Hardening the System - Undergrounding - 1 views
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Though mostly immune to wind-related damage, undergrounding facilities are prone to flooding. Undergrounding also presents significant challenges, namely longer repair time and much higher repair costs; damage to underground facilities from Sandy reinforced that. Investor-owned utilities in North Carolina compared five years of underground and overhead reliability data and found the frequency of outages on underground systems was 50% less than for overhead systems, but the average duration of an underground outage was 58% longer.