Georgia Power has until mid-January to provide state utility regulators with a detailed explanation of how an underground electrical fire darkened Atlanta's Hartsfield-Jackson International Airport for 11 hours on Dec. 17, sparking a disruptive domino effect across the international air traffic system.

佐治亚州公共安全委员会提出了20个问题，以确定导致火焰的确切事件序列，格鲁吉亚电力所说的佐治亚州授权所说的佐治亚州的开发器的失败，位于地下电气设施中。由于火灾发生在冗余电路电缆和切换机构附近，因此机场的电气系统无法切换到替代电源馈送。

A joint investigation by Atlanta firefighters and federal agencies found no evidence of unauthorized activity associated with the incident.

Along with questioning Georgia Power about future preventative measures, the commission also is asking whether a microgrid could have minimized the fire's effects. Several major U.S. surface transit systems currently are developing or investigating alternative power supply and storage systems to preserve operations in the event of a major grid disruption; yet, only a handful of small airports have or are considering incorporating microgrids.

Georgia Power's owner, Southern Co., completed a $461-million purchase of Wake Forest, N.C.-based microgrid technology specialist PowerSecure in May 2016. A commission spokesperson says Georgia Power's responses will be made public, unless those responses include trade secrets. After reviewing the responses, agency staff will determine whether to make recommendations to the commissioners or request additional information.