This rule was proposed by the Commission on 04/15/2012. On 08/01/2012, a change of proposed rule was filed. Changes were based upon the consideration of comments received on the initial version of the rule and the desire to incorporate the 05/21/2012 version of Standard IEEE 1366-2012 Guide for Electric Power Distribution Reliability Indices (which was published after the initial 05/15/2012 filing deadline for the proposed rule) as the foundation for the rule. The changes provided more flexibility for an electric corporation to develop, manage, and revise its electric service reliability program while requiring the electric corporation to meet Commission-approved levels of reliability. When the rule was amended on 12/20/2012, Rocky Mountain Power recommended to replace the requirement for an electric corporation to report Momentary Average Interruption Frequency Index (MAIFI) data with the requirement to report Momentary Average Interruption Frequency Index Event (MAIFIe) data, to clarify reporting requirements for MAIFIe data and to make other minor changes. As proposed by Rocky Mountain Power, the impact of momentary electric service interruption experienced by a customer is related to the entire momentary event (as represented by MAIFIe) rather than the electric system's attempts to automatically restore power after a fault event (as represented by MAIFI). Therefore, the electric service reliability rules addressing momentary outages should reference MAIFIe not MAIFI.