NEWS & TECHNOLOGY FOR THE GLOBAL ENERGY INDUSTRY SINCE 1882 Vol. 165 * No. 4 * April 2021 Page 18 O&G Majors Shifting to Renewables, Hydrogen, and CCS | 24 Understanding Hydro Turbine Draft Tubes | 28 An Innovative Non-Chemical Cooling Water Treatment System | 32 Fuel Cell Primer | 34