According to the American Clean Power Association, Indiana made big waves in clean energy during the first quarter of this year. Indiana added the third most solar of any state and quadrupled its battery storage.

Most of Indiana's new battery storage comes from AES Indiana's new 200 megawatt facility at its Petersburg Generating Station in Pike County.

These stand-alone batteries allow utilities to buy energy off the grid when it's cheap and store it for their customers or sell it back to the grid. Because that could be any combination of wind, solar, gas and coal — it's hard to say if the energy stored is particularly green.

"It changes every day, every hour, every month, where that energy comes from," said Mallory Duncan, communications director for AES Indiana.

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