Mitsubishi Heavy Industries, Ltd. and MHI Environmental & Chemical Engineering Co., Ltd., together with the City of Yokohama and Tokyo Gas Co., Ltd., started a demonstration test of the carbon dioxide capture and utilization (CCU) process, in which CO2 is separated and captured from the flue gas of the Tsurumi waste-to-energy plant of the Resources & Waste Recycling Bureau, Yokohama City, and then used as a resource. The captured CO2 is transported to a different demand location, where it is subject to methanation. This CCU demonstration project based on regional cooperation is Japan's first of its kind. The project purpose and overview are presented in this report.