Customers expect highly reliable electric service, and Duke Energy delivers. Each year we set power delivery reliability targets for the number and duration of power outages, and generation fleet performance targets.
Mid-size storm activity in the Carolinas during July and August (a 1-in-100 year event) caused us to miss our targets for outage frequency and duration. Despite the results in 2016, our long-term trend in outage frequency continues to improve while our long-term trend in outage duration remains stable.
Our diverse generation fleet including fossil, nuclear, hydro, wind and solar resources reliably met challenging demands, despite a summertime record for usage in the Carolinas.
Nuclear fleet capacity factor, which is a measure of generation reliability, exceeded 90 percent for the 18th consecutive year, and improved from 94.2 percent in 2015 to 95.7 percent in 2016. The fossil fleet’s commercial availability declined from 87.4 percent in 2015 to 84.7 percent in 2016. The commercial renewables fleet’s commercial availability increased from 93.3 percent in 2015 to 94.2 percent in 2016 because of reduced unscheduled maintenance activities.