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Unaudited Quarterly Financial Information
12 Months Ended
Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Financial Information
24. Unaudited Quarterly Financial Information

A summary of the unaudited quarterly results of operations for the years 2020 and 2019 follows.  This summary should be read in conjunction with the audited consolidated financial statements appearing herein.  Results for interim periods may fluctuate as a result of seasonal weather conditions, changes in rates, and other factors.
Unaudited Quarterly Financial Information
2020
 FirstSecondThirdFourthTotal
Operating revenues$2,578 $2,521 $2,251 $2,899 $10,249 
Operating expenses2,046 1,914 1,716 1,862 7,538 
Operating income532 607 535 1,037 2,711 
Net income (loss)192 255 205 700 1,352 
Unaudited Quarterly Financial Information
2019
 FirstSecondThirdFourthTotal
Operating revenues$2,725 $2,750 $2,604 $3,239 $11,318 
Operating expenses1,960 2,158 2,088 2,301 8,507 
Operating income765 592 516 938 2,811 
Net income (loss)423 241 165 588 1,417