Calculating greenhouse gas emissions reductions from projects requires construction of a hypothetical baseline that approximates emissions levels without the project. This paper describes a standardized multi-project baseline methodology for industrial energy-efficiency and electric power projects. The multi-project baseline methodology is illustrated with four case studies. Two case studies, for Brazil and China, focus on energy-efficiency projects in the cement sector. The other two case studies focus on electric power sector projects in India and South Africa. From the four case studies, it is clear that the most difficult aspect of setting multiproject baselines is determining the appropriate criteria in terms of baseline plants, baseline breadth, and baseline stringency in order to balance the desire to encourage no- or low-carbon projects while maintaining environmental integrity. Overall, we found that it is important to fully evaluate the variety of potential baselines in order to make informed decisions regarding which plants to include in the baseline, what type of baseline to use, and what level of stringency to use. Further research is required to fully understand the ramifications of the various choices in constructing and using these baselines. Keywords: baselines, industrial energy.