World 5 · Keep the Lights On · 10 min · PRO
A day of demand
Shapes of electricity use
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.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly