The past year has brought plenty of changes in the energy regulatory landscape, particularly in relation to climate change and carbon dioxide (CO2) emissions. Accounting for the resulting costs of these and other policies by incorporating a CO2 price is now firmly in the realm of best practice for utilities and system operators engaged in long-term energy planning. To assist with such planning and to provide a resource for other stakeholders, Synapse’s CO2 price forecasts simplify the complex process of determining effective CO2 prices by combining our own modeling results with comprehensive analysis of other CO2 prices in use throughout the electricity sector.