abandoned coal pits that once symbolized environmental concerns now breathing new life as energy storage powerhouses. This isn't science fiction - it's happening right now in places like China's Shandong Province where 40% of existing coal pits are being repurposed for gravity energy storage[6][7]. The global energy storage market, valued at $33 billion[1], is literally digging deeper to find solutions. [2020-08-07 07:05]
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