World 5 · Keep the Lights On · 12 min · PRO

Supply = demand

Frequency balancing

PRO · Energy Island

World 5: Keep the Lights On is part of PRO

The first world of Energy Island is free. PRO opens the other 20 lessons in 5 worlds — simulations, quizzes and all.

A day of demand
The duck curve
Plan a reliable island
What does a kilowatt-hour cost?
Carbon per kilowatt-hour

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