Seven of the world’s 10 largest and busiest container ports are located in China. These booming ports serve as the engines of China’s economic growth. This report, as part of CEF's Choke Point: Port Cities initiative, develops an emissions inventory for container ships at the Port of Shenzhen, examines the life cycle emissions savings from using onshore power to supplant diesel consumption from ships, calculates the cost effectiveness of onshore power, and compares the results to the cost effectiveness of using fuel switching that can achieve smaller, yet significant, emissions reductions.