567—21.6 (455B) Temporary electricity generation for disaster situations. An electric utility may operate generators at an electric utility substation with a total combined capacity not to exceed 2 megawatts in capacity for a period of not longer than 10 calendar days and only for the purpose of providing electricity generation in the event of a sudden and unforeseen disaster that has disabled standard transmission of electricity to the public. Department approval shall be required if the electric utility intends to operate generators for a period longer than 10 calendar days. The electric utility shall provide an oral report to the appropriate department field office and to the department's air quality bureau and shall specify the anticipated duration within eight hours of commencing use of a generator or at the start of the first working day following the placement of a generator at each site. A written report shall be submitted to the department within 30 calendar days following the cessation of use of the generators. The written report shall state the nature of the sudden and unforeseen disaster, the location of each site, the number of generators used, the capacity of the generators used, the fuel type of the generators, and the duration of use of each generator. For purposes of this rule, the definition of “disaster” shall be as defined in Iowa Code section 29C.2(1), and a disaster may occur before, with, or without a gubernatorial or federal disaster proclamation.