More than a dozen towns will be part of a new vegetation management program from Eversource, aimed at removal of trees within a targeted “fall zone” on over 700 properties.  Among the 15 segments of the electric system identified using historical data susceptible to outages are Newtown, Redding, and Sharon.  Eversource vegetation management crews assess whether to trim tree limbs that encroach upon the company’s distribution network and this fall zone is a broader area than before.  To determine the problem areas, Eversource looked at types of outages over a five-year period and then instances over a 10-year-period in which outages were due to weather-related conditions.  Eversource officials say trees cause 90 percent of power outages during storms and severe weather.