CAES systems use off-peak electricity to compress and store air into underground mines or caverns. Relatively low-cost storage caverns can be obtained from natural salt deposits by injecting large amounts of water to dissolve the salt
BENEFITS-COST-POLICIES: Wind, solar and hydropower produce little or no air pollution. Technologies, such as biomass and geothermal, air pollutants, but at much lower rates than most conventional fuels.
