Chapter 1
Diagram 1-1: The Three Grids of North America
Diagram 1-2: A Grid in Your Home
Diagram 1-3: An Early Electric System
Diagram 1-4: A Slightly Improved System
Diagram 1-5: Early Electric System Tie-Lines
Diagram 1-6: Radial Electric System
Diagram 1-7: Network Electric System
Diagram 1-8: Alternating Current
Diagram 1-9: Direct Current Tie-Lines between Grids
Diagram 1-10: Water Barrel Analogy for the Grid
Diagram 1-11: Transformers Allow the Grid to Connect Together
Diagram 1-12: The Three Phases of Alternating Current
Diagram 1-13: Three-Phase Transmission Line
Chapter 2
Diagram 2-1: Balancing Generation and Load
Diagram 2-2: Contract Path vs. Actual Flows
Chapter 5
Diagram 5-1: Load for a Typical Summer Peak Day
Diagram 5-2: Load for a Typical Winter Peak Day