The era of renewable resources and alternative energy has arrived. It’s cheaper now than ever before to generate electricity from solar, wind, hydropower and other examples of renewable resources, catapulting them from fringe options to the fastest-growing energy resources in the country. In 2017, renewables set a record in the U.S. by generating 15% of all electricity, predominantly due to hydropower, solar and wind. What are some other examples of renewable energy? We’ll go down the list.