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Confidential - For Internal Use Only Gen Drop Addition Mount Signal Solar (DREW GEN 4) A new 250 MW Solar (DREW GEN 4) facility will be interconnected via a shared 230kV line at DREW (DW) Substation Through logic additions in the SEL-2411 RAS relays at existing DREW GEN 2, Gen Drop at Mount Signal Solar (DW GEN 4) will be added to the following RAS: TL50001 – Instantaneous trip (Enabled during N-1 operation) – WAPS TL50003 – Instantaneous trip (Enabled during N-1 operation) – WAPS TL50004 – Instantaneous trip (Enabled during N-1 operation) – WAPS TL50005 – Instantaneous trip (Enabled during N-1 operation) – WAPS TL23040 IV 500kV N-1 – Instantaneous trip (Normally enabled) – WAPS Imperial Valley Bank 80 – Sequential trip (Enabled during N-1 operation) – LAPS Miguel Bank 80/81 – Sequential trip (Enabled during N-1 operation) – LAPS Confidential - For Internal Use Only

DREW GEN 4 is connected via TL23067 to the 230kV Bus at DREW Gen Drop Addition Mount Signal Solar (DREW GEN 4) OCO GEN OCOTILLO TL50003 DREW GEN 4 is connected via TL23067 to the 230kV Bus at DREW SUNCREST SYCAMORE CANYON TL50005 TL50004 TL50001 TL50002 NG MIGUEL DW GEN 1 ECO BK 83 IV BK 81 BK 80 BK 81 BK 82 TL23067 BK 62 DREW 230KV ECO GEN 1 IVS IV 230kV Bus OTAY MESA DW GEN 2 DW GEN 4 ECO GEN 2 BUE IV PST TJ ROA TDM CLR2 IV GEN 3 DU DW GEN 3 Confidential - For Internal Use Only

Confidential - For Internal Use Only Gen Drop Addition Mount Signal Solar (DREW GEN 4) Existing RAS can trip the following generation: 1200 MW combined cycle (CLR2, TDM) 720 MW solar (DW1, DW2, DW3, IV GEN 3, DU) 550 MW wind (OCO, BUE1, ECO GEN) Total of 2470 MW DW GEN 4 will add 250 MW gen drop capability Confidential - For Internal Use Only

Confidential - For Internal Use Only Gen Drop Addition Mount Signal Solar (DREW GEN 4) DREW GEN 4 Substation (2) 230/34.5kV transformers (5) 34.5kV feeders Sequential trip operates lockout relay on 3-second delay All other RAS trips are instantaneous Confidential - For Internal Use Only

Confidential - For Internal Use Only Gen Drop Addition Mount Signal Solar (DREW GEN 4) Confidential - For Internal Use Only

Confidential - For Internal Use Only Gen Drop Addition Mount Signal Solar (DREW GEN 4) Confidential - For Internal Use Only

Confidential - For Internal Use Only Questions? Confidential - For Internal Use Only