Greenko Energy Holdings, one of the largest clean energy companies in the country, is set to prepay a tranche of $500 million of its dollar bonds that would mature in August this year using its near-term cash flows, people familiar with the matter told ET. The company clocked $625 million in Ebitda (operating profit) in FY22 and is expected to close fiscal year 2023 at $650 million on revenues of $720 million.