Storage Methodology
Alternative energy sources, especially wind and photovoltaic, are intermittent in nature and add to the complexity of managing the fluctuations in energy consumption. Energy which is inexpensively stored and easily retrieved bolsters baseline production and reduces peak demand purchases. Such reserves can also be brought online quickly to offset interruptions in production or distribution.

Gravity and Water

Hydroelectric plants flatten load curves by pumping water to elevated reservoirs and  releasing this potential energy at times of increased load.
Today, pumped-storage hydroelectricity is the largest-capacity form of grid energy storage available.

Compressed Air

Relatively low efficiency Compressed Air Energy Storage (CAES) costs roughly $1000 per kilowatt of storage as opposed to $3000 per kilowatt for battery storage.
Similarly, aquifer storage sequesters this energy in porous sandstone instead of salt domes or abandoned mines.

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Driven solely by the sun, Drake Landing’s borehole thermal energy storage system supplies 90% of the space heating and hot water needs for the 52 homes in this trend-setting development in Alberta, Canada.

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