Load Forecast and Base Case Development 1

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6 Substation Transformer Loading (STL) Program – Data repository – Monthly actual peaks/energy – Load projections – Growth rates

Populating the database – STL – Non-coincident values Forecast data “Fitting” the load – Conforming vs. Non-conforming – ‘Scrunch’ factor Load Forecast and Base Case Development 7

Load level assumptions (e.g., System load) (SUM / WIN) – Historical o 1-in-2(2014 = 1650 / 1582 MW) – Proposed o 1-in-10(2014 = 1673 / 1615 MW) – Scenarios: o 1-in-20(2014 = 1679 / 1624 MW) o 1-in-50(2014 = 1687 / 1635 MW) Load Forecast and Base Case Development 8