[The Arizona Republic] ARIZONA - Fire crews tend to massive, smoldering battery in Chandler facility

"The battery is in an approximately 6,000-square-foot building off 56th street south of Loop 202, and used to store electricity for the power grid. It is owned by a company called AES Corp., and it stores energy for Salt River Project"

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https://news.yahoo.com/fire-crews-tend-massive-smoldering-034526911.html