Non-renewable resources are energy sources that are in limited supply. On the other hand, renewable resources are sources that can be easily replaced. Wind energy is one such example. Since wind is abundant, harnessing wind is an effective strategy for using renewable resources. Hydroelectric power is energy produced from moving water. The idea of using renewable energy is not a new idea. Energy was harnessed from steam as early as the 1800s and became the most efficient source of boat power.