Electric Grid Overview the Flow of Electricity

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Electric Grid Overview The flow of electricity PG&E’s electric grid is designed to deliver safe, reliable energy to customers throughout our service area. 2013 electric power mix delivered to retail customers 10% Hydroelectric 22% Renewable 18% Unspecified 28% Natural Gas 22% Nuclear *“Unspecified Power” refers to electricity generated that is not traceable to specific generation sources by any auditable contract trail. **These figures are preliminary and will not be finalized until verified by the California Energy Commission. Transmission Power Generation Substations Transmission Lines Electricity is generated by a diverse Transmission substations convert Transmission lines are connected to mix of sources, including renewable, electricity to high voltages, so it can substations and move high-voltage hydroelectric and nuclear. It flows from be efficiently carried over long electricity in bulk from power plants to the power plant where it is generated distances. They can also serve as distribution substations. onto the electric grid through a the connection point between different transmission substation. transmission lines. Homes and Distribution Businesses Distribution Lines Substations Electricity is then used by the 16 Distribution lines carry electricity at Distribution substations connect million people we serve in California lower voltages and deliver it to homes transmission lines to distribution lines. to power their homes and businesses. and businesses. These substations lower the voltage of Customers with solar or renewable en- electricity, so it can be safely delivered ergy systems also put electricity back to homes and businesses. onto the local power grid. In fact, we have helped customers connect more solar systems to the local power grid than any other utility in the country. Learn more at pge.com/northernsanjoaquinpc or by calling 1-888-743-1175 or emailing [email protected]. "PG&E" refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation. ©2015 Pacific Gas and Electric Company. All rights reserved. .

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