EXCERPT FROM THE INTRODUCTION
This technical support document (TSD) describes two illustrative calculation-based approaches for translating the Clean Power Plan (CPP) emission rate-based goals to a mass-based equivalent. These approaches should be viewed as two potential ways in which implementing authorities may wish to translate the form of the goal to a mass-based equivalent. The first approach produces mass-based equivalents that apply to existing affected fossil fuel-fired sources only. In light of the fact that the CPP takes comment on the inclusion of new, fossil fuel- fired sources as a component of state plans, the second approach produces mass equivalents that are inclusive of emissions from existing affected and new fossil fuel-fired sources.