conclusions**

The comparative analysis of several review papers and technical reports show that a large number of technologies were already proposed decades ago, before the catastrophic ice storms of 1998 in Eastern Canada and 2008 in central and southern China. The intense work within research institutions as well as utilities in the wake of these events led to the increase in the understanding of the meteorological phenomena and their impacts on the power grids. Rather than finding new technologies, efforts have been focused on developing already known countermeasures with the potential for practical application in field operations.

There is no single trend for the deployment of anti-icing or de-icing technologies around the world. Passive, thermal, and mechanical methods are used by utilities in various regions of the world, depending on their local needs and their local experiences in the past. Additionally, the recommendations for future applications are diverse. Regarding the construction of new lines or the reconstruction of damaged lines, several lessons have been learned since the catastrophic events in 1998 and 2008 and actions are taken today to improve the line design.

Once one or several anti-icing or de-icing methods have been selected for the integration into field operations, several years may pass before the deployment is accomplished. This should be considered in the deployment strategies.
