There is growing interest in understanding how electricity rate design can influence systems-level outcomes, including emissions, technology adoption, and costs. This analysis pairs EPRI’s rate benchmarking database and U.S. Regional Economy, Greenhouse Gas, and Energy Model (US-REGEN) energy systems model to assess how alternative residential retail rate designs with different volumetric rates and fixed charges can shape electricity demand, generation mix, and emissions across U.S. regions. Model results suggest that higher fixed charges lower marginal (volumetric) prices, boosting residential electricity use, especially in buildings, while dampening rooftop solar deployment and better aligning revenues with underlying system cost drivers. Emissions outcomes are driven more by emissions policy stringency than by rate design across the scenarios investigated here, though rate design influences near-term emissions via changes in load and resource mix. Results exhibit strong regional heterogeneity, with the largest price and demand responses in high-cost regions in the Northeast and California.