Build-a-Lot 4: Power Source:Help friendly towns to grow and glow by building neighborhoods and generating clean energy to make them run in this exciting Time Management game. Watch out for power overload! If you build too fast, you may experience blackouts and unhappy renters. Build solar towers, wind farms, and dispatch technicians to make sure everyone is energy efficient. Make your neighborhoods fit and fancy by building tennis courts, swimming pools, boutiques and more in Build-a-lot 4: Power Source.