(1) Each electric utility shall submit to the commission on or before March 1 of each year an annual reliability report for the previous calendar year for the Montana jurisdiction.  The report shall include the following information:

(a)  aggregate system reliability performance, comprised of customer average interruption duration index, system average interruption duration index, and system average interruption frequency index for the previous calendar year for the Montana service territory and each defined Montana operating area.  These indices shall be calculated twice, once with the data associated with major events and once without. This assessment should contain tabular and graphical presentations of the trend for each index as well as the trends of the major causes of interruptions; and

(b)  the customer average interruption duration index, system average interruption duration index, and system average interruption frequency index reliability average values for the previous three calendar years for the Montana service territory and each defined Montana operating area.  These average values shall be calculated twice, once with the data associated with major events and once without.