Reliable power is one of Duke Energy’s core commitments to the more than 24 million people we serve. Each year the company sets power delivery reliability targets for the number and duration of power outages, and generation fleet performance targets.
Weather was 40 percent worse (more storms) during the first half of 2017 compared to the previous year, resulting in an increase to Duke Energy’s average time without power of 10 minutes. During the second half of 2017, weather returned to a normal pattern (except for Hurricane Irma), improving average time without power by 3 minutes. The average number of outages remained relatively stable.
Duke Energy’s diverse generation fleet includes carbon-free nuclear, hydro, wind and solar; lower-carbon natural gas; and higher-carbon coal. This fleet reliably met customer demand and recorded another year of great performance during 2017.
Nuclear fleet capacity factor, which is a measure of generation reliability, exceeded 90 percent for the 19th consecutive year, decreasing slightly from 95.7 percent in 2016 to 95.6 percent in 2017. The fossil fleet’s commercial availability increased from 84.7 percent in 2016 to 88 percent in 2017. The commercial renewables fleet's renewables availability increased from 94.2 percent in 2016 to 94.6 percent in 2017.