A deal by Adani Green Energy to provide solar power that is already subject to a US bribery investigation, faces a further challenge as its main buyer, the southern state of Andhra Pradesh, has asked for guarantees that transmission charges will be waived, three sources with knowledge of the matter said.

The transmission fee, which could increase the cost of the solar power by around 40 per cent, is mandated by federal law, meaning waiving it would be problematic.

Since April, Adani, which is part of a conglomerate run by one of India's richest men, has sent many letters urging Andhra Pradesh to begin offtaking power under a 2021 deal, the three sources said.

The deal for 7,000 megawatts of solar power was signed between Andhra Pradesh, Adani Green and the Solar Energy Corporation of In

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