Abstract
Recent climate regulations include increased utilization of natural gas-fired combined cycle (NGCC) generators as a means for offsetting coal generation to reduce carbon emissions. There have been substantial increases in utilization for some generators, but most remain below baseload levels. This paper examines the factors that have driven NGCC utilization from 2003-2014. I run difference-in-dif-ference models to evaluate the relationships between environmental policies and natural gas prices on NGCC utilization. Both low natural gas prices and the Clean Air Interstate Rule (CAIR) drive increases in utilization. However, the size of the impact by CAIR depends on the age of the plant. I use the estimates from this model for a counterfactual analysis which reveals CAIR had nearly twice the impact of low natural gas prices on increased utilization in nationwide averages.
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