In the years Apoorv Garg worked at Tesla, he tanked up on Elon Musk’s carbon creed. To the extent that when he moved back to India five years ago, he couldn’t shake off the belief that “carbon and energy will drive future progress”.

The oil shock induced by the war in West Asia may have sent governments scrambling to provision for fossil-fuel alternatives, but Garg and his co-founder, Yugal Raj Jain, are emerging from their biomass bet more prepared than ever.

India produces the same amount, roughly 1,000 million tonnes, of biomass and coal every year, but........

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