This report documents the methodology of and key findings from applying abatement cost curves and scenarios to set low-carbon targets and define cost-effective low-carbon investment programs in Changning district, Shanghai. The team supported a Shanghai energy conservation institution in conducting a survey of buildings in Hongqiao area in the changning district, and in developing carbon dioxide (CO2) abatement cost curves to identify the abatement potential, cost, and ease of implementation of various mitigation measures. Three alternative abatement scenarios were developed to establish an ambitious low-carbon target for Hongqiao area. The use of CO2 abatement cost curves, bottom-up investigation surveys, and ease-of-implementation considerations for defining an investment program to reduce CO2 emissions were the first of its kind at the time. The abatement cost curve developed under this upstream analytical work allowed the district government to make informed decisions about medium-term targets for CO2 abatement and to identify priority actions and investments to meet them.