6.1a ERMUSR 08-14-2018 - Laserfiche WebLink

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provides all of the demand to these two members that is not supplied by WAPA. This IRP assumes that WAPA allocations remain at the current contract amounts throughout the projection period. The Effect of Electric In Section 4, it was discussed that MMPA's energy requirements Vehicles on Peak would increase with an increase in electric vehicle use. However, Demand is Unclear the effect of electric vehicle use on demand is unclear. The California Energy Commission (CEC) report discussed in Section 4 estimated electric vehicles in California could add more than 1 GW of peak demand by 2025, assuming California reaches its goal of 1.5 million zero-emission vehicles (approximately 5% of all vehicles). The report described an electric vehicle charging profile consisting of a small at-home charging load ramp in the morning, work-place charging during the day, and a steep at-home charging load ramp in the early evening. This charging profile would likely increase peak demand. However, an alternative electric vehicle charging profile, where the majority of charging occurs during overnight off-peak hours, may have limited impact on peak demand. This IRP assumes no increase in demand requirements during the projection period because the level of electric vehicle penetration and the effect of electric vehicles on peak demand is not clear. Higher MISO Historically, MISO's planning reserve margin(PRM) has varied by Planning Reserve planning year as shown in the chart below. This IRP uses a PRM of Margin (PRM) 8.4%, consistent with the most recent planning year, to calculate Would Increase MMPA's planning resource margin requirements(PRMR). Future Capacity increases in PRM would increase MMPA's capacity requirements. Requirements MISO Planning Reserve Margin 10.0% 9.0% 8.0% �,—"�♦ 7.0% 6.0% c 5.0% a 4.0% 3.0% 2.0% 1.0% 0.0% 2013 2014 2015 2016 2017 2018 92