Indian billionaire Gautam Adani, one of Asia’s richest men, may be facing his biggest challenge yet with an indictment by U.S. prosecutors for alleged fraud and bribery. But it’s unclear just how the case will affect his businesses and own future — as well as the Indian economy and government.

Authorities said Adani and seven other defendants, including his nephew, agreed to pay about $265 million in bribes to Indian government officials to obtain solar energy supply contracts expected to yield billions in profit.

A US indictment threatens Indian tycoon Gautam Adani’s efforts to redefine himself as a clean-power champion and secure overseas financing for projects vital to the nation’s energy transition.