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Solar Eclipse August 2017 LADWP Impact & Preliminary Plan

Solar Eclipse August 2017 LADWP Impact & Preliminary Plan. ~5500MW peak load (high assumption) ~5530MW Thermal Gen ( Incl ~800MW quick start/fast ramp capable) ~2030MW Hydro Gen (Most units quick start/fast ramp capable) 440MW Wind Gen ~1240MW Solar Gen

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Solar Eclipse August 2017 LADWP Impact & Preliminary Plan

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  1. Solar Eclipse August 2017LADWP Impact & Preliminary Plan

  2. ~5500MW peak load (high assumption) ~5530MW Thermal Gen (Incl ~800MW quick start/fast ramp capable) ~2030MW Hydro Gen (Most units quick start/fast ramp capable) 440MW Wind Gen ~1240MW Solar Gen (incl ~230MW behind the meter estimate)

  3. ~ 1240MW Total Solar Gen (%obscuration & times from https://eclipse2017.nasa.gov/eclipse-maps) • ~230MW Behind the Meter in LA area (estimate) • ~60% obscuration • 0905-1144hrs, 1021hrs max • ~15MW Apple Valley area • ~65% obscuration • 0906-1147hrs, 1022hrs max • ~490MW Mojave/Tehachapi area • ~65% obscuration • 0905-1145hrs, 1021hrs max • ~500MW Las Vegas area • ~70% obscuration • 0909-1153hrs, 1027hrs max

  4. LADWP is still in process of determining • Expected Solar gen drop • Max magnitude • Ramp rate down and up

  5. LADWP Total Solar Trend Late August 2016 • about double the Solar Gen this August

  6. LADWP Load Trend, same day as above

  7. We expect to use same operating principles used during cloudy days. • Carry additional reserves for expected gen drop • Have sufficient ramp capability to keep up with both • Solar Gen drop ramp down • Rising Load curve

  8. LADWP will minimize outages/de-rates on fast ramping generation resources. Note: If insufficient fast moving gen online/available to keep up with ramp of simultaneous solar drop & load increase, LA may choose to pre-emptively curtail Solar gen to expected output during max obscuration.

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