In an extensive 313-page report, federal regulators have concluded that natural gas-fired generators made up 58% of all unplanned outages, derates or failures to start during the deadly cold weather event in February.

The remaining portion of outages was by wind (27%), coal (6%), solar (2%) and other generation types (7%), according to the final report prepared by FERC, the North American Electric Reliability Corp. (NERC) and the six regional entities that make up the organization. Four nuclear units made up less than 1% of the outages, derates and failures to start during Winter Storm Uri.

“The final report on Winter Storm Uri is a sobering analysis that highlights the significant work that needs to be done,” said Federal Energy Regulatory Commission Chairman Richard Glick....