Against the backdrop of accelerating energy transition across the world, there is an urgent need to achieve carbon neutrality in Gas Turbine Combined Cycle and steam power generation systems, which are the main products of Mitsubishi Heavy Industries, Ltd. Decarbonization of these thermal power generation systems necessitates developing not only decarbonization technologies for power generation facilities but also technologies to produce hydrogen, which is considered to be one of the fuels for such decarbonized power generation, economically and in large quantities. MHI is developing both power generation facilities and hydrogen production systems, and the previous report focused on hydrogen production technology and introduced the features and development status of the technology. This report presents the progress made since then.