1) Washington D.C., United States
2) New Delhi, India
3) Abu Dhabi, United Arab Emirates (UAE)
4) Geneva, Switzerland
Explanation:
The 24th Edition of World Energy Congress (WEC) for 2019 was held from September 9-12, 2019 at the Abu Dhabi National Exhibition Centre (ADNEC), in Abu Dhabi, United Arab Emirates (UAE).