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New and improved grid-scale energy storage technologies are gaining popularity.

Pumped hydro storage is efficient, but installations are expensive and time-consuming to build.

Lithium-ion batteries are common in small applications, but building large-scale lithium-ions remains prohibitively expensive.

Ultracapacitors and flow batteries have their niche uses.

And some cutting-edge solutions aggregate many small amounts of storage, whether from electric vehicle batters, uninterruptible power supplies, or the thermal storage embodied in water heaters.

EnergyStorageTechnology.com 2012