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This report analyzes electric generation procurement by vertically integrated utilities in the United States, contrasting 'all-source' procurements—which are technology-neutral—with single-source processes. Using case studies from states like Colorado, Georgia, and New Mexico, the authors argue that utilities often exercise monopsony power to favor self-built, gas-fired generation over cheaper renewable alternatives. The report provides five best practices for regulators to ensure fair, competitive, and cost-effective procurement of power plants.