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The economic viability of many U.S. nuclear plants has been deteriorating rapidly since 2010. To save in-state, zero-emission baseload generation, several states have passed zero-emission credits to subsidize their economically challenged plants. Our power market dispatch modeling, however, suggests that keeping nuclear plants online does not necessarily mean a reduction in carbon emissions within the region or state, as the amount of regional emissions also depends on grid characteristics and the evolution of the generation fuel mix.