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The use of incentive regulation and other alternative regulatory programs in U.S. electricity markets has grown during the past two decades. Within a stochastic frontier framework, I investigate the effect of individual programs on the technical efficiency of a large set of coal and natural gas generation units. I find that those programs tied directly to generator performance and those that modify traditional fuel cost pass-through programs, to provide a greater incentive to reduce fuel costs, are associated with greater efficiency levels. Other programs have no statistical association with efficiency levels.