Ohio-based utility AEP is one of the most advanced in using storage to buffer energy on the grid. Here, a sulfur-sodium battery from NGK Insulators is installed at a substation. It provides back-up power and holds enough energy to supply the local grid during peak times. Each megawatt battery can hold about 7.2 megawatt-hours.
September 17, 2010 4:00 AM PDT
Photo by: AEP
| Caption by: Martin LaMonica
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