Electrical Distribution System Basics Normal Electrical Utility Operation

Ø Electrical Distribution System Basics Ø Normal Electrical Utility Operation Ø Normal and Standby Power Ø Emergency Power Operations Ø Backup Power Operations

BASIC ELECTRICAL DISTRIBUTION SYSTEM CPS EWEB UO Substation Combustion Turbine Generator Feeders 1 2 3 4 9 10 11 S 2 Feeder Breakers Emergency Diesel Generators SWITCH HOUSE

CPS EWEB Power Supply EWEB UO Substation Combustion Turbine Generator Feeders 1 2 3 4 9 10 11 S 2 Feeder Breakers Emergency Diesel Generators SWITCH HOUSE 13 MW

CPS Emergency Diesel Generator Operation Feeders 1 2 3 6. 5 MW 4 9 10 11 S 2 Feeder Breakers Emergency Diesel Generators SWITCH HOUSE 50%-65%

CPS Island Mode Operations Feeders 1 Combustion Turbine Generator 2 3 13. 5 MW 4 9 10 11 S 2 Feeder Breakers Emergency Diesel Generators SWITCH HOUSE 100%

FEEDER SYSTEM BASICS • Radial Feed System Switch House Breaker • Individual Building Breakers are manually operated locally at building Clinical Services • One single main feeder breaker at switch house • When a feeder is energized, all loads are energized until building breakers are operated Condon Education Hedco N/E Mc. Kenzie PLC

Feeders 1, 2, 3, 4, 9, 10, 11 Feeder Breaker Transformer Standby Feeders Transformer Feeder Breaker

• Fire Protection • Life Safety Circuits • 100% Building Power • Designated Critical Circuits • Does NOT substitute for Feeders 1 -11 * *University Health, Zebrafish and Various CPFM Buildings 100% on Standby Feeders 1, 2, 3, 4, 9, 10, 11 Normal Feeder Breaker Transformer Standby Feeders Transformer Standby Feeder Breaker

Electrical Power ELECTRICAL OPERATIONAL PHASES Natural Gas Not Available 0 MW Life Support 1 MW Intermittent Use of Diesel Generators Requires Prioritization of Standby Loads and Life Safety Max Fuel Endurance 42 days Phase 1 Standby & Life Safety Phase 2 1 Diesel Generator All Life Safety and All Standby Power 21 days 2 MW Partial Operations Phase 3 2 -3 Diesel Generators Prioritize Non-Essential Loads and Services 7 days Natural Gas Available 6 MW Island Full Power Phase 4 CPS Provides Electrical Power for Normal Business Operations. 15 MW EWEB Full Power 15 MW Phase 5 EWEB Provides Electrical Power for Normal Business Operations 2. 6 days No Natural Gas

BASIC ELECTRICAL DISTRIBUTION SYSTEM CPS EWEB UO Substation Combustion Turbine Generator 1 2 3 4 9 10 11 S 2 SWITCH HOUSE Emergency Diesel Generators