The cost of wind power has fallen by two - thirds since 2009, making wind cost - competitive with other energy sources. (windsystemsmag.com)
Solar energy can have a positive, indirect effect on the environment when using solar energy replaces or reduces the use of other energy sources that have larger effects on the environment. (eia.gov)
Even more promising is the potential to use the lithium battery to store power from other energy sources like solar and wind. (greenbackd.com)