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- Coal billionaire Gautam Adani is building the world's largest power plant, and it's all renewable.
- Adani's nephew, who's in charge of the project, says there's "no choice" but to go big on green energy.
- Still, the Adani Group makes 62% of its revenue from fossil fuel.
The largest power plant in the world is under construction, and it'll produce enough clean energy to fuel entire countries like Belgium, Chile, or Switzerland.
It will cover 200 square miles — nearly the size of Chicago.