This table represents the summer power-generating capacity by energy source in the United States as of July 2016.

Energy Source                    Percentage
Coal....................................................26.0
Hydro...................................................7.5
Natural gas........................................42.0
Nuclear................................................9.0
Solar.....................................................1.5
Wind.....................................................7.0
Other....................................................7.0

What conclusions can you reach about the source of energy in July 2016?