The power to light the world is in your hands in Build-a-lot 4 - Power Source! Help friendly towns to grow and glow by building neighborhoods and generating clean energy to make them run. Watch out for power overload! If you build too fast, you may experience blackouts and unhappy renters. You'll have resources at your command to energize the towns: build solar towers and wind farms, and dispatch technicians to ensure that everyone is energy efficient. Get your neighborhoods fit and fancy by building tennis courts, swimming pools, boutiques and more. With multiple campaigns to play and lots of awards to earn, there's plenty to do in this electrifying addition to the Build-a-lot series!