India's clean energy sector is expected to attract additional investments worth USD 1 billion (Rs 6,987 crore) during the renewable energy expo in Greater Noida next month, an official said today. The Renewable Energy India (REI) 2018 will be organised by B2B events organiser UBM India from September 18 to 20. "We are expecting that an additional investment of USD 1 billion would come in the renewable energy space in the country due to REI 2018," said UBM India MD Yogesh Mudras here at curtain raiser press meet.